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TZID:Asia/Kolkata
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TZOFFSETFROM:+0530
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250721T090000
DTEND;TZID=Asia/Kolkata:20250725T170000
DTSTAMP:20260417T115644
CREATED:20250401T052629Z
LAST-MODIFIED:20250401T052629Z
UID:10000066-1753088400-1753462800@aero.iisc.ac.in
SUMMARY:CISM-IISc Workshop
DESCRIPTION:CISM-IISc Workshop \non \nEmerging Topics in Architectured & Multiscale Materials\, Soft Robotics\,\nand Data-Driven Model Discovery\nDates: July 21–25\, 2025 \nLocation: Aerospace Engineering Auditorium\, Indian Institute of Science\, Bangalore \nAbout the workshop\n\nThe International Centre for Mechanical Sciences (CISM)\, Italy\, and the Indian Institute of Science (IISc)\, Bangalore\, are delighted to announce their first-ever collaboration with the launch of a Joint Advanced Workshop\, marking the beginning of what is envisioned to be an annual series of events. The inaugural workshop\, titled “Emerging Topics in Architectured & Multiscale Materials\, Soft Robotics\, and Data-Driven Model Discovery\,” will be held at IISc. This pioneering event will convene leading researchers\, graduate students\, and professionals from across the globe to explore the latest advancements in the topic. Featuring expert-led sessions\, interactive discussions\, and networking opportunities\, the workshop is designed to foster innovation\, collaboration\, and knowledge exchange\, laying a robust foundation for future editions. We invite you to join us in this exciting partnership as we collectively shape the future of science and engineering. \nFeatured Discussions: \n\nStatic and Dynamic Properties of Architectured Materials\nMultiscale Modeling Through Magnetic Materials\nSlender Structures and Their Applications in Soft Robotics\nData-Driven Material Modeling\n\nLecturers: \n\nAntonio De Simone (The BioRobotics Institute\, Scuola Superiore Sant’Anna\, Italy and Structural Mechanics\, SISSA)\nLaura De Lorenzis (Department of Mechanical and Process Engineering\, ETH Zürich\, Switzerland)\nDiego Misseroni (Department of Civil\, Environmental\, and Mechanical Engineering\, University of Trento\, Italy)\nAkshay Joshi (Department of Mechanical Engineering\, Indian Institute of Science\, Bangalore\, India)\nRajesh Chaunsali (Department of Aerospace Engineering\, Indian Institute of Science\, Bangalore\, India)\nVivekanand Dabade (Department of Aerospace Engineering\, Indian Institute of Science\, Bangalore\, India)
URL:https://aero.iisc.ac.in/event/cism-iisc-workshop/
LOCATION:AE Auditorium
CATEGORIES:Workshops / Conferences
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2025/03/CISM-IISc.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250619T150000
DTEND;TZID=Asia/Kolkata:20250619T170000
DTSTAMP:20260417T115644
CREATED:20250616T090019Z
LAST-MODIFIED:20250616T090019Z
UID:10000080-1750345200-1750352400@aero.iisc.ac.in
SUMMARY:Ph.D. (Engg): Compressive behavior of continuous fiber polymer composites in the presence of process-induced defects
DESCRIPTION:The current work examines how process-induced defects influence the compressive behavior of composite structures. The defects analyzed include wrinkles at the macroscale and fiber misalignment at the microscale. Uni-directional carbon fiber-reinforced polymer composites with intentionally created wrinkles were produced by strategically positioning laminate strips. Through comprehensive experimental characterization\, the research thoroughly investigates the impact of wrinkle characteristics and their locations on compressive strength and failure modes. Furthermore\, the study explores how these wrinkle features affect the final kink bandwidth\, angle\, and inclination. Fractographic analysis of the failed specimens identified several damage modes across different length scales\, such as kinking\, delamination\, buckle delamination\, crushing\, fiber pullout\, matrix cracking or failure\, and fiber failure. These findings highlight the importance of considering the geometry of the wrinkles and the various damage modes at different scales when creating a numerical model to accurately predict the compressive behavior of the composite.\nUtilizing the damage modes identified through experimentation\, a three-dimensional repeating unit cell framework is used to investigate how various competing damage mechanisms—such as fiber failure\, matrix plasticity and cracking\, and fiber/matrix debonding—impact the compressive behavior of the composite material. A series of parametric studies is performed to evaluate the effects of factors like fiber volume fraction\, fiber misalignment\, and interfacial properties (including strength\, fracture energies\, and friction) on compressive performance. The results reveal a strong correlation between compressive strength and kink band characteristics with fiber volume fraction\, fiber misalignment\, interfacial shear strength\, interfacial friction\, and matrix cracking. This highlights the necessity of accurately characterizing the mechanical properties and geometric features of the composite constituents.