一种基于流场物理信息的CFD网格密度优化方法  

CFD Mesh Density Optimization Method Based on Characteristic Flow Distributions

作　　者：刘江 曾志勇[1] LIU Jiang;ZENG Zhiyong(School of Computer Science and Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400722,China)

机构地区：[1]重庆邮电大学计算机科学与技术学院,重庆400065 [2]中国科学院重庆绿色智能技术研究院,重庆400722

出　　处：《计算机科学》2023年第S02期803-810,共8页Computer Science

基　　金：国家重点研发计划(2018YFC0116704);中国科学院科技服务网络计划区域重点项目(KFJ-STS-QYZD-2021-01-001);国家自然科学基金(61672488);雷达资料同化关键技术及数值预报客观订正技术研究(E190600801)。

摘　　要：CFD计算网格的生成及优化技术是计算流体力学数值计算的关键技术之一,很大程度上决定了数值计算的最终精度及计算效率。CFD模拟实际工程问题所采用的网格规模可达千万级别,在给定的计算时间内获得更高的数值计算精度,是当前CFD急需发展的关键技术。已有研究表明,不同类型的流场误差产生的主要区域与其特征物理量的梯度正相关。有鉴于此,提出了一种基于流场物理信息的网格密度优化方法,使用该方法以及OpenFOAM与cfMesh工具对不可压缩流体案例、燃烧流案例和多相流案例分别进行数值计算。实验结果表明,对于具有不同特征的案例,基于所提方法优化的网格均能够在计算时长差别不大的情况下,比较明显地提升计算精度。The generation and optimization of CFD mesh is a key technology in numerical computation of CFD,which significantly determines the final accuracy and efficiency of numerical simulation.The scale of the mesh used in CFD simulation of practical engineering problems can be tens of millions.How to obtain higher numerical accuracy within a given calculation time is a key technology urgently needed to develop CFD.It is shown that the errors of numerical simulation are positively correlated with the gradients of their characteristic physical quantities.In this paper,a mesh density optimization method based on the gradients of chara-cteristic flow distributions is proposed.The mesh density optimization method,the OpenFOAM and cfMesh tools are used to simu late an incompressible fluid,a combustion flow,and a multiphase flow.Simulation results show that for various cases with different characteristics,the optimized mesh by the proposed method can significantly improve the calculation accuracy within almost same calculation time.

关 键 词：CFD 网格优化 特征物理量 OPENFOAM 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]