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UID:56@cds.iisc.ac.in
DTSTART;TZID=Asia/Kolkata:20240611T100000
DTEND;TZID=Asia/Kolkata:20240611T110000
DTSTAMP:20240610T175831Z
URL:https://cds.iisc.ac.in/events/seminar-cds-202-11th-june-large-small-ed
 dy-simulations-a-practical-method-for-high-fidelity-simulations-of-large-r
 eynolds-number-turbulent-flows/
SUMMARY:{Seminar} @ CDS: #202: 11th June: "Large/Small Eddy Simulations: A 
 practical method for high-fidelity simulations of large Reynolds number tu
 rbulent flows."
DESCRIPTION:Department of Computational and Data Sciences\nDepartment Semin
 ar\n\n\n\nSpeaker : Arnab Moitro\, PhD Candidate\, University of Connectic
 ut\, USA\nTitle : Large/Small Eddy Simulations: A practical method for hig
 h-fidelity simulations of large Reynolds number turbulent flows.\nDate &am
 p\; Time : June 11\, 2024\, 10:00 AM\nVenue : # 202\, CDS Classroom\n\n\n\
 nABSTRACT\nTurbulent flows are ubiquitously found in nature and engineerin
 g systems and are characterized b chaotic fluctuations spanning a wide r
 ange of interacting scales. Numerical simulation of turbulent flows from f
 irst principles using direct numerical simulations (DNS) is computationall
 y expensive and restricted to moderate Reynolds numbers in idealized domai
 ns\, decoupled from any realistic large-scale flow. On the other hand\, lo
 wer fidelity techniques such as large eddy simulations (LES)\, used for mo
 delling practical and natural systems rely on closure models that make mul
 tiple assumptions which are often violated and require prior knowledge of 
 the flow. In this talk\, a novel multi-fidelity approach will be discussed
  which couples a lower-fidelity\, unresolved\, time-dependent calculation 
 of the entire system (LES)\, and a high-fidelity\, fully resolved simulati
 on of a sub-region of interest of the LES. The method is formulated in phy
 sical space\, makes no assumptions of equilibrium\, isotropy\, initial or 
 boundary conditions of the underlying flow\, and can potentially be used f
 or any regime whose properties are unknown. A priori and posteriori tests 
 of both steady and unsteady homogeneous\, isotropic turbulence are used to
  demonstrate the method accuracy in recovering turbulence properties\, inc
 luding spectra\, high order moments of velocity gradients\, and probabilit
 y density functions of the intermittent quantities. The method is shown to
  achieve DNS-level accuracy with three orders of magnitude reduction in co
 mputational cost\, thus opening the possibility to study high Reynolds num
 ber flow regimes.\n\nBIOGRAPHY\nArnab Moitro is a PhD candidate in the Sch
 ool of Mechanical\, Aerospace and Manufacturing Engineering at the Univers
 ity of Connecticut. Prior to this\, he received his dual degree (BTech+MTe
 ch) from Indian Institute of Technology\, Madras and also worked as a rese
 arch associate at Indian Institute of Science\, Bangalore. He will be join
 ing Newcastle University as a post-doctoral research associate in July 202
 4. His work focusses on high- and multi-fidelity simulations and modelling
  of turbulent reacting and non-reacting flows.\n\nHost Faculty: Dr. Kondur
 i Aditya\n\n\n\nALL ARE WELCOME
CATEGORIES:Events,Talks
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