Performance of Vector/Parallel Orientated Hydrodynamic Code

Summary

We have developed a hydrodynamic 3 dimensional AMR code which is suitable for vectorization and parallelization based on Fully Threaded Tree method. For the case of 3D FTT-AMR simulation, the number of higher resolution cells is eight times of that of mother low resolution cells. Therefore if the region where the highest resolution is required has certain volume, it is better to use single time step for every levels of resolution because we can avoid artificial flow at the surface of resolution interface. This level-independent time step also makes possible to simplify the evaluation of refinement indicator. As a result, we can overcome the demerit of consuming CPU time by computing at level-independent time step less than CFL limit, by boosting vector acceleration ratio.