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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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TZOFFSETFROM:+0530
TZOFFSETTO:+0530
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DTSTART:20260101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260901T110000
DTEND;TZID=Asia/Kolkata:20260901T130000
DTSTAMP:20261001T154241
CREATED:20260831T045301Z
LAST-MODIFIED:20260904T050250Z
UID:10000148-1788260400-1788267600@aero.iisc.ac.in
SUMMARY:Ph.D. (Engg):Effect of rotation on the flow organisation and instability of a slender spinning body across quiescent\, axial and compressible regimes
DESCRIPTION:A body of revolution spinning in a fluid drives an inherently three-dimensional boundary layer\, in which a centrifugally driven secondary circulation lifts the layer off the surface and a centrifugal instability carries it into transition. Most of what is known about this flow comes from single geometries (the rotating disk\, the isolated cone or cylinder) in an unbounded fluid\, and from diagnostics that resolve neither the secondary meridional circulation nor the three-component velocity of the vortices. This work instead resolves the rotation-driven layer with whole-field measurements on a composite\, finite cone–cylinder (half-cone angle 15°)\, and follows it across the settings in which such a layer arises in practice\, of relevance to spin-stabilised flight and rotating machinery: a still fluid with and without confining walls\, the transient establishment from rest\, an imposed axial stream\, and\, as a bounding case\, a compressible free stream.\nCombining planar (two-component) and time-resolved stereoscopic (three-component) particle image velocimetry in the meridional plane with a phase-locked acquisition and a proper-orthogonal decomposition of the fluctuating field\, the study shows how confinement changes the transition from a sharp two-branch switch to a smooth downstream migration coupled to a growing separation bubble; how the layer establishes advectively from rest in a single turnover\, some fifty times faster than viscous diffusion; and how the base rotation ratio Sᵇ = ωR/U∞ organises transition under axial inflow\, with onset at Sᵇ of order unity. As a bounding case\, a slender cone spun in a Mach 2 stream leaves the shock-dominated mean flow and the surface topology essentially unchanged\, adding only broadband unsteadiness with no tonal lock-in\, so that the rotation-driven layer\, though real\, is masked at supersonic speed. Taken together\, the studies trace a single rotation-driven\, centrifugally unstable boundary layer\, with its meridional lift-up and counter-rotating vortices\, reshaped in turn by confinement\, start-up\, axial inflow and compressibility. \nSpeaker : Rajkamal Sah \nResearch Supervisor : Prof. Gopalan Jagadeesh
URL:https://aero.iisc.ac.in/event/ph-d-enggeffect-of-rotation-on-the-flow-organisation-and-instability-of-a-slender-spinning-body-across-quiescent-axial-and-compressible-regimes/
LOCATION:STC Seminar Hall\, Dept. of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2026/09/Rajkamal-Sah.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260901T140000
DTEND;TZID=Asia/Kolkata:20260901T170000
DTSTAMP:20261001T154241
CREATED:20260825T054145Z
LAST-MODIFIED:20260825T054307Z
UID:10000147-1788271200-1788282000@aero.iisc.ac.in
SUMMARY:Taming Turbulence
DESCRIPTION:Turbulence remains one of the outstanding problems of classical physics\, and one that has challenged physicists and engineers alike for decades\, even centuries. The fusion of classical approaches and tools of the modern day – theoretical analysis of the Navier-Stokes equations\, state-of-the-art experimental observations\, data-driven methods and machine learning – has led to substantial progress towards understanding the mechanisms sustaining turbulence\, developing predictive capabilities and achieving the potentially revolutionary goal of harnessing or taming turbulence in large-scale (high Reynolds number) practical settings. In this talk\, I will describe some fundamental challenges posed by turbulence near walls\, the impact of this phenomenon on many of the world’s pressing scientific concerns\, and some recent advances.\n\n \nSpeaker : Prof. Beverley McKeon\n\nbiography:\n\nBeverley J. McKeon is Professor of Mechanical Engineering at Stanford. She received her B.A.