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TZID:Asia/Kolkata
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BEGIN:VEVENT
UID:10@aero.iisc.ac.in
DTSTART:20240304T143000Z
DTEND:20240304T160000Z
DTSTAMP:20240324T071655Z
URL:https://aero.iisc.ac.in/events/nonequilibrium-reacting-flows/
SUMMARY:AE Seminar
DESCRIPTION:Nonequilibrium reacting flows: First principles based modeling 
 for chemical kinetics and hydrodynamics\n\nSpeaker\nDr. Narendra Singh\nPo
 stdoc Research Associate\, Standford University\n\nAbstract\nPredicting st
 ate of the gas hitting vehicles flying at hypersonic speeds (Mach ~5) is c
 hallenging and is an exciting area of research. Hypersonic flows create sh
 ock waves\, which compress and heat the surrounding gas to high-temperatur
 es\, nearly thousands of Kelvins. At these high temperatures\, air molecul
 es (nitrogen and oxygen) dissociate into atomic species. Predicting the ex
 tent of dissociation and recombination of atomic species is important sinc
 e the state of the gas near the vehicle surface determines heating rates a
 nd gas-surface chemistry that damages the heat shield. Since experiments i
 n ground test facilities do not mimic such extreme flight conditions\, num
 erical simulation plays an important role. Predictive numerical simulation
 s require accurate reaction chemistry models. Computational models develop
 ed thus far range from simple empirical models fit to limited experimental
  data to models with millions of input parameters that track individual qu
 antized energy state transitions. The level of model fidelity required for
  accurate engineering analysis remains an open question of active researc
 h. Models coupling internal energy and dissociation chemistry tend to be d
 eveloped at either the kinetic scale or the continuum scale. In this work\
 , we develop new nonequilibrium models for shock heated flows that are an
 alytically consistent between kinetic and continuum scales and are based o
 n recent ab-initio data\, applicable to large-scale CFD and direct simula
 tion Monte Catlo (DSMC) simulations.\n\nNonequilibrium Hydrodynamics: The 
 Navier-Stokes equations\, typically employed even at strong non-equilibriu
 m conditions\, wherein thermodynamic fluxes such as stresses and heat flu
 x vector are based on linear irreversible thermodynamics\, not be accurate
  in multiscale and multiphysics scenarios encountered in hypersonic flows.
  Similarly\, the Navier-Stokes equations are known to breakdown in rarefie
 d (low density) gas flows. Therefore\, a new formalism is proposed to circ
 umvent these issues\, which can also benefit\, hybrid methods that can co
 mbine continuum description using the Navier-Stokes equations and microsco
 pic description\, necessary for efficient high-fidelity numerical simulati
 ons. Other wide range of physics problems such as nano-scale flows\, plas
 ma physics modeling\, and general complex gas flows can also benefit from 
 the proposed new non-equilibrium hydrodynamic formalism.\nBrief Bio of Spe
 aker:\nDr. Narendra Singh graduated with a PhD (and MS) in Aerospace Engin
 eering (with minor in Mathematics and Chemistry) from University of Minnes
 ota. Narendra obtained his undergraduate degree (with Honors) in MechE fro
 m IIT Bombay. In his doctoral thesis\, Narendra developed chemical kinetic
 s models for DSMC and CFD using first principles-based approach. In additi
 on\, Narendra (along with Prof.Agrawal) has developed higher order equatio
 ns for rarefied and strong nonequilibrium flows\, known as O-13 and O-Burn
 ett equations\, where O ‘refers’ to Onsager due to the consistency of 
 equations with Onsager’s reciprocity principle. Narendra Singh did his 2
  years postdoc in MechE at Stanford\, where his research spanned particle-
 laden flows\, carbon sequestration\, and ultrafast chemistry at SLAC. Curr
 ently\, he is a postdoc research associate at Center for Hypersonic\, UIUC
 \, and developing reduced order models for chemical kinetics.
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CATEGORIES:Seminar Series
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