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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
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DTSTART:20260101T000000
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DTSTART;TZID=Asia/Kolkata:20260507T150000
DTEND;TZID=Asia/Kolkata:20260507T170000
DTSTAMP:20260615T110535
CREATED:20260505T050440Z
LAST-MODIFIED:20260505T050440Z
UID:10000123-1778166000-1778173200@aero.iisc.ac.in
SUMMARY:On Rayleigh Waves in Elastic Lattices
DESCRIPTION:A mathematical framework is presented to guide the search for Rayleigh waves in lattice materials based on periodic structure theory and the Bloch theorem. Architected materials with a periodic microstructure are distinguished from crystals in continuum anisotropic elasticity by the presence of at least one length scale and a band structure with partial and complete gaps for Bloch wave propagation. Non-affine bending deformations at or below the characteristic cell size are included by considering the unit cell as a framework of Timoshenko beams. We show that a quadratic eigenvalue problem\, with a Hermitian palindrome structure\, emerges from the force equilibrium and displacement compatibility relations for a propagating Bloch wave along any chosen orientation of the free edge/surface. Waves propagating along the free edge and penetrating to a finite depth into the medium are a partial set of eigensolutions of the nonlinear eigenproblem\, or its linearized symplectic form. These partial eigenwaves are used as the basis vectors to expand any arbitrary boundary displacements and force vectors\, which then constitute a complex asymmetric semi-infinite dynamic stiffness matrix. Surface and Rayleigh waves exist in its null space. Traction-free boundary conditions are used to show that the secular equation for Rayleigh waves is a real polynomial equation\, consistent with Stroh’s formulation for a length-scale independent anisotropic continuum crystal elasticity. Significant differences arising from the periodic structure are highlighted. Computational issues in the numerical solution of the structured eigenvalue problem for surface waves in lattices are addressed. Our formulation is applicable to any arbitrary lattice with complex unit cells and material architectures. Surface waves in a planar square lattice are found to emerge from the gaps for bulk waves in the band structure of the bulk waves. This research is a collaboration with Prof. N.A. Fleck of Cambridge University\, United Kingdom. \nSpeaker: Prof. Anasavarapu Srikantha Phani \nBiography: \nSrikanth is a tenured full professor at the University of British Columbia\, Vancouver\, Canada. He received a PhD from Cambridge University in the Dynamics and Applied Mechanics group under the supervision of Prof. Woodhouse and there he pursued postdoctoral work with Prof. Fleck in the Cambridge Center for Micromechanics. His principal research interests include\, Dynamics and Vibrations\, Mechanics of advanced materials\, and their applications in engineering and cardiovascular medicine. At UBC\, he held a Tier 2 Canada Research chair\, and received Killam Teaching prize.
URL:https://aero.iisc.ac.in/event/on-rayleigh-waves-in-elastic-lattices/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2026/05/On-Rayleigh-Waves-in-Elastic-Lattices2-1_page-0001.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260522T110000
DTEND;TZID=Asia/Kolkata:20260522T130000
DTSTAMP:20260615T110535
CREATED:20260514T043230Z
LAST-MODIFIED:20260519T083650Z
UID:10000126-1779447600-1779454800@aero.iisc.ac.in
SUMMARY:Fluid dynamics across scales: Insights from compressible turbulence and large-scale tropical atmospheric dynamics
DESCRIPTION:Fluid flows in nature and engineering exhibit a wide range of spatial and temporal scales. This talk presents two problems across this range: compressible turbulence in channel flows and large-scale vorticity dynamics in the tropical atmosphere.\nThe first part of the talk focuses on compressible turbulence\, which plays a key role in many aerospace flows\, including supersonic and hypersonic flight\, shock-boundary layer interactions\, and scramjet combustion. In contrast to incompressible turbulence\, compressible turbulence is characterised by fluctuations in both thermodynamic variables of density\, temperature and pressure\, in addition to velocity. Using Lie symmetry theory\, we derive scaling laws for velocity and thermodynamic statistics in compressible channel flows. As a first step\, we derive a hierarchy of unclosed equations for the probability density function and its Fourier transform\, the characteristic function\, that accounts for both flow and thermodynamics statistics. Then\, the Lie point symmetries of the characteristic function hierarchy are derived. Finally\, the symmetry groups are used to obtain the scaling laws for channel flows\, and are verified against the data from direct numerical simulations.