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