Department of Computational and Data Sciences
Department Seminar
Speaker : Dr. John. P. John
Title : “Compressible Turbulence and Mixing: From Homogeneous Isotropic to Convective Turbulence”
Date & Time : December 12, 2023, 10:30 AM
Venue : # 102, CDS Seminar Hall
ABSTRACT
Compressible turbulence and turbulent mixing play a critical role in diverse systems ranging from engineering devices to astrophysics. Attempts to make progress using traditional governing parameters, namely the Taylor Reynolds number (Rλ) and the turbulent Mach number (Mt) have been marred with inconsistencies and conflicting results in the literature. Combining a massive DNS database and a novel asymptotic theoretical approach, we identify a new nondimensional scaling parameter, δ, the ratio of compressible to vortical strength. This parameter along with traditional parameters is used to unravel universal behaviour and scaling laws resolving several major issues. Results include division of the δ − Mt phase into different physical regimes, scaling of spectra, dissipative anomaly and passive scalar mixing in compressible turbulence. Finally some exciting new results on fully compressible convection going beyond the commonly used Boussinesq and anelastic approximations will be reported.
BIOGRAPHY
Dr John Panickacheril John is currently a Alexander von Humboldt postdoctoral fellow at the Institute of Thermodynamics and Fluid Mechanics, Technische Universit¨at, Ilmenau. His research interests are in compressible turbulence, convection and dispersed compressible multiphase turbulence using a combination of theory and high-fidelity direct numerical simulations. He completed his undergraduate studies in mechanical engineering from National Institute of Technology, Calicut. He did his masters and Ph.D in aerospace engineering from Purdue University and Texas A & M university respectively.
Host Faculty: Dr. Konduri Aditya
ALL ARE WELCOME
