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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:20260428T110000
DTEND;TZID=Asia/Kolkata:20260428T130000
DTSTAMP:20260505T092513
CREATED:20260424T080555Z
LAST-MODIFIED:20260426T092339Z
UID:10000122-1777374000-1777381200@aero.iisc.ac.in
SUMMARY:Experiments on a fluidic pinball: wake dynamics in the chaotic regime
DESCRIPTION:Over the past decade\, the fluidic pinball has become a valuable benchmarkfor studying flow control strategies. The configuration consists of three independently rotating cylinders positioned at the vertices of an equilateral triangle\, with the flow directed perpendicularly to one of its sides. The cylinder rotation rates serve as the control inputs\, while velocity sensors located in the wake provide the outputs. Despite its geometric simplicity\, the wake behind the fluidic pinball displays complex interactions of multiple frequencies and nonlinear dynamics\, making it an excellent test case for the development and evaluation of control laws. While numerous studies have been performed numerically at low Reynolds numbers\, experimental literature is limited\, mainly due to the associated engineering challenges. \nThis study presents the findings from wind tunnel experiments on a fluidic pinball in the chaotic regime (1333 ≤ Re ≤ 3333). Planar two-component particle image velocimetry (PIV) is employed to capture the velocity field while the velocity time traces are obtained from hot-wire anemometry and laser Doppler velocimetry (LDV). The stochastic bistable dynamics in the wake is characterized and its sensitivity to external disturbances is demonstrated. Coherent structures in the wake along with the associated temporal dynamics and their physical implications are analyzed for both the stationary pinball and the flow with steady\, open-loop forcing. The effect of blockage and evolution of 3D structures in the forced wake is discussed. A brief overview of the architecture set up for real-time control is also presented. \nSpeaker : Dr. Aditya Desai \nBiography : \nDr. Aditya Desai is a post-doctoral researcher at the Laboratory of Interdisciplinary Numerical Sciences (LISN)- CNRS\, Orsay\,France working towards Reinforcement Learning-based control of a fluidic pinball. He completed his Master’s and PhD from the Department of Aerospace Engineering\, IIT Kanpur. His research interests are in the domain of experimental aerodynamics\, reduced order modelling and flow control\,  wakes\, vortex induce vibration and sports aerodynamics. He completed his BTech in Aerospace Engineering at IITK in 2009. \n  \n 
URL:https://aero.iisc.ac.in/event/xperiments-on-a-fluidic-pinball-wake-dynamics-in-the-chaotic-regime/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2026/04/Aditya.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260429T110000
DTEND;TZID=Asia/Kolkata:20260429T130000
DTSTAMP:20260505T092513
CREATED:20260424T045758Z
LAST-MODIFIED:20260426T090236Z
UID:10000121-1777460400-1777467600@aero.iisc.ac.in
SUMMARY:Precision in Flow: Advances in PIV\, Hematology\, and High-Heat Flux Cooling for Power Dense Electronics
DESCRIPTION:This talk presents a comprehensive overview of advanced fluidic and thermal management strategies across biomedical and defense applications. We begin with a systematic evaluation of Particle Image Velocimetry (PIV)\, specifically addressing the challenges of simultaneous velocity and particle size measurement. By analyzing Gaussian intensity variations across the light sheet and the optical system’s depth of field\, we propose a balanced methodology for achieving consistent\, high-fidelity size estimates.\nBuilding on these measurement techniques\, we discuss phase-locked PIV studies conducted within a pulsatile flow loop of a ‘mitral’ model bileaflet mechanical heart valve (MHV). The localized jets\, steep velocity gradients\, and vortex recirculation zones identified in vitro provide critical correlations to in-vivo platelet aggregation\, highlighting the intersection of fluid mechanics and clinical pathology.\nThe discussion then shifts to the pivotal role of fluidic design in next-generation whole blood cell analyzers\, utilizing hydrodynamic focusing and sheath flow to optimize optical flow cell performance for hematology. Finally\, we conclude with a high-level summary of mission-critical work in energy storage and high-heat flux cooling. These technologies are essential for the thermal management of power-dense electronics and 3D Heterogeneous Integration (3DHI)\, ensuring reliability in the next frontier of microelectronic architecture.\n\nSpeaker : Dr. Ganesh Subramanian\n\n Biography:\nDr. Ganesh Subramanian is a technical leader and program/functional manager with over 20 years of experience bridging fundamental research and mission-critical engineering. An IISc Aerospace PhD and certified PMP/Agile professional\, he has led a diverse portfolio of high-priority energy storage and thermal management programs funded by the U.S. DoD and DARPA\, while at Teledyne Technologies. He has had a decade-long tenure\, each at Abbott and BD Biosciences\, developing fluidic and thermal subsystems for hematology instruments and flow cytometers. His career is grounded in high-impact fluid dynamics research working jointly with NASA and the Cleveland Clinic\, combining academic rigor with a proven track record of leadership in highly regulated defense and medical sectors.
URL:https://aero.iisc.ac.in/event/precision-in-flow-advances-in-piv-hematology-and-high-heat-flux-cooling-for-power-dense-electronics/
LOCATION:STC Seminar Hall\, Dept. of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/png:https://aero.iisc.ac.in/wp-content/uploads/2026/04/AE-Seminar-Ganesh-S-29April2026.png
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