\nTo account for the impact of realistic microstructures on compressive behavior\, a two-step homogenization process has been proposed to reduce computational demands and improve the efficiency of the numerical model. In the first step\, the model captures the homogenized elastic properties and longitudinal compressive behavior. These properties are then used as inputs for a model that consists of multiple domains discretized with Voronoi polygons\, each assigned a specific initial fiber misalignment angle based on a statistical distribution. The homogenized compressive behavior has been validated against previous studies and shows strong agreement. Additionally\, the proposed method has the potential to develop into a multiscale modeling strategy that predicts compressive behavior by considering variations in realistic microstructural characteristics. \nSpeaker:  Shashidhar K \nResearch Supervisor : Prof. Kartik Venkatraman (on behalf of Prof Suhasini Gururaja)
URL:https://aero.iisc.ac.in/event/ph-d-engg-compressive-behavior-of-continuous-fiber-polymer-composites-in-the-presence-of-process-induced-defects/
LOCATION:AE Auditorium
CATEGORIES:Thesis Colloquium / Defence
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2025/06/Shashidhar-.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250122T090000
DTEND;TZID=Asia/Kolkata:20250122T103000
DTSTAMP:20260417T115644
CREATED:20250122T033636Z
LAST-MODIFIED:20250122T050308Z
UID:10000049-1737536400-1737541800@aero.iisc.ac.in
SUMMARY:The 41st Annual Symposium on Space Science and Technology
DESCRIPTION:Indian Space Programme: has been a catalyst for advanced research\, technological innovation and space exploration in the country. Scientific data from ISRO’s earth observation\, lunar and planetary exploration missions are being used by hundreds of scientists across the country. More than 1000 R&D Projects have been supported through the RESPOND Programme and Space Technology cells. Human spaceflight programme is expected to provide an important platform for scientific research and development\, innovation and creativity. Microgravity science experiments in uncrewed and crewed missions will provide valuable insight into areas like crystal growth\, space agriculture\, cell and tissue growth and pharmaceutical research. It will also enable us to understand issues related to human health including muscular dystrophy\, heart disease and aging. The countermeasures developed could help in combating bone loss to help people dealing with osteoporosis A space-based platform such as the Bhartiya Antariksha Station has the potential to synergize national strengths and further enhance capabilities in sectors such as biotechnology\, robotics\, colloid research and combustion. Another objective of long duration microgravity research is to develop the ways and means to sustain human civilization away from earth. This has direct implication on human life on earth faced with depleting resources. The presentation on ‘Human spaceflight: A driver for Scientific research’ will briefly cover these aspects. \nSpeaker: Shri Imtiaz Ali Khan \n  \nBiography: \n1999-2014: Joined VSSC in 1999 and worked in processing and realization of Solid Rocket Motors. Contributed to development of new formulations\, propellant grains and processing techniques. This included PS0M-XL segments\, S-200 igniters\, ATV motors and Special Purpose Motors. Served as Manager\, Propellant Casting and Curing facility. Filed Patent for casting technique for thin webbed grains. Received ISRO Young Scientist award\, team achievement award and MR Kurup Gold medal. \n2014-2017: Served at Embassy of India\, Paris as Counsellor (Space). Contributed to enhancement of bilateral relations between India and France in Space. Participated in UNCOPUOS sessions at Vienna. Interacted with space agencies of Europe\, Germany and UK. \n2017–2021: Served as Officer on Special Duty at DoS Branch Secretariat\, New Delhi. Interacted with other Departments on Space applications\, satellite utilization and export control issues. Cabinet approvals for Human spaceflight programme\, GSLV MK III operationalization and PSLV flights were granted during the period. 2021-2022: Served as Group Director\, Biomedical Research\, Crew Administration and Training Group at HSFC. Astronaut Training Facility was established and commissioned. \n2022-2024: Director of the Directorate of Human Spaceflight Programme at ISRO HQ. Responsible for crew selection\, training\, national/international collaboration and programme management for Gaganyaan. \n 
URL:https://aero.iisc.ac.in/event/the-41st-annual-symposium-on-space-science-and-technology/
LOCATION:AE Auditorium
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2025/01/Imtiaz-.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250110T150000