\, M.A. and M.Eng. from the University of Cambridge in the United Kingdom\, and an M.A. and Ph.D. in Mechanical and Aerospace Engineering from Princeton University. She completed postdoctoral research and a Royal Society Dorothy Hodgkin Fellowship at Imperial College London. Best known for her work pioneering resolvent analysis as an equation-driven tool to analyze and predict the dynamics of turbulent flow\, her research group has specialized in addressing its application to understand and modify wall turbulence in numerical data and via experiments with external forcing. Prof. McKeon is a Fellow of the APS and the AIAA and the recipient of a Vannevar Bush Faculty Fellowship from the DoD in 2017\, the Presidential Early Career Award (PECASE) in 2009 and an NSF CAREER Award in 2008 as well as Caltech’s Shair Program Diversity Award\, Graduate Student Council Excellence in Mentoring Award and Northrop Grumman Prize for Excellence in Teaching. She currently serves as co-Lead Editor of Physical Review Fluids and on the editorial board of the Annual Review of Fluid Mechanics.\n \nCoffee/tea will be served after the seminar at 3:30 pm.\n\nAt 4:00 pm\, Prof. McKeon will hold a special session on Physical Review Fluids\, one of the world’s leading research journals for fluid dynamics. Prof. McKeon is the co-Lead Editor of the journal. The session includes a short presentation on the journal’s history\, Q&A\, and a short tutorial on writing a successful submission.
URL:https://aero.iisc.ac.in/event/taming-turbulence/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/png:https://aero.iisc.ac.in/wp-content/uploads/2026/08/taming_turbulence_poster_16x9-4.png
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260921T110000
DTEND;TZID=Asia/Kolkata:20260921T130000
DTSTAMP:20261001T154241
CREATED:20260917T113043Z
LAST-MODIFIED:20260923T090942Z
UID:10000151-1789988400-1789995600@aero.iisc.ac.in
SUMMARY:Illuminating Complex Flows: Optical Diagnostics for Aerospace Applications
DESCRIPTION:Hypersonic flight represents a major frontier in aerospace engineering\, with its realization requiring a fundamental understanding of coupled chemical and fluid dynamic processes across multiple environments. Of particular importance are the reacting flows within the propulsion systems that enable sustained hypersonic flight and the high-temperature\, chemically reacting flows that develop near vehicle surfaces at extreme speeds. Understanding the complex and strongly coupled phenomena governing these environments requires a synergistic combination of high-fidelity computation and carefully designed experiments. Experimental investigations\, however\, are inherently challenging\, often relying on sophisticated ground-based facilities equipped with advanced diagnostic capabilities to generate meaningful\, high-resolution data. Among these\, optical diagnostics have emerged as a powerful class of measurement tools\, offering significant advantages over conventional techniques. Their non-intrusive nature\, high temporal resolution\, and robustness under extreme conditions make them uniquely suited for probing high-speed\, high-enthalpy flows. Continued advances in optical diagnostics have enabled transformative progress across multiple domains of aerospace research\, including chemical kinetics\, aerodynamics\, and active flow control.\nThis talk will focus on a specific application of advanced optical diagnostics: elucidating the chemical kinetics of complex fuels such as jet fuels\, gasoline surrogates\, and rocket propellants under engine-relevant conditions. Particular emphasis will be placed on the role of advanced laser-based diagnostics\, coupled with shock tube reactors\, in uncovering fundamental insights into the behavior of large hydrocarbons and their mixtures at elevated temperatures and pressures. These insights have enabled the development of the Low-Temperature Hybrid Chemistry (LT-HyChem) framework\, a methodology for constructing compact\, fuel-specific chemical kinetic models that remain valid across the full range of operating conditions relevant to modern and next-generation propulsion systems. The LT-HyChem approach is fuel-agnostic and produces models that are over two orders of magnitude more compact than those generated using conventional methodologies\, while simultaneously reducing predictive uncertainties by more than an order of magnitude. This combination of compactness and accuracy facilitates integration with computational fluid dynamics solvers\, significantly reducing the computational cost associated with combustor design\, analysis\, and optimization. The talk will conclude with a discussion of the broader implications of this work for rapid screening of sustainable aviation fuels and potential extensions to solid fuel systems.