Скачать или смотреть Realistic Simulations of the Intergalactic Medium: A Scalable Gravity Solver...

"Realistic Simulations of the Intergalactic Medium: A Scalable Gravity Solver for Enzo-E" - Michael L. Norman

In our continuing quest for more comprehensive models of the intergalactic medium including resolved galaxies, we are developing Enzo-P/Cello (now renamed Enzo-E), the petascale/exascale fork of the popular Enzo cosmological AMR code. Enzo-E employs an array-of-octrees AMR mesh for improved scalability, and is parallelized using Charm++. We report on progress implementing a scalable Poisson solver for Enzo-E for cosmological applications. The solver consists of two steps: in a first step, the global gravitational potential on the uniform based grid is computed using geometric multigrid. In a second step, the local gravitational potential in each octree of the array is solved using a biconjugate gradient method subject to boundary conditions taken from the global mesh. We report on the weak and strong scaling properties of the DD solver, and compare its speed and accuracy to the original Enzo code.