DTEND;TZID=Asia/Kolkata:20250110T170000
DTSTAMP:20260417T115644
CREATED:20241230T092927Z
LAST-MODIFIED:20241230T092927Z
UID:10000047-1736521200-1736528400@aero.iisc.ac.in
SUMMARY:PHONONIC MATERIALS – AN AVENUE FOR PASSIVE FLOW CONTROL
DESCRIPTION:Specific modal and non-modal mechanisms (flow coherences) in fluid flows\, associated with distinct time and length scales\, govern important flow phenomena\, e.g.\, laminar-to-turbulent transition\, turbulent drag\, and flow separation. Consequently\, numerous passive strategies featuring compliant materials have explored the effect of Fluid-structure interaction (FSI) on various flow coherences. In recent years\, the emergence of Phononic materials (PMs) with engineered internal architectures provides a powerful tool to encode desired material behavior. Therefore\, flow configurations leveraging fluid-PM interaction offer an exciting opportunity to precisely engineer the spatiotemporal scales of the structural response relative to the flow coherences\, allowing a more fundamental and systematic study of FSI physics. Initial research efforts adopting the fluid-PM framework have demonstrated effective interaction with flow instabilities\, e.g.\, Tollmien–Schlichting waves. Building on these efforts\, our research group explores interesting FSI dynamics of canonical fluid flow – PM configurations to illustrate the potential of PMs for passive flow control. \nIn this talk\, I will present an overview of the PM design strategy and numerical and experimental results from our current fluid-PM interaction research projects. We configure PMs as subsurfaces and explore their FSI with flow coherences in various flow settings\, e.g.\, flow coherences in a turbulent channel flow\, Karman vortex streets in a subsonic flow past a cylinder\, wake vortices in flow past an airfoil. \n  \nSpeaker: Dr. Vinod Ramakrishnan \n  \nBiography:  \nDr. Vinod Ramakrishnan is a Postdoctoral research associate working with Dr. Kathryn Matlack at the University of Illinois at Urbana-Champaign. His research involves numerical and experimental investigations of Fluid-Metamaterial interaction models to explore avenues for passive flow control. Vinod holds a PhD in Mechanical Engineering from the University of California San Diego (2023) and a B. Tech in Mechanical Engineering from IIT Gandhinagar (2018). He worked with Dr. Michael Frazier during his PhD\, where his research explored phase transitions and strategies to control domain walls in multistable metamaterials to promote their adoption in applications\, e.g.\, energy harvesting\, mechanical memory devices\, and deployable structures.
URL:https://aero.iisc.ac.in/event/phononic-materials-an-avenue-for-passive-flow-control/
LOCATION:AE Auditorium
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/12/Vinod-.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20241218T110000
DTEND;TZID=Asia/Kolkata:20241218T123000
DTSTAMP:20260417T115644
CREATED:20241217T044151Z
LAST-MODIFIED:20241217T044151Z
UID:10000044-1734519600-1734525000@aero.iisc.ac.in
SUMMARY:Phase Transformations in Multifunctional Materials
DESCRIPTION:Phase transformation materials are characterized by their ability to rapidly and reversibly switch between distinct properties\, such as insulating and conducting\, paramagnetic and ferromagnetic\, or Li-rich and Li-poor. These transformations\, however\, are accompanied by abrupt structural changes in the crystal lattices\, which can nucleate defects\, accumulate strain energy\, and accelerate material decay. We investigate these transformations in multifunctional materials from the viewpoint of Ericksen’s multiple energy wells. By doing so\, we identify important links between material constants\, crystallographic microstructures\, and macroscopic properties. This approach to understanding material behavior from the perspective of energy landscapes may suggest new ways to design materials with improved properties and lifespans. In this talk\, I will present our findings on phase transformations in battery electrodes (intercalation compounds) and soft magnetic alloys.\n\n Speaker: Ananya Balakrishna\n\nBiography:\nAnanya Renuka Balakrishna is an Assistant Professor in the Materials Department at the University of California Santa Barbara. She received her B.Tech degree in Mechanical Engineering from the National Institute of Technology Karnataka and her Ph.D. in Solid Mechanics and Materials Engineering from the University of Oxford. Before her current appointment\, she was a Lindemann Postdoctoral Fellow at MIT and the University of Minnesota and joined the faculty in the Department of Aerospace & Mechanical Engineering at the University of Southern California in 2020. Her research group develops theoretical models to understand the interplay between fundamental material constants and microstructural instabilities\, and how they collectively shape the physical response of a material.
