Department of Mechanical Engineering

ME Seminar Series: A Novel CFD Methodology

 

 

 

Department of Mechanical Engineering Seminar Series
11:00 AM– 12:00 PM
October 2, 2007
1227 Hoover Hall

A Novel CFD Methodology

Peyman Givi
William Kepler Whiteford Professor of Mechanical Engineering and Materials Science, University of Pittsburgh

Abstract

Almost all of the current CFD softwares for simulation of turbulence and chemically reactive phenomena are based on Reynolds-averaged Navier-Stokes (RANS) equations. In this method, the solution of the transport equations, averaged over all flow scales, is sought. The popularity of RANS is due to its relatively low computational cost. However, its reliability has always been an issue of major concern since all of the physics associated with turbulence are modeled. Another approach which is starting to find its way into commercial softwares is based on large eddy simulation (LES). In this method, the equations are averaged (or filtered) over the large flows scales. The transport at these scales is solved “directly,” but the effects of small scales are modeled. We have recently developed a methodology which has proven very effective for LES of turbulent flows, especially for those involving chemical reactions. Termed “filtered density function” (FDF), the scheme employs a hybrid deterministic-stochastic procedure for solving the filtered transport equations of turbulent flows. The deterministic component is similar to that involved in standard CFD packages. The stochastic part is a Lagrangian Monte Carlo scheme for solving the probability density function of the subgrid scale quantities.

Biography

Dr. Peyman Givi previously held the position of UB Distinguished Professor at the State University of New York at Buffalo (1988-2002). He has had frequent visiting appointments at NASA and received the Agency's Public Service Medal (2005). Professor Givi is amongst the first 15 engineering faculty nationwide who was honored at the White House to receive the Presidential Faculty Fellowship from President George H.W. Bush (1992). In 1990 he received the Young Investigator Award of the Office of Naval Research, and the Presidential Young Investigator Award of the National Science Foundation (NSF). Dr. Givi has been a member of the editorial boards in Computers & Fluids, Open Aerospace Engineering Journal, Journal of Applied Fluid Mechanics; Associate Editor of AIAA Journal, International Journal of Reacting Systems; and a past advisory board member of Progress in Energy and Combustion Science. He received Ph.D. from the Carnegie-Mellon University (PA) in 1984. Dr. Givi is a Fellow of ASME, an Associate Fellow of AIAA and was named Engineer of the Year by ASME-Pittsburgh.

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