Available on-line at www.prace-ri.eu Partnership for Advanced Computing in Europe OpenMP Parallelization of the Slilab Code

This white paper describes parallelization of the Slilab code with OpenMP for a shared-memory execution model when focusing on the multiphase phase flow simulations, such as fiber suspensions in turbulent channel flows. In such problems the motion of the ”second phase fibre” is frequently crossed over the distributed domain boundary of the ”first phase fluid”, which in turn reduces the work-balance between the MPI ranks. The addition of OpenMP parallelization allows to minimize the number of MPI ranks in favor of a single-node parallelism, therefore mitigating MPI imbalance. With OpenMP parallelism in place, we also analyze performance of Slilab on Intel XeonPhi.