URL:https://aero.iisc.ac.in/event/phase-transformations-in-multifunctional-materials/
LOCATION:AE Auditorium
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/12/Ananya-.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20241209T110000
DTEND;TZID=Asia/Kolkata:20241209T130000
DTSTAMP:20260417T115644
CREATED:20241209T043233Z
LAST-MODIFIED:20241209T052550Z
UID:10000042-1733742000-1733749200@aero.iisc.ac.in
SUMMARY:Boundary Layer Transition Experiment in a Supersonic Flight
DESCRIPTION:In fluid mechanics\, the boundary-layer transition is a very important phenomenon for high-speed flows because it severely affects the skin friction and heating rates on the model surface. The classical correlations for high-speed flows have been developed based on experimental observations in wind tunnels. When the experiments are performed\, they are mostly controlled by the flow Reynolds number because the maximum size of the model is fixed based on the size of the test section of a wind tunnel. In most cases\, artificial surface roughness is introduced to initiate a transition towards turbulence because of the restricted model size. The flow Reynolds number and Station number on the model surface are crucial non-dimensional indicative parameters that characterize the transition behaviour of the flow. A realistic approach to simulate the effect of model size for studying the boundary layer transition is to conduct a flight test. Against this backdrop\, a systematic procedure is adopted to design a generic ogive nose cone-cylinder payload module (0.7 m long) for a boundary-layer transition experiment in a supersonic flight. Nickel thin film gauges are used to infer heat transfer data on the payload module at various locations for 10s flight duration. The heat transfer data from the temperature history are obtained using two different techniques: one-dimensional semi-infinite heat conduction analysis and deconvolution method. The analysis from flight data indicates a peak Mach number of 2.018\, which is achieved after 1.157s of flight. The Reynolds number during the flight is of the order of 10 million \, which is an indication of completely turbulent flow during flight duration. It is also supported by heat transfer prediction through the Stanton number\, which falls in the range of 0.5 to 1.2. It is concluded that the length of the model is not sufficient to initiate a transition towards relaminarization because the Stanton number and Reynolds number variation do not show any drastic change at any of the gauge locations. However\, the promising surface temperature histories from nickel thin film gauges during flight are very useful to devise more realistic heat-transfer models for for higher time scales flow duration through inverse heat-conduction analysis and modern machine learning models.\n\n Speaker: Prof. Niranjan Sahoo\n\nBiography : \nProf. Sahoo’s research interests lie in high-speed aerodynamics\, ground test facilities\, measurements for forces and heat transfer\, shock waves\, and their applications in allied fields\, combustion\, energy \, hydrogen energy and storage. He has been awarded fellowships from DAAD Germany\, BOYCAST and Young Scientist Scheme from DSTHe has offered several online courses (Applied Thermodynamics\, Power Plant System Engineering\, Advanced Thermodynamics and Combustion\, Fundamentals of Compressible Flow) on NPTEL platform. He has over 115 Journal Publications\, 153 in conference proceedings and 11 Book Chapters.
URL:https://aero.iisc.ac.in/event/boundary-layer-transition-experiment-in-a-supersonic-flight/
LOCATION:AE Auditorium
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/12/Niranjan.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20241024T150000
DTEND;TZID=Asia/Kolkata:20241024T170000
DTSTAMP:20260417T115644
CREATED:20241024T043037Z
LAST-MODIFIED:20241121T062124Z
UID:10000026-1729782000-1729789200@aero.iisc.ac.in
SUMMARY:Learning stable and accurate numerical schemes for LES applications
DESCRIPTION:Deep neural network machine learning models have demonstrated success in addressing time-dependent Partial Differential Equations (PDEs\, e.g.\, Physics Informed Neural Networks or PINNs and mesh graph network models by Google DeepMind). Yet\, these network models encounter two significant challenges: \n(1) generalisation to problems beyond their training data and (2) numerical instability during long-time evolutions. \nIn this talk a new spectral framework based on a local error analysis  is presented to design and optimize numerical methods for convection problems called Local Transfer Analysis (LTA). LTA converts traditional numerical discretisation to a network of impedance blocks where parameters can be introduced to tune the local block impedance. Such a network’s impedance can be tuned using a Deep Graph Network that predicts optimal values for the parameters that lead to matched impedance. This allows locally tuned traditional numerical schemes that do not suffer from stability problems\, at the same time generalises to a widerange of problems outside of training on unstructured meshes outperforming the unoptimised scheme. Application of the framework to tune and optimise the Two-step Taylor Galerkin scheme (TTGC) used extensively in CERFACS for Combustion LES problems is presented for linear convection\, inviscid Burgers’ and Euler equations on unstructured meshes. \n\nSpeaker:Dr. Pavanakumar Mohanamuraly \nBiography: \nDr. Pavanakumar Mohanamuraly currently serves as a Senior Researcher at the ALGO-COOP Team\, CERFACS\, Toulouse\, France. He has extensive experience in CAD-based Aerodynamics Shape Optimisation\, adjoint sensitivity analysis\, Machine Learning\, and high-performance computing\, and brings a wealth of knowledge and practical experience in algorithmic differentiation applied to parallel codes. He holds a PhD in Aerospace Engineering from Queen Mary University of London and an MS in Aerospace Engineering from Pennsylvania State University. His career includes \nroles at Integrated Test Range\, DRDO\, Balasore\, Honeywell Technology Solutions\, Bangalore\, National Aerospace Laboratories\, India\, Airbus Group\, Bangalore. His work has significantly contributed to the advancement of computational methods in CERFACS\, particularly in the areas of hybrid CFD and machine learning and parallel adaptive mesh refinement and exascale load-balancing problems.