\n\nSpeaker: Dr. Rishav Choudhary\n\nBiography:\nDr. Rishav Choudhary received his B.Tech. in Aerospace Engineering from IIT Kanpur and his M.S. and Ph.D. in Mechanical Engineering from Stanford University. His doctoral research focused on absorption-spectroscopy-based diagnostics for chemical kinetics under extreme conditions relevant to engine combustion\, hypersonic re-entry\, and other high-temperature environments. He subsequently worked as a Postdoctoral Researcher in Aerospace Engineering at the University of Michigan\, developing optical diagnostics for high-speed density fluctuations\, velocity measurements in supersonic flows\, and electron-density measurements in plasmas. He is currently an Engineer at Lam Research Corporation\, where his work involves optical diagnostics applied to multiphase flows and plasmas relevant to semiconductor manufacturing.\n\nNote: Dr. Rishav Choudhary is a faculty candidate in the Propulsion stream in the Department of Aerospace Engineering\, IISc. Faculty members are encouraged to attend the talk and interact with the candidate.\n\n\n\n\n\n 
URL:https://aero.iisc.ac.in/event/illuminating-complex-flows-optical-diagnostics-for-aerospace-applications/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2026/09/Dr.-Rishav-.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260925T150000
DTEND;TZID=Asia/Kolkata:20260925T170000
DTSTAMP:20261001T154241
CREATED:20260915T052755Z
LAST-MODIFIED:20260915T052755Z
UID:10000150-1790348400-1790355600@aero.iisc.ac.in
SUMMARY:Magneto-Active Solids for Adaptive Structures: Can Magnetic Fields Control Elastic Waves?
DESCRIPTION:Magneto-active solids couple their mechanical response to externally applied magnetic fields\, providing a promising route toward remotely tunable materials and structures. Such functionality is particularly attractive for aerospace applications involving vibration isolation\, adaptive structures\, sensing\, and elastic-wave control. However\, exploiting this coupling requires understanding a fundamental question: when does a magnetic field actually modify elastic-wave propagation\, and which wave modes are affected?\n\nIn this seminar\, Prof. Galich will present recent theoretical and experimental work on elastic waves in magneto-active solids. Starting from the incremental theory of nonlinear magnetoelasticity\, he will introduce the generalized acoustic tensor governing small-amplitude waves superimposed on a magnetically biased state. For compressible isotropic magneto-active polymers\, magnetic tunability is shown to be strongly dependent on wave polarization. In an undeformed material subjected to a magnetic field transverse to the propagation direction\, the shear wave polarized along the magnetic field is directly field-sensitive\, whereas the pressure wave and the orthogonally polarized shear wave remain essentially unaffected. These theoretical predictions are supported by ultrasonic experiments on 3D-printed iron-filled polymers.\n\nThe discussion will then extend from bulk waves to Rayleigh surface waves\, where the coupling between mechanics and magnetism introduces additional questions concerning constitutive modeling and stability. In particular\, physically consistent selection of magnetoelastic material parameters is essential: models that reproduce the magnetic permeability but violate the corresponding Maxwell-stress condition can predict artificially strong wave-speed changes and even surface instabilities.\n\nFinally\, the seminar will cover periodic magneto-active solids\, where magnetic fields\, finite deformation\, and material architecture can be combined to control elastic-wave dispersion and phononic bandgaps. These results illustrate both the opportunities and fundamental limitations of magnetic-field control of elastic waves and provide guidelines for the development of adaptive materials and structures for vibration manipulation.\n\nSpeaker :  Prof. Pavel I. Galich\n\nBiography:\n\nProf. Pavel I. Galich has been an Assistant Professor at The Stephen B. Klein Faculty of Aerospace Engineering\, Technion\, since 2020. He earned his Ph.D. in Aerospace Engineering from the Technion in 2018 and served as a Postdoctoral Research Associate in the Department of Materials Science & NanoEngineering (MSNE) at Rice University from 2018 to 2020.
URL:https://aero.iisc.ac.in/event/magneto-active-solids-for-adaptive-structures-can-magnetic-fields-control-elastic-waves/
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/png:https://aero.iisc.ac.in/wp-content/uploads/2026/09/Prof.-Pavel-I.-Galich.png
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