非结构重叠网格显式装配算法

宣传伟; 韩景龙

doi:10.13700/j.bh.1001-5965.2019.0020

非结构重叠网格显式装配算法

doi: 10.13700/j.bh.1001-5965.2019.0020

宣传伟,
韩景龙^,

南京航空航天大学航空学院机械结构力学及控制国家重点实验室, 南京 210016

基金项目:

国家自然科学基金 11472133

江苏高校优势学科建设工程基金

详细信息

作者简介:
宣传伟男, 博士研究生。主要研究方向:气动弹性力学

韩景龙男, 博士, 教授, 博士生导师。主要研究方向:气动弹性力学

通讯作者:
韩景龙, E-mail: hjlae@nuaa.edu.cn

中图分类号: V211.3
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- 被引次数: 0
出版历程
- 收稿日期: 2019-01-17
- 录用日期: 2019-04-05
- 网络出版日期: 2019-10-20

Explicit assembly algorithm of unstructured overset grid

XUAN Chuanwei,
HAN Jinglong^,

State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Funds:

National Natural Science Foundation of China 11472133

the Priority Academic Program Development of Jiangsu Higher Education Institutions

More Information

Corresponding author: HAN Jinglong, E-mail: hjlae@nuaa.edu.cn

摘要

摘要:
针对重叠网格中洞映射法占用过多物理内存的问题，发展了一种改进型洞映射法；基于相邻单元搜索法，发展了一种基于相邻阵面的贡献单元搜索法；通过将割补法与隐式切割技术相结合提出了一种非结构重叠网格显式装配算法。该算法首先生成一套包围物面的笛卡儿网格，其次存储所有与物面边界相交的笛卡儿网格信息，最后根据所存储笛卡儿网格与所需判断的网格单元的相对位置来判断其是否为洞内单元。在成功判断出所有洞内单元后，以当前洞边界为初始阵面推进，同时以各个网格单元的物面距离为判别标准对重叠区域进行优化，生成最终插值边界。所提算法优化了传统非结构重叠网格装配过程，具有物理内存占用低，贡献单元搜索次数少以及计算效率高等特点。通过2个典型复杂流动算例验证了所提算法的准确性与适用性。
- 重叠网格 /
- 割补法 /
- 洞映射 /
- 非结构网格 /
- 物面距离
Abstract:
To solve the problem that the hole mapping method occupies too much physical memory, an improved hole mapping method was developed. Based on the neighbor-to-neighbor search algorithm, a donor search method based on adjacent front was developed. An explicit assembly algorithm of unstructured overset grid was presented by combining the cut-paste method with the implicit cutting technique. First, the algorithm generated a set of Cartesian grids surrounding the wall surface. Second, those Cartesian cells intersecting the wall surface were stored. Finally, relative positions of the stored Cartesian cells were used to determine whether a grid point was inside the wall. After successfully determining all the grid points inside the wall, the current fringe grid points were used as the initial front, and the overlapping area was optimized by the wall distance of each grid point to generate the final interpolation boundary. The proposed explicit algorithm optimizes the traditional implicit assembly process of unstructured overset grid. It features in low physical memory occupation, low cost of donor searching and high computational efficiency. The accuracy and applicability of the proposed explicit method were verified by two typical complex flow examples.
- overset grid /
- cut-paste method /
- hole mapping /
- unstructured grid /
- wall distance

HTML全文

图 1 改进型洞映射法产生的笛卡儿网格示意图

Figure 1. Cartesian grids of improved hole mapping method

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图 2 基于阵面推进的相邻单元搜索法

Figure 2. Neighbor-to-neighbor search algorithm based on advancing front

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图 3 非结构重叠网格显式装配技术

Figure 3. Explicit assembly technique of unstructured overset grid

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图 4 30P30N机翼重叠网格图

Figure 4. Overset mesh of 30P30N wing

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图 5 30P30N翼面马赫数云图

Figure 5. Mach number contour of 30P30N wing surface

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图 6 30P30N翼面压力系数的数值与试验结果对比

Figure 6. Comparison of pressure coefficient of 30P30N wing surface between numerical and experimental results

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图 7 Titan Ⅳ非结构重叠网格系统

Figure 7. Unstructured overset mesh system for Titan Ⅳ

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图 8 Titan Ⅳ对称面重叠网格

Figure 8. Overset mesh of Titan Ⅳ's symmetry plane

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图 9 Titan Ⅳ对称面压力云图

Figure 9. Pressure contour of Titan Ⅳ symmetry plane

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图 10 芯级中心线压力分布

Figure 10. Pressure distribution along rocket center line

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表 1 不同算法的效率比较

Table 1. Comparison of efficiency between different algorithms

算法	贡献单元搜索次数	时间/s
本文算法	4 134	1.25
传统隐式算法	38 815	5.12

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表 2 不同算法的性能比较

Table 2. Comparison of performance among different algorithms

性能指标	算法	30P30N	Titan Ⅳ
内存占用/MB	本文算法	77.66	1 023.77
内存占用/MB	传统洞映射	151.23	1 903.58
贡献单元搜索时间/s	本文算法	2.12	29.50
贡献单元搜索时间/s	传统隐式算法	10.35	126.43

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