Prahladh Iyer

Education

• Ph.D., University of Minnesota, 2015
• B. Tech, National Institute of Technology Karnataka, India, 2008

Work Experience

• Research Scientist, National Institute of Aerospace, November 2017 – present
• Research Scholar, National Institute of Aerospace, May 2015 – November 2017
• Postdoctoral Fellow, University of Minnesota, Feb 2015 – May 2015

Research Areas/Expertise

• Computational Fluid Dynamics
• Turbulence Modeling and Simulation
• Stability and Transition to Turbulence
• Numerical Methods for Complex Geometries

Current Research

Wall-modeled Large-Eddy Simulation of Turbulent Separated Flows

Low-fidelity Reynolds-Averaged Navier-Stokes (RANS)-based methods have limited accuracy for complex fluid flows involving separation such as an aircraft wing at high angle of attack. Wall-modeled Large Eddy Simulation (WMLES) resolves the flow scales away from the wall, while modeling the region very near the wall. It is being applied to various benchmark CFD problems of interest to NASA and the aerospace industry to assess its predictive ability. Preliminary results are encouraging, although, further improvements are needed in the wall models before being applied to realistic applications of interest.

Publications

Iyer, P. S. & Malik, M. R. 2018 Large-Eddy Simulation of Axisymmetric Compression Corner Flow.      2018 Fluid Dynamics Conference, Atlanta, Georgia, AIAA Paper 2018-4031.

Iyer, P. S., Park. G. I. & Malik, M. R. 2017 Wall-Modeled Large Eddy Simulation of Transonic Flow over an Axisymmetric Bump with Shock-Induced Separation. 23rd AIAA Computational Fluid Dynamics Conference, Denver, Colorado, AIAA Paper 2017-3953.

 Iyer, P. S., Park. G. I. & Malik, M. R. 2016 A comparative study of wall models for LES of turbulent separated flow. Proceedings of the Center for Turbulence Research Summer Program 2016.

 Iyer, P. S. & Malik, M. R. 2016 Wall–modeled Large Eddy Simulation of Flow Over a Wall–mounted Hump. 46th AIAA Fluid Dynamics Conference, Washington, D.C., AIAA Paper 2016-3186.

Iyer, P. S. & Mahesh, K. 2016 A numerical study of shear layer instability in low-speed jets in crossflow.  J. Fluid Mech., Volume 790, pp. 275-307.

Chai, X., Iyer, P. S., & Mahesh, K. 2015 Numerical study of high speed jets in crossflow.                          J. Fluid Mech., Volume 785, pp. 152-188.

 Iyer, P. S. & Mahesh, K. 2013 High-speed boundary-layer transition induced by discrete roughness elements. J. Fluid Mech., Volume 729, pp. 524-562

Bathel, B., Iyer, P. S., Danehy, P. M., Inman, J. A., Jones, S. B., Mahesh, K. & Johansen,C. 2014 Comparing Experiment and Computation of Hypersonic Laminar Boundary Layers with Isolated Roughness. 52nd Aerospace Sciences Meeting, AIAA SciTech Forum, National Harbor, Maryland, AIAA Paper 2014-0236.

Iyer, P. S., Muppidi, S. & Mahesh, K., 2012 Boundary layer transition due to roughness. 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Nashville, Tennessee, AIAA Paper 2012-1106.

 Iyer, P. S., Muppidi, S. & Mahesh, K., 2011 Roughness-induced transition in high-speed flows. 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Orlando, Florida, AIAA Paper 2011-0566.

 Iyer, P. S., Muppidi, S. & Mahesh, K., 2010 Transition in hypsersonic flow due to roughness elements. 40th Fluid Dynamics Conference and Exhibit, Chicago, Illinois, AIAA Paper 2010-5015.

Selvakumar, M., Bhat, D. K., Aggarwal, M., Iyer, P. S. & Sravani, G., 2010 Nano ZnO-activated carbon composite electrodes for supercapacitors. Physica B: Physics of Condensed Matter, Volume 405, Issue 9, p. 2286-2289.