The use of gas-kinetic methods for the simulation of compressible flows has become wide-spread in the two last decades. Among all the gas-kinetic methods, the most promising ones are the Equilibrium Flux Method (EFM), the Kinetic Flux Vector Splitting (KFVS) and the Gas-Kinetic BGK (Bhatnagar, Gross and Krook) method. Due to the inclusion of intermolecular collisions with BGK simplification, the gas-kinetic BGK method provides a more complete and a realistic description of flows and have been well studied. In this paper, the development of a parallel, 3-D flow solver based on a gas-kinetic BGK method on unstructured grids is presented. The method is validated for inviscid, supersonic missile flows successfully. The aerodynamic load predictions for mostly attached flows at angles of attack below 12 degree agree well with the experimental data except for the axial force prediction. The parallel computations are performed in two computer clusters based on AMD Opteron and Intel Itanium2 processors. It is shown that parallel computations improve the computational efficiency of the gas-kinetic BGK method significantly. Such a high parallel efficiency and the improvement in the turn-around time of a flow solution are expected to promote the use of gas-kinetic BGK methods for the solution of practical flow problems.
Parallel implementation of a gas-kinetic BGK method on unstructured grids for 3-D inviscid missile flows
Parallele gaskinetische Simulation der dreidimensionalen reibungsfreien Umströmung von Flugkörpern mit unstrukturierten Gitternetzen
2008
8 Seiten, 8 Bilder, 2 Tabellen, 20 Quellen
Aufsatz (Konferenz)
Englisch
Anstellwinkel (Tragflügel) , Boltzmann-Gleichung , Cluster-Computing , Flugkörper , Gitternetz , kinetische Gastheorie , kompressible Strömung , Luftkraft , mathematisches Modell , numerische Strömungssimulation , numerisches Verfahren , Parallelalgorithmus , Theorie-Experiment-Vergleich , Überschallströmung