Shock wave turbulent boundary layer interaction is one of the practical problems of interest in aerospace industry and is widely studied for its significance in hypersonic re-entry vehicles and supersonic intakes. However, this problem is usually decomposed into simple problems to isolate specific effects and for easy understanding of the physical processes. Canonical shock turbulence interaction is one such problem which clearly shows the effects of the shock and the turbulence on each other.

My research is on the study of isotropic turbulence interacting with a normal shock wave. The emphasis is on the thermodynamic fluctuations generated behind the shock wave. Direct numerical simulations (DNS) of this canonical problem have been carried out using the "hybrid" code developed by Prof. Johan Larsson (University of Maryland). The amplification and the evolution of thermodynamic fluctuations are investigated using DNS. The analytical tool "Linear Interaction Analysis" (LIA) which provides the theory to decompose turbulence into its three fundamental modes (Kovasznay modes) - acoustic, vorticity and entropy in the linear limit is also used.

The linear theory is used to provide a theoretical basis for the underlying physical mechanisms responsible for the post-shock evolution of thermodynamic fluctuations. Budgets of the terms in the transport equations of the thermodynamic quantitites provided insight into the physical mechanisms responsible for their post-shock evolution. The understanding from the detailed study has been extended to develop predictive models for the thermodynamic fluctuations. The predictive models are based on the works of Sinha et al., Phys. Fluids, 2003 and Quadros & Sinha, Int. J. Heat Fluid Flow, 2016. The models are found to predict the DNS profiles for a range of Mach number.

1. Sethuraman, Y. P. M., Sinha, K., and Larsson, J.: Thermodynamic Fluctuations in canonical shock-turbulence interaction: effect of shock strength. Theor. Comput. Fluid Dyn., 32(5), 629--654, 2018.

2. Yogesh Prasaad, M. S., and Sinha, K.: Effect of turbulent Mach number on the thermodynamic field generated by a shock wave. In: Proc. of the 2017 Summer Progr., pp. 195 – 207, Munich, Germany, July--August, 2017.

3. Yogesh Prasaad, M. S., Sinha, K., and Larsson, J.: Thermodynamic fluctuations in canonical shock-turbulence interaction. In: Tenth Int. Symp. on Turbul. and Shear Flow Phenom. (TSFP10), pp.8C--4, Chicago, USA, July, 2017.

4. Palash A. Sashittal, Yogesh Prasaad Madras Sethuraman, Johan Larsson, and Krishnendu Sinha, "Study of unsteady shock motion in shock/turbulence interaction," 7th AIAA Theoretical Fluid Mechanics Conference, American Institute of Aeronautics and Astronautics, 2014.

B.E. in Aeronautical Engineering.

Air Safety Consultant in DAS, DGCA, Chennai (December 2010 - July 2011), JRF in CSIR-CEERI, Chennai (August 2011 - July 2012)

Incompressible turbulence, Stability analysis, Numerical/CFD techniques in DNS/LES/RANS, Flow visualization, Combustion and Aeroacoustics