URL:https://aero.iisc.ac.in/event/learning-stable-and-accurate-numerical-schemes-for-les-applications/
LOCATION:AE Auditorium
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/10/Reconstruction-Era-and-the-Gilded-Age-History-11th-Grade-Red-Variant-by-Slidesgo-1.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20241024T110000
DTEND;TZID=Asia/Kolkata:20241024T120000
DTSTAMP:20260417T115644
CREATED:20241118T094855Z
LAST-MODIFIED:20241118T095402Z
UID:10000022-1729767600-1729771200@aero.iisc.ac.in
SUMMARY:Bandgap Formation Mechanisms in Phononic Crystals with Square Bravais Lattice
DESCRIPTION:The engineered periodic structures\, known as phononic crystals\, exploit variations in geometric design to achieve distinct impedance contrasts\, thereby controlling wave propagation characteristics. These materials can effectively attenuate acoustic waves across a broad range of frequencies. The band structure of these metamaterials\, which dictates the range of frequencies over which wave propagation is prohibited\, is heavily influenced by the geometry\, mechanical properties\, and the symmetry group of the phononic crystal. The presence of higher symmetries often correlates with the emergence of complete omnidirectional bandgaps (BGs) — frequency ranges where waves of all polarizations attenuate exponentially due to mechanisms such as Bragg scattering\, local resonances\, or their combination. \nIn this work\, we calculate the band structures of p4\, p4mm and p4gm phononic crystals for real and imaginary Bloch wavevectors to understand the mechanisms behind the BG formation. We evaluate the BG’s attenuation properties by analyzing the real eigenvalues of the imaginary Bloch wavevectors\, which provide measurable evidence of the waves’ exponential decay. Furthermore\, we conduct experimental and numerical measurements of transmission loss for both P- and S-waves via finite crystals\, confirming the superior attenuation facilitated by the coupling of the Bragg and resonance BG mechanisms. This research validates the correlation between the measured transmission loss and the theoretically predicted evanescent modes within the BGs. \nSpeaker: Prof. Pavel I. Galich \nBiography: Pavel I. Galich\, PhD\, is an Assistant Professor at the Technion – Israel Institute of Technology\, where he leads the Wave Mechanics and Metamaterials Laboratory within the Faculty of Aerospace Engineering. He earned his PhD from the Technion\, AE and his MSc and BSc in Applied Mathematics and Physics from the Moscow Institute of Physics and Technology\, both with honors. His research interests focus on acoustic metamaterials\, wave propagation in non-linear materials\, and advanced composites for aerospace applications. Pavel has published extensively in high-impact journals and has presented his work at numerous international conferences.
