Title: Simulation of compressible, reacting flows in complex geometries

Speaker: Krishnan Mahesh, University of Minnesota

Date/Time: Wednesday, August 29, 2007, 1:00 – 2:00 pm

Location: CSRI Building/Room 95

Brief Abstract: Direct numerical (DNS) and large-eddy simulation (LES) have traditionally been restricted to fairly simple geometries. This talk will discuss our work on developing the capability to reliably perform such simulations in engineering configurations. Special attention has been paid to ensuring robustness and accuracy at high Reynolds numbers without numerical dissipation. The first part of the talk will discuss an algorithm that we have developed (Doom, Hou \& Mahesh, Accepted for publication in {\it J. COmput. Phys.}) for compressible reacting flows using complex chemical mechanisms. Results for hydrogen-air combustion will be shown. The second part of the talk will discuss issues relevant to discretization of compressible flows on unstructured grids. The talk will focus on three issues: discretization of the nonlinear and viscous terms, shock--capturing, and subgrid modeling.