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Incompressible CFD Results Using LS-DYNA. For High Reynolds Number Flow Around Bluff Bodies

This report will provide some insight on the new incompressible CFD solver that will be available in version 980 of LS-DYNA. Several test cases were performed by AS+ in order to evaluate the capabilities of these new solvers. These studies were conducted in cooperation with LSTC’s CFD developers. Among the various test cases, the airflow over the Ahmed body, a simplified car model will be presented. The flow around this body reproduces the basic aerodynamic features of cars on a well defined basic geometry in order to study the complex interactions associated with vortex wakes and boundary layer separation/reattachment zones. Results were compared to experimental data extracted from reference papers. The results shown here are all part of the global validation process of the incompressible CFD solver.