URL:https://aero.iisc.ac.in/event/bandgap-formation-mechanisms-in-phononic-crystals-with-square-bravais-lattice/
LOCATION:AE Auditorium
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240712T113000
DTEND;TZID=Asia/Kolkata:20240712T123000
DTSTAMP:20260417T115644
CREATED:20240712T060711Z
LAST-MODIFIED:20240803T060918Z
UID:10000013-1720783800-1720787400@aero.iisc.ac.in
SUMMARY:State estimation strategies for space object tracking in the context of space situational awareness
DESCRIPTION:Due to increased human activity in the last two decades\, near-earth space has become congested from functional/non-functional satellites and space debris. These space objects of human origin\, along with natural asteroids and space weather\, pose natural\, accidental\, or intentional threats to functional and expensive satellites. It is imperative to track space assets continuously as well as assess collision threats to take necessary actions\, which is termed Space Situational Awareness (SSA). Assessing the risk of collision of these space debris with active satellites requires estimation of the positions and velocities of both objects. In this talk\, we will briefly discuss some recent advancements in non-linear state estimation techniques – computationally efficient Unscented Kalman Filter and Particle Filter\, and their effectiveness in various space vehicle tracking. We will also examine the possibility of using the underlying efficient uncertainty propagation technique used in these estimators for long-term position uncertainty propagation of a space object. We will then focus on space debris below 10 cm in diameter\, which is difficult to track. In this context\, we will present a Physics Informed Neural Network (PINN)—based approach for estimation of the trajectory of space debris after a collision event between an active satellite and space debris. \n  \nSpeaker: Dr. Sanat K. Biswas \nBiography: Dr. Sanat K. Biswas is an Assistant Professor at IIIT Delhi. He received the B.E. degree from Jadavpur University in 2010\, the M.Tech. degree in Aerospace Engineering from IIT Bombay in 2012\, and a PhD degree in computationally Efficient Unscented Kalman filters for space vehicle navigation from the University of New South Wales (UNSW)\, Sydney\, in 2017. At IIIT Delhi he leads the Space Systems Laboratory and is involved in developing algorithms for Space Situational Awareness\, NavIC reflectometry receiver for remote sensing applications and Precise Point Positioning (PPP) of Low Earth Orbit Satellites. Dr. Biswas serves on the technical committee on Space Communications and Navigation (SCAN)\, and the technical committee on Space Traffic Management (STM) of the International Astronautical Federation. He was the recipient of the 2014 Emerging Space Leaders Grant from the International Astronautical Federation\, the 2019 Early Career Research Award from the Department of Science and Technology\, India and the Young Scientist Award 2020 and 2021 from the International Union of Radio Science (URSI) and 2020 Harry Rowe Mimno Award from the IEEE Aerospace and Electronic Systems Society.
URL:https://aero.iisc.ac.in/event/state-estimation-strategies-for-space-object-tracking-in-the-context-of-space-situational-awareness/
LOCATION:AE Auditorium
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240627T153000
DTEND;TZID=Asia/Kolkata:20240627T163000
DTSTAMP:20260417T115644
CREATED:20240626T053743Z
LAST-MODIFIED:20240803T060237Z
UID:10000009-1719502200-1719505800@aero.iisc.ac.in
SUMMARY:[MTech(Res) Colloquium] Inflatable aerodynamic decelerators for atmospheric re-entry
DESCRIPTION:Atmospheric re-entry is the most challenging part of human space flight. In the re-entry phase of flight\, the crew module (or re-entry vehicle) is required to bring the onboard astronauts from orbital velocities\, which are in the range of several kilometers per second\, to near-zero velocity at touchdown\, in a safe and controlled manner. The crew module experiences severe aerodynamic heating and large deceleration loads (g-forces) as it descends into the atmosphere at high hypersonic velocities. Re-entry poses formidable engineering challenges\, and also places great physical and mental demands on astronauts.\n\nThe re-entry crew module of the Gaganyaan space program follows a positive L/D (aerodynamic lift to drag ratio) descent trajectory that is established through an offset CG (center of gravity) design. Reaction thrusters provide roll\, pitch\, and yaw control. The design and philosophy of the Gaganyaan crew module is similar to that of the Soyuz crew module. However\, the Soyuz crew module additionally incorporates a ballistic descent mode for use during off-nominal (emergency) situations. Ballistic descent requires a zero L/D condition\, which is achieved by Soyuz through a continuous rotation of the crew module at the rate of 13 degrees per second. The Gaganyaan crew module does not presently incorporate such a feature.