This work is part of the exaFOAM project that aims to enable the open-source CFD software OpenFOAM to exploit massively parallel HPC architectures and overcome performance scaling bottlenecks. The ERCOFTAC conical diffuser is a challenging case for turbulence modeling since it operates in the flow regime close to separation at the diffuser wall. Depending on the turbulence model the simulation may predict separation producing results, which do not correspond to the experimental ones. This is shown in the description of the RAS microbenchmark based on the low Reynolds k-omega-SST turbulence model. Here, an additional setup and corresponding microbenchmark incorporating an LES model is proposed. Detailed information and case setup can be found in the README.md file contained in the case setup file.

OpenFOAM, v2106

The case setup in DaRUS is a snapshot (commit 1dcdaace8bc3135679dea3db3c56fb24404c456f) from the code repository of the OpenFOAM High Performance Computing Technical Committee https://develop.openfoam.com/committees/hpc/-/tree/develop/incompressible/pimpleFoam/LES/conicalDiffuser