Mitue Den

Performance of Vector/Parallel Orientated Hydrodynamic Code

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.

Performance of Adaptive Mesh Refinement Scheme for Hydrodynamics on Simulations of Expanding Supernova Envelope

We present results of performance measurement of our astrophysical fluid dynamics code with Adaptive Mesh Refinement (AMR) scheme. As an example of its application for astrophysical phenomena, we show the results of 3D simulation of Rayleigh-Taylor instability in expanding supernova envelope and the possibility of reconciliation of the present model with observations. The efficiency of memory and CPU-time savings is discussed and measured with this simulation. Its result shows that our code has the ability to simulate phenomena with wide dynamic ranges even in limited computing resources.