分层嵌套重叠网格动态组装方法及应用
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- 英文论文题名：A Dynamic Assembling Methodand Applications of Hierarchical Overset Grids
- 论文作者：李晓东 ; 屈崑 ; 蔡晋生
- 英文论文作者：Li Xiaodong ; Qu kun ; Cai Jinsheng ; School of Aeronautics ; Northwestern Polytechnical University
- 年：2016
- 作者机构：西北工业大学航空学院;
- 论文关键词：嵌套重叠网格 ; 树结构 ; 自适应直角网格 ; 动网格 ; 非定常流动
- 英文论文关键词：overset grid ; tree structures ; adaptive Cartesian grid ; moving grid ; unsteady flows
- 会议召开时间：2016-11-25
- 会议录名称：2016年航空科学与技术全国博士生学术论坛摘要集
- 语种：中文
- 分类号：V211
- 学会代码：XBHH
- 会议名称：2016年航空科学与技术全国博士生学术论坛
- 会议地点：中国陕西西安
- 主办单位：西北工业大学研究生院、中国高校航空学院院长联席会
- 学会名称：西北工业大学航空学院
- 页数：1
- 文件大小：565k
- 原文格式：D
- 会议级别：全国
摘要
嵌套重叠网格技术在复杂流动数值模拟中已广泛应用,特别是涉及多体运动的模拟问题。针对嵌套重叠网格的组装效率问题,本文将自适应树结构的辅助直角网格应用到重叠网格的切割和贡献单元搜索中,大大加快了重叠网格的组装速度。采用基于物面距离的分层嵌套重叠网格策略和重叠区域最小化方法,提高了重叠网格组装的效率和质量。采用多个二/八叉树处理动态重叠问题,减少组装过程中的冗余计算和时间消耗。不同流动算例的计算结果均与文献的数据一致,表明本文发展的嵌套重叠网格组装方法具有很高的计算效率,可用于计算运动边界的复杂流动问题。
The overset or chimera grid has been widely used in numerical simulation of aerodynamic problems with complex geometry, especially those problems with bodies in relative motion. The method of auxiliary Cartesian grids based on adaptive the tree structure is applied to perform fast hole cut-ting and donor searching, which effectively enhances the efficiency of overset grid assembly. By utilizing a hierarchical strategy for overset grids and a minimal overlapping-domain approach, which are both based on the rule of wall distance, the efficiency and quality of overset grid assembly are improved. For dynamic problems of moving bodies, multiple binary trees and octrees are used to reduce the redundant work and the time consumption in procedures of overset grid assembly. The computational results of several cases agree well with the published data, which demonstrates that the technique in this paper is computationally efficient and can be successfully employed to complex flow problems of multiple moving bodies.
The overset or chimera grid has been widely used in numerical simulation of aerodynamic problems with complex geometry, especially those problems with bodies in relative motion. The method of auxiliary Cartesian grids based on adaptive the tree structure is applied to perform fast hole cut-ting and donor searching, which effectively enhances the efficiency of overset grid assembly. By utilizing a hierarchical strategy for overset grids and a minimal overlapping-domain approach, which are both based on the rule of wall distance, the efficiency and quality of overset grid assembly are improved. For dynamic problems of moving bodies, multiple binary trees and octrees are used to reduce the redundant work and the time consumption in procedures of overset grid assembly. The computational results of several cases agree well with the published data, which demonstrates that the technique in this paper is computationally efficient and can be successfully employed to complex flow problems of multiple moving bodies.
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