TY - JOUR
T1 - Parallel Domain Decomposition-Based Solver for the Simulation of Flow over an Ahmed Reference Model
AU - Yan , Zhengzheng
AU - Chen , Rongliang
AU - Wang , Chao
AU - Xu , Lei
AU - Li , Jingzhi
JO - Advances in Applied Mathematics and Mechanics
VL - 3
SP - 769
EP - 785
PY - 2023
DA - 2023/02
SN - 15
DO - http://doi.org/10.4208/aamm.OA-2022-0147
UR - https://global-sci.org/intro/article_detail/aamm/21449.html
KW - Aerodynamics, Ahmed model, full Navier-Stokes equations, Newton-Krylov-Schwarz algorithm, parallel computing.
AB - <p style="text-align: justify;">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 subgrid-scale (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.</p>