Exafsa: Parallel fluid-structure-acoustic simulation

Abstract

In this paper, we present results of the second phase of the project ExaFSA within the priority program SPP1648—Software for Exascale Computing. Our task was to establish a simulation environment consisting of specialized highly efficient and scalable solvers for the involved physical aspects with a particular focus on the computationally challenging simulation of turbulent flow and propagation of the induced acoustic perturbations. These solvers are then coupled in a modular, robust, numerically efficient and fully parallel way, via the open source coupling library preCICE. Whereas we made a first proof of concept for a three-field simulation (elastic structure, surrounding turbulent acoustic flow in the near-field, and pure acoustic wave propagation in the far-field) in the first phase, we removed several scalability limits in the second phase. In particular, we present new contributions to (a) the initialization of communication between processes of the involved independent solvers, (b) optimization of the parallelization of data mapping, (c) solver-specific white-box data mapping providing higher efficiency but less flexibility, (d) portability and scalability of the flow and acoustic solvers FASTEST and Ateles on vector architectures by means of code transformation, (e) physically correct information transfer between near-field acoustic flow and far-field acoustic propagation.