Parallel Domain Decomposition-Based Solver for the Simulation of Flow over an Ahmed Reference Model  

作　　者：Zhengzheng Yan Rongliang Chen Chao Wang Lei Xu Jingzhi Li 

机构地区：[1]Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China [2]Faculty of Computational Mathematics and Cybernetics,Shenzhen MSU-BIT University,Shenzhen 518172,China [3]Department of Mathematics&National Center for Applied Mathematics Shenzhen&SUSTech International Center for Mathematics,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Advances in Applied Mathematics and Mechanics》2023年第3期769-785,共17页应用数学与力学进展（英文）

基　　金：The work of Yan was partially supported by the Natural Science Foundation of China under Grant No.11901559;the Shenzhen Sci-Tech Fund Nos.JCYJ20180507182506416 and JCYJ20200109115422828;The work of Li and Wang was partially supported by the NSF of China No.11971221;Guangdong NSF Major Fund No.2021ZDZX1001,the Shenzhen Sci-Tech Fund Nos.RCJC20200714114556020 and JCYJ20190809150413261;Guangdong Provincial Key Laboratory of Computational Science and Material Design No.2019B030301001.

摘　　要：The Ahmed model is a standard bluff body used to study the flow behavior around an automobile.An important issue when investigating turbulent flow fields is the large computational load driven by accurate prediction approaches,such as the large eddy simulation model.In this paper,we present a powerful domain decomposition method-based parallel solver to efficiently utilize existing supercomputer resources.The 3D unsteady incompressible Navier–Stokes equations with a subgridscale(SGS)fluid model are discretized on a pure unstructured tetrahedral grid by a stable P_(1-)P_(1-)finite element method in space,while an implicit second-order backward differentiation formula is employed for the time discretization.We then solve the nonlinear algebraic system by means of the Newton–Krylov–Schwarz method by imposing a restricted additive Schwarz(RAS)right preconditioner for the parallel setting.We validate the proposed method toward the comparison of the flow field,including the velocity profiles and flow structures,with experimental investigations,and we show the parallel efficiency and scalability of the solver with up to 8192 processors.

关 键 词：AERODYNAMICS Ahmed model full Navier-Stokes equations Newton-Krylov-Schwarz algorithm parallel computing 

分 类 号：O24[理学—计算数学]