\nThe second part of the talk focuses on understanding the large-scale meridional structure of vertical vorticity in the intertropical convergence zone (ITCZ)\, the near-equatorial region where the trade winds converge and produce a planetary-scale band of precipitation. We show that the vorticity away from the latitude of the ITCZ can be understood approximately through conservation of absolute vorticity\, whereas\, within the ITCZ\, vortex stretching plays a dominant role. As a result\, the relative vorticity in the ITCZ increases as the ITCZ moves poleward.\n\nSpeaker: Dr. Divya Sri Praturi\n\nBiography :\nDivya Sri Praturi is a postdoctoral researcher at the Max Planck Institute for Meteorology\, Hamburg. She obtained her PhD in Aerospace Engineering from Texas A&M University\, College Station\, USA\, and Bachelors and Masters degrees in Aerospace Engineering from the Indian Institute of Technology\, Kharagpur. She was also a recipient of the Humboldt Fellowship for postdoctoral researchers and Amelia Earhart Fellowship for PhD students. Her research interests lie broadly in the areas of tropical atmospheric and climate dynamics\, stability and turbulence in conducting and non-conducting compressible shear flows. She employs pen-and-paper calculations\, group theoretical methods and high resolution numerical simulations to derive mechanistic insights into these flows.
URL:https://aero.iisc.ac.in/event/fluid-dynamics-across-scales-insights-from-compressible-turbulence-and-large-scale-tropical-atmospheric-dynamics/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/png:https://aero.iisc.ac.in/wp-content/uploads/2026/05/Dr-Divya-May22-4.png
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260525T150000
DTEND;TZID=Asia/Kolkata:20260525T170000
DTSTAMP:20260615T110535
CREATED:20260513T082319Z
LAST-MODIFIED:20260519T083011Z
UID:10000125-1779721200-1779728400@aero.iisc.ac.in
SUMMARY:Deception and Risk-Sensitive Behaviors in Games with Asymmetric Information: A Pursuit-Evasion Case Study
DESCRIPTION:Abstract: Games with asymmetric information involve situations where one player possesses knowledge that the other player does not. This is particularly evident in military engagements\, where the “fog of war” plays a critical role in the decision-making process. In such scenarios\, two distinct behaviors can be observed. The more informed player tends to adopt deceptive strategies aimed at imposing losses on the opponent. Conversely\, the less informed player seeks to mitigate losses caused by the information disadvantage by adopting a risk-averse strategy.\nIn this talk\, we present a novel approach for the more informed player to incorporate deception in a two-agent differential game with asymmetric information. We propose sensitivity function-based risk estimates for the less informed player to effectively address the information disadvantage. The efficacy of the proposed techniques is demonstrated through a pursuit-evasion case study involving a pursuer\, an evader\, and a moving obstacle whose exact position and velocity are known only to one of the players (the evader in this case). Finally\, we explore the relevance of deception for the evader using the concept of dependent reachable sets. \nSpeaker : Dr. Venkata Ramana Makkapati \nBiography: \nDr. Venkata Ramana Makkapati is currently working at Honda Aircraft Company as an AFCS & Advanced Research Engineer. His research interests include optimal control and differential games\, with a focus on autonomous vehicles\, safe path planning\, and airspace security. He received his B.Tech. from IIT Madras in 2014 and M.Tech. from IIT Kanpur in 2016\, both in Aerospace Engineering. He obtained his Ph.D. in Aerospace Engineering and an M.S. in Computational Science and Engineering from the Georgia Institute of Technology\, Atlanta\, USA. Ramana is an FAA-certified Private Pilot and holds the United States Parachute Association (USPA) A license. \n  \nLink: https://teams.microsoft.com/meet/43166057134136?p=TqzW03cjZvsMTgCwMN\nMeeting ID: 431 660 571 341 36\nPasscode: Yw6Ab2NU
URL:https://aero.iisc.ac.in/event/deception-and-risk-sensitive-behaviors-in-games-with-asymmetric-information-a-pursuit-evasion-case-study/
LOCATION:Online
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2026/05/Venkata.jpg
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