\n\nThe present effort is aimed at developing the concept of inflatable aerodynamic decelerators (IADs) to achieve standby ballistic mode capability\, and to also reduce deceleration and aerodynamic heating loads during routine re-entry (or entry to other planetary atmospheres). The aerodynamic characteristics of a canonical re-entry body – crew module with an IAD – at hypersonic Mach numbers is studied through flow computations (using Reynolds-averaged Navier–Stokes equations) and wind tunnel experiments. The L/D of the re-entry body is varied by changing its CG location\, which is achieved by altering the relative position of the IAD with respect to the crew module. The default re-entry body configuration is set for a positive L/D\, which significantly limits deceleration and aerodynamic heating loads. The L/D is brought to zero to achieve ballistic re-entry in an off-nominal situation. Using the aerodynamic data obtained from flow computations and experiments\, the advantages of using an IAD for re-entry are quantitatively assessed and demonstrated through trajectory analysis. A preliminary engineering feasibility study for the proposed concept is also presented in this thesis.\n\nSpeaker: Gp. Capt. Prasanth Balakrishnan Nair (ISRO Human Space Flight Centre)
URL:https://aero.iisc.ac.in/event/mtechres-colloquium-inflatable-aerodynamic-decelerators-for-atmospheric-re-entry/
LOCATION:AE Auditorium
CATEGORIES:Thesis Colloquium / Defence
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/Thesis-Colloquium-Defence.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240531T153000
DTEND;TZID=Asia/Kolkata:20240531T170000
DTSTAMP:20260417T115644
CREATED:20240531T052920Z
LAST-MODIFIED:20240802T115823Z
UID:10000007-1717169400-1717174800@aero.iisc.ac.in
SUMMARY:Re-scaling of properties in wall-bounded turbulent flows
DESCRIPTION:Max Plank is supposed to have said that Science progresses one funeral at a time. Prof. Sreenivasan will discuss the conventional wisdom of wall-bounded turbulent flows while keeping in mind the modified thought that even funerals are sometimes not enough. \n  \n  \nSpeaker: Prof. K.R. Sreenivasan \nBiography: Prof. Katepalli R. Sreenivasan is currently the Satish Dhawan Visiting Professor at IISc. He is a University Professor at New York University (NYU)\, a distinguished title conferred upon him for his interdisciplinary work that reflects exceptional breadth. He holds Eugene Kleiner Chair Professorship for Innovation with affiliations to NYU’s Physics Department\, Courant Institute of Mathematical Sciences\, and Tandon School of Engineering. He was the Dean of the NYU Tandon School of Engineering. Prior to joining NYU\, he was the Director of the International Centre for Theoretical Physics in Trieste\, Italy\, and professor at University of Maryland and Yale. He is also a Distinguished Alumnus of IISc. Prof. Sreenivasan is an expert in fluid dynamics and turbulence\, and his research spans across a few other areas of applied physics. He has held several administrative positions\, won a number of prestigious international awards\, and is an elected member of numerous academies across the globe including the US National Academy of Sciences and the Indian Academy of Sciences.
URL:https://aero.iisc.ac.in/event/re-scaling-of-properties-in-wall-bounded-turbulent-flows/
LOCATION:AE Auditorium
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240527T153000
DTEND;TZID=Asia/Kolkata:20240527T163000
DTSTAMP:20260417T115644
CREATED:20240527T042855Z
LAST-MODIFIED:20240803T053109Z
UID:10000006-1716823800-1716827400@aero.iisc.ac.in
SUMMARY:[PhD Colloquium] On the nature of transonic buffet in a finite span wing
DESCRIPTION:Transonic buffet\, or shock oscillations\, is a pre-stall aerodynamic instability\, caused by shock boundary layer interaction\, of the flow over a wing. This aerodynamic instability occurs at critical combinations of transonic Mach number and angle of attack. Shock oscillations cause vibrations of the wing and is known as buffeting. Buffeting may cause fatigue of the wing\, and in an overall sense limit the flight envelope of the aircraft. Despite decades of study\, an unequivocal understanding of the physical mechanism of transonic buffet is lacking. In literature\, global stability analysis\, modal analysis\, and spatial correlation-based wave propagation analysis have been the tools of choice in understanding the mechanisms that cause transonic buffet. Here we present a perspective on transonic buffet\, using results from correlation analysis\, streamwise and spanwise pressure distributions\, and the temporal evolution of skin friction lines on the surface of the Benchmark Supercritical Wing (BSCW). Skin friction lines and critical point theory are well established to describe 3D separated flows over solid walls and bodies. Together with correlation analysis of time-resolved fluid dynamics\, the evolution of skin friction lines reveals a new perspective on the driving mechanism for shock oscillations. This viewpoint supports\, in some ways\, earlier observations on the drivers of shock-induced separation in a finite span and infinite span wing\, but also reveals new insights on 3D shock oscillations. The presence and distribution of these critical points—unstable foci\, saddle points\, and nodes—lead to the formation of buffet cells or pockets of streamwise shock oscillations along the span. The topology of skin friction lines in the presence of these critical points\, gives rise to separation and re-attachment lines. In particular\, the propagation of buffet cells is shown to be due to the self-induced motion of contra-rotating unstable foci in the skin friction lines. The self-induced motion of these unstable foci\, or vortices\, causes them to convect inboard or oscillate spanwise. This perspective on transonic buffet based on the distribution of critical points of the skin friction lines\, enables possibilities of buffet control using low-order nonlinear dynamical system models. \nSpeaker: Magan Singh
