基于伴随的网格自适应及误差修正技术
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- 英文论文题名：Adjoint-Based Grid Adaptation and Error Correction
- 论文作者：崔鹏程 ; 邓有奇 ; 张健 ; 陈江涛 ; 李欢
- 英文论文作者：Cui Pengcheng ; Deng Youqi ; Zhang Jian ; Chen Jiangtao ; Li Huan ; China Aerodynamics Research and Development Center
- 年：2016
- 作者机构：中国空气动力研究与发展中心;
- 论文关键词：非结构网格 ; 伴随方程 ; 网格自适应 ; 误差修正
- 英文论文关键词：Unstructured Grid ; Adjoint Equation ; Grid Adaptation ; Error Correction
- 会议召开时间：2016-09-04
- 会议录名称：2016海峡两岸流体力学研讨会论文摘要集
- 语种：中文
- 分类号：O35
- 学会代码：AGLU
- 会议名称：2016海峡两岸流体力学研讨会
- 会议地点：中国青海西宁
- 主办单位：中国力学学会
- 学会名称：中国力学学会
- 页数：2
- 文件大小：4690k
- 原文格式：D
- 会议级别：全国
摘要
网格自适应是一种提高计算流体力学(CFD)计算精度的重要方法。基于流场方程的离散伴随优化理论和三维非结构网格,建立了一种适用于格心格式有限体积法的网格自适应技术和目标函数误差修正方法。详细研究了用流动伴随变量进行目标函数误差估计和修正,构造了网格单元剖分判据,初步实现了网格物面投影和空间单元优化。最后分别对二维和三维外形绕流进行了自适应数值模拟,并对升、阻力等目标函数进行了误差修正。数值结果表明,本文自适应方法能正确地捕捉到影响目标函数计算精度的敏感区域,误差修正技术显著提高了升、阻力等目标函数的计算精度。最后,探讨了基于伴随方法的自适应与传统的基于流场特征的自适应方法之间的差异,两种方法各有优势。
Grid adaptation is an important way to improve the accuracy of computational fluid dynamics(CFD). According to the discrete adjoint optimizing theory and three-dimensional unstructured grid, a modified grid adaptation and error correction method which suits for cellcentred scheme finite volume method is presented. A method to predict and reduce the error of objective functions using adjoint equation is given, and some techniques to divide isotropic grids, smooth spatial grids and project surface grids are discussed. The grid adaptation and error correction method is applied to the simulation of inviscid flows around two-dimensional and threedimensional configurations. Numerical results show that the sensitive grids to objective functions are detected and refined after grid adaptation, and the accuracy of objective functions is obviously improved after error correction. Finally, the difference between adjoint-based grid adaptation and traditional feature-based grid adaptation is discussed.
Grid adaptation is an important way to improve the accuracy of computational fluid dynamics(CFD). According to the discrete adjoint optimizing theory and three-dimensional unstructured grid, a modified grid adaptation and error correction method which suits for cellcentred scheme finite volume method is presented. A method to predict and reduce the error of objective functions using adjoint equation is given, and some techniques to divide isotropic grids, smooth spatial grids and project surface grids are discussed. The grid adaptation and error correction method is applied to the simulation of inviscid flows around two-dimensional and threedimensional configurations. Numerical results show that the sensitive grids to objective functions are detected and refined after grid adaptation, and the accuracy of objective functions is obviously improved after error correction. Finally, the difference between adjoint-based grid adaptation and traditional feature-based grid adaptation is discussed.
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