Russell Edward Quadros

  • Shock-turbulence interaction.
  • Linear Inviscid Analysis.
  • RANS modeling.

1. Quadros, R. and Sinha, K., "Modelling of turbulent energy flux in canonical shock-turbulence interaction", International Journal of Heat and Fluid Flow, Volume 61, Part B, pp. 626-635, October 2016.

2.Quadros, R., Sinha, K. and Larsson, J. "Turbulent energy flux generated by shock/homogeneous-turbulence interaction", Journal of Fluid Mechanics, Volume 976, pp. 113-157, June 2016.

3. Quadros, R., Sinha, K. and Larsson, J. "Kovasznay Mode Decomposition of Velocity Temperature Correlation in Canonical Shock-Turbulence Interaction", Flow, Turbulence and Combustion, Volume 97, Issue 3, pp. 787-810, October 2016.

4. Quadros, R., and Sinha, K., "Modeling of Turbulent Energy Flux in Canonical Shock- Turbulence Interaction", Ninth International Symposium on Turbulence and Shear Flow Phenomena TSFP-9, Melbourne, Australia, June 30-July 3, 2015.

5. Quadros, R. and Sinha, K., "Physics Based Modeling of Turbulent Heat Flux in Shock Dominated Flows.", 2nd SFB-TR 40 Summer Program Research Briefs, Garching, Munich, Germany, July 2013.

  • Ph.D, Dept. Of Aerospace Engineering, IIT Bombay. 2009-Present.
  • M.Tech, Dept. Of Aerospace Engineering, IIT Kharagpur. 2007-2009
  • B. Eng., Dept. Of Mechanical Engineering, SJCE Mysore. 2001-2005

2005-2007: Design engineer - TATA Consultancy.

With the recent increase in need for supersonic vehicles (space crafts, scramjet technologies, supersonic fighter jets etc.), it has become imperative to study the challenges faced in designing such vehicles. Due to presence of shock waves, high pressure and heat loads are seen on the surface of such vehicles. The turbulence existing in the boundary layer interacts with the shock wave to further increase the wall pressure and wall heat flux. This interaction of turbulence with shock-waves, can be best studied in a canonical framework which consists of a homogeneous isotropic turbulence passing through a normal shock wave.

The intention of such a study would be not only to gain insight into the underlying physics but also to develop suitable RANS modelling capabilities that can improve CFD predictions of practical configurations. One such exercise was undertaken by Sinha et al. (2003) to study the turbulent kinetic energy (TKE) amplification across the shock in canonical configuration and propose a modification in RANS framework to better capture the TKE evolution across the shock wave. This modification was further extended to several practical geometries such as compression ramp, hypersonic cone flare configuration, oblique shock impingement etc. (Sinha et al. 2005, Amjad and Sinha 2008, Amjad and Sinha 2012 ). A similar study of dissipation rate in canonical configuration has led to improved CFD predictions in practical geometries (Sinha 2012).

The modification suggested by these models were aimed at improving the aerodynamic loading predictions. Significant improvements in prediction of wall pressure and separation region size was observed. The ongoing work focusses mainly on developing a model to better predict the wall heat flux. In order to attain our objective, we have studied an important unclosed term in RANS framework i.e. turbulent energy flux. This term has been seen to have significant effect on wall heat flux especially in shock dominated flows and its correct modelling is crucial in improving the wall heat flux predictions. Firstly, we have studied the physics of turbulent energy flux evolution in the canonical shock-turbulence interaction framework using LIA (a theoretical tool for studying shock turbulence interaction) and DNS data from Prof. Johan Larsson (University of Maryland). Further, a suitable model has been developed in 1D RANS framework. The application of such a study in SBLI context is also explored (Work to be submitted).

References

  1. Sinha, K., Mahesh, K. & Candler, G. V. 2003 Modeling shock-unsteadiness in shock/turbulence interaction. Phys. Fluids 15, 2290–2297.
  2. Sinha, K., Mahesh, K. & Candler, G. V. 2005 Modeling the effect of shock unsteadiness in shock-wave / turbulent boundary layer interactions. AIAA Journal 43, 586–594.
  3. Pasha, A. A. & Sinha, K. 2008 Shock-unsteadiness model applied to oblique shock-wave / turbulent boundary layer interaction. Int. J. Comput. Fluid Dyn. 22, 569–582.
  4. Pasha, A. A. & Sinha, K. 2012 Shock-unsteadiness model applied to hypersonic shock-wave /turbulent boundary-layer interactions. Journal of Propulsion and Power 28, 46–60.
  5. Sinha, K. 2012 Evolution of enstrophy in shock/homogeneous turbulence interaction. J. Fluid Mech. 707, 74–110.
  6. Generation of turbulent energy flux by vortical turbulence interacting with a normal shock. To be submitted to J. Fluid Mech.


Mail : russell@aero.iitb.ac.in