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X-ORIGINAL-URL:https://aero.iisc.ac.in
X-WR-CALDESC:Events for Department of Aerospace Engineering
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TZID:Asia/Kolkata
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DTSTART:20250101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250110T150000
DTEND;TZID=Asia/Kolkata:20250110T170000
DTSTAMP:20260418T111250
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
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250116T110000
DTEND;TZID=Asia/Kolkata:20250116T130000
DTSTAMP:20260418T111250
CREATED:20250115T054120Z
LAST-MODIFIED:20250115T054120Z
UID:10000048-1737025200-1737032400@aero.iisc.ac.in
SUMMARY:Ph.D. (Engg): Transonic shock buffet in an axial flow fan
DESCRIPTION:Transonic shock buffet\, a self-sustained shock oscillation resulting from shock-boundary layer interaction\, is observed across a range of operating points on the performance map of a transonic axial flow fan. Shock oscillations impart time-varying air loads on fan blades with the potential of leading to fatigue-induced structural failure. Accurate estimations of shock buffet onset\, shock displacement\, and buffet frequency are critical to lifing assessment of turbomachinery blades. This study focuses on predicting transonic shock buffet in a transonic axial flow fan using high-fidelity numerical simulations\, followed by investigation of its underlying mechanisms through wave propagation analysis and modal analysis of buffet flow. Steady flow solutions obtained using a RANS solver predict performance characteristics and capture key features of the fan’s shock structure in conformation with experimental and numerical results from the literature. Unsteady flow simulations on a full-annulus model using URANS successfully capture shock buffet and its salient attributes at two operating points—near design mass flow and near stall. Wave propagation analysis and spectral proper orthogonal decomposition of buffet flow reveal a feedback loop of upstream and downstream propagating pressure perturbation waves driving shock buffet. Subtle modification to Lee’s buffet model is proposed for accurately predicting buffet frequency in a turbomachinery context. Buffet flow is characterized by circumferential\, radial\, and stream-wise pressure perturbation waves\, with circumferential flow periodicity breaking down during buffet. A global stability analysis framework is presented and its prognostic potential for predicting shock buffet in turbomachinery is evaluated. The global stability analysis framework enables accurate prediction of buffet frequencies and associated modes with drastically reduced computational cost compared to that required for unsteady simulations. Finally\, the aeromechanical response of the fan to buffet-induced unsteady air loads is assessed. The buffet frequencies do not excite resonant blade vibrations or buffeting but induce an alternating mis-staggering structural response in the fan blades due to aerodynamic mistuning arising of buffet flow. In summary\, we have shown\, for the first time\, transonic shock buffet in an axial flow fan can be captured using a full-annulus simulation. Further\, this study advances the understanding of transonic shock buffet mechanisms\, demonstrating robust methodologies for predicting shock buffet\, and assessing its aeromechanical implications in turbomachinery. \n  \nSpeaker : Jyoti Ranjan Majhi \n  \nResearch Supervisor: Prof. Kartik Venkatraman.
URL:https://aero.iisc.ac.in/event/ph-d-engg-transonic-shock-buffet-in-an-axial-flow-fan/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:Thesis Colloquium / Defence
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2025/01/Jyoti-.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250122T090000
DTEND;TZID=Asia/Kolkata:20250122T103000
DTSTAMP:20260418T111250
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
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250128T090000
DTEND;TZID=Asia/Kolkata:20250131T170000
DTSTAMP:20260418T111250
CREATED:20250127T042311Z
LAST-MODIFIED:20250127T042955Z
UID:10000050-1738054800-1738342800@aero.iisc.ac.in
SUMMARY:AERES 2025
DESCRIPTION:The Department of Aerospace Engineering\, IISc\, is excited to invite you to AERES 2025—a premier Aerospace Research Students’ Symposium. This 4-day event brings together MTech and PhD students from IISc and other leading institutes to showcase innovative research and connect with industry experts. \n  \nWhy Attend AERES 2025? \n• 6 Keynote Talks: Hear from distinguished leaders in the aerospace industry. \n• 2 Workshops: Enhance your skills with hands-on learning opportunities. \n• Oral and Poster Presentations: Discover groundbreaking research and engage in discussions on cutting-edge advancements. \nThis symposium offers an excellent platform to network\, learn from industry leaders\, and explore the latest trends in aerospace technology. \nThis year we are also welcoming select student participants from Indian Institute of Space Science and Technology (IIST) to attend and present their research in AERES. \n  \nSchedule Link:  \nhttps://ca00f07c-32a8-46fd-ad7a-fb170b00b80e.filesusr.com/ugd/0858f9_0ebf6e9519354c66ae41e406446cbd13.pdf
URL:https://aero.iisc.ac.in/event/aeres-2025/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
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