The unstructured-grid mixed-element cell-centered finite-volume flow solver USM3D is enhanced for massively parallel computations. The paper describes modifications to the flow solver and parallelization strategy. The new parallel implementation is verified through comparison of residuals and force coefficients computed on a given grid using varying number of partitions. The accuracy of the parallel USM3D is verified through grid convergence studies and comparison with available reference solutions for two benchmark turbulent flows, namely, a subsonic separated flow around a three-dimensional hemisphere-cylinder configuration and a supersonic flow through a square duct. The strong and weak scalability assessments are conducted using two different nonlinear iteration methods.

非结构化网格混合元素以单元为中心的有限体积流量求解器 USM3D 已针对大规模并行计算进行了增强。该论文描述了对流求解器和并行化策略的修改。新的并行实现是通过比较使用不同数量的分区在给定网格上计算的残差和力系数来验证的。并行 USM3D 的准确性通过网格收敛研究和与两个基准湍流的可用参考解决方案的比较得到验证，即围绕三维半球-圆柱结构的亚音速分离流和通过方形管道的超音速流。使用两种不同的非线性迭代方法进行强和弱可扩展性评估。