URL:https://aero.iisc.ac.in/event/on-the-nature-of-transonic-buffet-in-a-finite-span-wing/
LOCATION:AE Auditorium
CATEGORIES:Thesis Colloquium / Defence
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/Thesis-Colloquium-Defence.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240405T173000
DTEND;TZID=Asia/Kolkata:20240405T183000
DTSTAMP:20260417T115644
CREATED:20240405T112534Z
LAST-MODIFIED:20240802T165512Z
UID:10000004-1712338200-1712341800@aero.iisc.ac.in
SUMMARY:CyberSHM: A cyberphysical continuous monitoring technology for safety-critical structures
DESCRIPTION:Continuous monitoring is crucial for ensuring the proper functioning and longevity of operational structures in safety-critical applications. To address\, we are exploring the use of smart\, self-sensing structures that combine edge computing\, physics-informed and machine learning-enabled monitoring techniques. Of particular interest are thin-walled laminated composite structures with high-density cores and discontinuities that are especially challenging due to their complex waveguide behaviour. This talk will focus on the use of acousto-ultrasonic signals to monitor and interrogate such thin-walled structures for hidden barely visible damages. \nThe dispersion and wave scattering associated with these structures make traditional time-of-arrival (ToA) techniques ineffective for holistic damage identification. A singular focus on ToA results in under exploitation of several signal features needed for a multiclass representation of damages. Data-driven machine learning-based approaches are being explored which can map complex set of signal features to acoustic source characteristics. But rather than working as a black-box model for damage identification\, these must complement the physics-based model predictions to incorporate physical plausibility and thus establish a robust grey-box predictor. Physics-based dispersion characteristics is modelled with a semi-analytical approach which allows for interlaminar damage features to be incorporated into the model. The data-driven component focusses on training a high-dimensional Bayesian surrogate model which maps complex signal features in the time-frequency domain to the damage parameters such as location\, type and severity. Inverse identification is performed with a Bayesian approach which quantifies and incorporates measurement and model-form uncertainty into robust predictions of structural damage metrics and the associated confidence bounds. \nThe stated aim of continuous monitoring presents several challenges ranging from reducing the footprint of signal acquisition/processing hardware to combining cloud computing with edge computing to be deployed for conditioning and transmission of signals for real-time decision making. We conceptualise this as a Cyberphysical Structural Health Monitoring or a CyberSHM system which is an automated monitoring framework integrated with the internet and working collaboratively with human end-users. The study uses carbon-fibre composite panels with stiffeners as a test bench\, subjecting them to impact and fatigue loading and monitored with a CyberSHM system\, thus realising a generalized automated approach for online monitoring of thin-walled structures highlighting its effectiveness\, challenges and a futuristic vision of this technology. \n  \nSpeaker: Dr. Abhishek Kundu \nBiography: Dr Abhishek Kundu is a Senior Lecturer at the Computational Mechanics & Engineering AI research group at the Cardiff School of Engineering\, Cardiff University\, UK and an elected member of the Royal Aeronautical Society. His research interests span the fields of structural health monitoring (SHM)\, stochastic structural dynamics\, uncertainty quantification\, machine learning and Bayesian identification. His main contribution lies in efficient computational techniques for the study of stochastic structural dynamics systems and control and data-driven approaches for SHM. He completed his PhD from Swansea University as Zienkiewicz scholar in 2014. Dr Kundu has authored more than 50 scientific publications and was awarded the best paper at the European Workshop on Structural Health Monitoring (EWSHM 2018). Amongst his main research engagements\, he has been the recipient of Royal Academy of Engineering’s Industrial Fellowship with Airbus and currently serves as the principal investigator in the EPSRC funded project on CyberSHM.
URL:https://aero.iisc.ac.in/event/cybershm-a-cyberphysical-continuous-monitoring-technology-for-safety-critical-structures/
LOCATION:AE Auditorium
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
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