Calculation of Flow and Turbulence over Dunes
Dr. Thorsten StoesserAssistant Professor, Civil and Environmental Engineering, Georgia Institute of Technology
Date: Wednesday, April 23, 2008 at 12:00 PM
Room: PARB 239
Abstract
In this talk results of several Large Eddy Simulations (LES) as well as calculations which are based on the Reynolds-Averaged Navier-Stokes (RANS) equations of the flow over two-dimensional dunes at different water depths will be presented. Several turbulence models are used in order to model the Reynolds stresses appearing in the RANS formulation of the governing equations. Detailed comparisons between RANS simulations, LES and experimental data will be shown for several quantities like, velocities, kinetic energy, drag, and friction along the channel bed. These will show that the RANS simulations revealed some weaknesses in accurately predicting the flow however the discrepancies depend on the turbulence closure model employed in the RANS calculations.
Presenter Bio
Dr. Stoesser is an Assistant Professor in the School of Civil and Environmental at the Georgia Institute of Technology, Atlanta. GA. He received his Ph.D. in Civil Engineering from the University of Bristol, UK, in 2002 and earned his Dipl.-Ing. (M.S.) in Civil Engineering from the University of Karlsruhe, Germany, in 1999. Dr. Stoesser joined the faculty in 2006 after a postdoctoral research position at the Institute for Hydromechanics at the University of Karlsruhe. His research interests span a broad range of topics in computational fluid dynamics, open-channel hydraulics and environmental fluid mechanics. Dr. Stoesser is particularly interested in the numerical modeling of turbulence in fluid flow and he has developed advanced CFD models to simulate fluid flow in complex geometries using LES and RANS methodologies.
