Along with CAVS computational engineers, Dr. Shanti Bhushan is involved in the development of advanced turbulence model for CFD simulations. The key ongoing projects include:
Algebraic LES Model: The model is derived from the deductive iteration of the subgrid scale stress transport constitutive equations. The model has an additional term over the mixed model, which accounts for an independent modeling of the backscatter. The model coefficients have been evaluated both analytically and using dynamic approach.
Dynamic Hybrid RANS/LES (DHRL) model: The DHRL model represents significant differences with more commonly used approaches, including:
Isosurfaces of Q criterion showing the vortical structures predicted by DES (LEFT) and DHRL (RIGHT) for SUB-OFF
Identification of Large Scale Bypass Transition Onset marker: Bypass transition flow physics is one of the least understood problems in fluid mechanics, with researchers and engineers wrestling with it for decades. One of the primary hurdles in the development of physics-based models is the lack of proper understanding of the turbulence dynamics in the transition boundary layer. This research aims to improve the understanding using systematic high-fidelity DNS studies, and by focusing on TKE and stress budget analysis.
Vortical structures show the generation of Klebanoff modes in pre-transition region, and hairpin structures during transition.