Dimaxer: A Fast High Order Unsteady Simulating System on GPUs for Turbomachinery

Abstract The space-time extension kinetic energy preserving flux reconstruction method (STE-KEP-FR) and the “Magazine” type computational model can achieve fast solution of high-order accuracy large eddy simulation (LES) on small-scale machine GPUs. In this paper, a completely autonomous CFD industrial software Dimaxer developed based on this method is used to perform 5th order accuracy LES on typical turbomachinery flow cases such as VKI LS59, VKI LS89, T106C, S809, and flat plate film cooling with cylindrical hole to assess the solution speed. As well as LES on coarse and fine meshes with lower order schemes are conducted on VKI LS59 and VKI LS89 to study the requirement of the mesh and order under a given error tolerance. All the simulations are conducted on multiple Nvidia-RTX4090 desktop GPUs. The results show that for typical flow problems of turbomachinery with Renolds number ranging from hundreds to millions, wall-resolved LES numerical simulation can be achieved at an affordable computational cost (∼1 GPU hour), showing good industrial application prospects.