Improved physical understanding and modeling - DES/LES & PIV
S. Illi, Th. Lutz and E. Krämer, CFD and Experiment – Integration of Simulation, Göttingen, Germany, April 5th - 6th, 2011
Abstract:
The Reynolds averaged NavierStokes methods (RANS) are the state of the art technique in modern computational fluid dynamics (CFD) at the present day. All turbulent fluid dynamic effects are replaced by one turbulence model and because of the origin of the equations only the time averaged values can be obtained. Due to the increasing speed of supercomputers and the development of more sophisticated measurement methods like particle image velocimetry (PIV), time resolved simulations of turbulent flows became more interesting over the last years. While PIV made its way in experiments, large eddy simulation (LES) for the numerical simulation of turbulent flows has been applied to many problems only RANS methods were typically used for. Although wall resolved LES of complete aircrafts will not be available in this decade, so called hybrid RANSLES methods seem to obtain good results in many applications.
