A Contribution to CESE method validation

Since LS-DYNA r7, a new CESE method is available. Several finite element studies were performed by DynaS+ to evaluate the precision of this method in pure CFD studies and to confirm good abilities in Fluid Structure Interaction studies. Firstly, pure fluid cases were tested on strong shocks and expansion studies. Results were compared to experimental data extracted from reference papers. The good accuracy obtained with the CESE solver and its ability to represent very dynamic phenomenon will be shown. Secondly, Fluid Structure Interaction in 2D was tested with a piston model. Results (also compared with experimental data extracted from a reference paper) will be presented and will highlight that the Coupling method in 2D is as efficient as in 3D. Finally, a last study of a shock wave propagation with structure interaction in tunnels has been performed. The goal of this study was to evaluate CESE capabilities on models with several millions of element. We will discuss in this paper memory aspects (memory needs, decomposition,…) and other important points for an industrial use of CESE method like the time of calculation.