exaFOAM Microbenchmark MB10 - ERCOFTAC conical diffuser LES

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.

本研究隶属于exaFOAM项目，该项目旨在推动开源计算流体动力学（Computational Fluid Dynamics, CFD）软件OpenFOAM适配大规模并行高性能计算（High Performance Computing, HPC）架构，并突破性能缩放瓶颈。ERCOFTAC锥形扩压器是湍流建模领域极具挑战性的测试案例，其运行工况接近扩压器壁面的流动分离区域。不同湍流模型对该案例的分离现象预测结果可能存在偏差，无法与实验数据吻合，这一点在基于低雷诺数k-ω-SST湍流模型的雷诺平均模拟（Reynolds-Averaged Simulation, RAS）微基准测试程序的说明中已有体现。本文在此基础上，提出了一种搭载大涡模拟（Large Eddy Simulation, LES）模型的额外仿真配置方案及对应的微基准测试程序。详细的相关信息与仿真配置说明，可查阅案例文件中包含的README.md文档。