Time-accurate multi-scale anisotropic mesh adaptation for unsteady flows in CFD

被引:27
作者
Alauzet, F. [1 ]
Loseille, A. [1 ]
Olivier, G. [1 ]
机构
[1] INRIA Saclay Ile France, Projet Gamma3, 1 Rue Honore dEstienne dOrves, F-91126 Palaiseau, France
关键词
Anisotropic mesh adaptation; Time-accurate; Multi-scale; Metric; Fixed-point algorithm; Unsteady flows; RAYLEIGH-TAYLOR INSTABILITY; UNSTRUCTURED GRIDS; INCOMPRESSIBLE FLOWS; HIGH-ORDER; SIMULATION; COMPUTATIONS; GENERATION; INTERPOLATION; OPTIMIZATION; ADAPTIVITY;
D O I
10.1016/j.jcp.2018.06.043
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
This paper deals with anisotropic mesh adaptation applied to unsteady inviscid CFD simulations. Anisotropic metric-based mesh adaptation is an efficient strategy to reduce the extensive CPU time currently required by time-dependent simulations in an industrial context. In this work, we detail the time-accurate extension of multi-scale anisotropic mesh adaptation for steady flows [35] (a control of the interpolation error in L(P )norm to capture all the scales of the solution contrary to the L-infinity norm that only focuses on the larger scales) to unsteady flows when time advancing discretizations are considered. This is based on a space-time error analysis and an enhanced version of the fixed-point algorithm [3]. We also show that each stage - remeshing, metric field computation, solution transfer, and flow solution - is important to design an efficient time-accurate anisotropic mesh adaptation process. The parallelization of the whole mesh adaptation platform is also discussed. The efficiency of the approach is emphasized on three-dimensional problems with convergence rate and CPU time analysis. (C) 2018 Elsevier Inc. All rights reserved.
引用
收藏
页码:28 / 63
页数:36
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