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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:20260101T000000
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DTSTART;TZID=Asia/Kolkata:20260901T110000
DTEND;TZID=Asia/Kolkata:20260901T130000
DTSTAMP:20260919T143350
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:20260919T143350
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:20260915T110000
DTEND;TZID=Asia/Kolkata:20260915T130000
DTSTAMP:20260919T143350
CREATED:20260909T051218Z
LAST-MODIFIED:20260915T051721Z
UID:10000149-1789470000-1789477200@aero.iisc.ac.in
SUMMARY:Invited Talk on the Occasion of the Engineer's Day - From MV to Spaceflight: Satellite Re-entry and the Future of Space Sustainability
DESCRIPTION:National Engineers’ Day commemorates the legacy of Sir M. Visvesvaraya\, whose vision and engineering leadership helped lay foundations for India’s technological development. From civil infrastructure and water resource management to advanced aerospace systems\, India’s engineering journey has been characterised by the pursuit of innovation that delivers enduring societal value. As India extends its capabilities in space exploration\, satellite services\, human spaceflight\, and a growing commercial space sector\, attention is increasingly turning to the sustainability of space activities across the entire lifecycle of a spacecraft\, including its final return to Earth.\nThis seminar examines the end-of-life phase of satellites\, focusing on the competing concepts of design for demise and design for recovery during atmospheric re-entry. While these approaches have traditionally been evaluated in terms of ground safety and debris mitigation\, recent studies have raised important questions regarding the introduction of metallic oxides and other compounds into atmospheric regions where they are not normally present. Drawing on observations of spacecraft re-entries and current research into demise physics\, material response\, and environmental impacts\, the presentation will explore the challenges and opportunities associated with sustainable spacecraft disposal. In doing so\, it considers how future spacecraft design and operations may contribute to a responsible and enduring spacefaring future for India and the global community. \nSpeaker : Prof. David Buttsworth \nBiography ::\nProfessor David Buttsworth is Professor of Thermofluids Engineering at the University of Southern Queensland\, where he leads the Hypersonics and Rocketry Group within the Institute for Space\, Defence and Advanced Technologies. He is also an Honorary Professor at the University of Queensland\, from which he holds a BE (Hons) and a PhD on shock-induced mixing and combustion in scramjets. He designed and built the TUSQ hypersonic wind tunnel\, a key Australian facility for re-entry and hypersonic ground testing\, and has led airborne optical observation campaigns of spacecraft re-entry\, including the Hayabusa capsule return. He currently leads Australian Research Council-funded research on the dispersion and demise of spacecraft components during atmospheric re-entry. He is a Senior Member of the American Institute of Aeronautics and Astronautics. Prof. Buttsworth is a Fellow of the Society for Shock Wave Research
URL:https://aero.iisc.ac.in/event/invited-talk-on-the-occasion-of-the-engineers-day-from-mv-to-spaceflight-satellite-re-entry-and-the-future-of-space-sustainability/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
ATTACH;FMTTYPE=image/png:https://aero.iisc.ac.in/wp-content/uploads/2026/09/Slide1.png
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260925T150000
DTEND;TZID=Asia/Kolkata:20260925T170000
DTSTAMP:20260919T143350
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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