重叠网格中隐式装配策略的改进

宣传伟; 韩景龙

doi:10.13700/j.bh.1001-5965.2019.0260

重叠网格中隐式装配策略的改进

doi: 10.13700/j.bh.1001-5965.2019.0260

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

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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- 文章访问数: 697
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- 被引次数: 0
出版历程
- 收稿日期: 2019-05-28
- 录用日期: 2019-07-19
- 网络出版日期: 2020-02-20

Enhancement of implicit assembly strategy in overlapping grids

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

Priority Academic Program Development of Jiangsu Higher Eduction Institutions

More Information

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

摘要

摘要:
作为重叠网格技术的重要组成部分，隐式装配没有显式的“挖洞”过程，仅需在搜索贡献单元的同时通过对比不同单元的品质来分类单元。通过对传统隐式装配过程进行改进，提出了一种更高效的隐式装配策略，减少了贡献单元的搜索次数；同时，提出了一种基于笛卡儿网格映射的局部贡献单元搜索法，提高了网格装配效率。首先，针对每一个子网格，在计算其到自身物面的最短物面距离的同时也计算到其他所有物面的最短物面距离；然后，通过比较同一单元到不同物面的最短物面距离来控制洞边界的位置；最后，仅对插值单元进行局部的贡献单元搜索，避免了针对所有单元进行全局贡献单元搜索的过程。通过3个典型复杂流动算例验证了所提方法的准确性与高效性。
- 重叠网格 /
- 贡献单元搜索 /
- 笛卡儿网格 /
- 隐式网格装配 /
- 物面距离
Abstract:
As an important part of the overlapping grid technology, the implicit grid assembly has no explicit "hole-cutting" process, and it is only necessary to classify cells by comparing their qualities while searching for donor cells. By improving the traditional implicit assembly process, a more efficient implicit assembly strategy is developed to alleviate the effort of searching for donorcells. At the same time, a local donorcell search method based on Cartesian grid mapping is developed to improve grid assembly efficiency. First, for each sub-grid, the shortest distances to all other wall surfaces are calculated while calculating the shortest distance to its own wall surface.Then, the position of hole boundary is controlled by comparing the shortest distances of the same cell to different wall surfaces. Finally, only partial donorcell search is performed on interpolation cells, which avoids the process of global donor cell search for all cells. The accuracy and efficiency of the developed strategy are verified by three typical complex flow examples.
- overlapping grid /
- donor cell search /
- Cartesian grid /
- implicit grid assembly /
- wall distance

HTML全文

图 1 隐式挖洞

Figure 1. Implicit holecutting

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图 2 洞边界

Figure 2. Hole boundary

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图 3 判断单元是否位于物面内部

Figure 3. Determine whether a cell is inside wall surface

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图 4 重叠网格系统

Figure 4. Overlapping grid system

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图 5 重叠网格系统的物面距离云图

Figure 5. Wall surface distance contour of overlapping grid system

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图 6 挖洞后网格

Figure 6. Grids after hole cutting

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图 7 基于笛卡儿网格映射的局部贡献单元搜索

Figure 7. Local donor cell search based on Cartesian grid mapping

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图 8 30P30N三段式机翼重叠网格效果图

Figure 8. Overlapping grid of 30P30N wing

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图 9 30P30N翼面压力云图

Figure 9. Pressure contour of 30P30N wing

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图 10 30P30N翼面压力系数对比

Figure 10. Comparison of pressure coefficients of 30P30N wing

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图 11 Titan Ⅳ运载火箭重叠网格系统

Figure 11. Overlapping grid system for Titan Ⅳ launch vehicle

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图 12 TitanⅣ运载火箭挖洞效果

Figure 12. Hole cutting effect of Titan Ⅳ launch vehicle

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图 13 Titan Ⅳ运载火箭对称面流场速度云图

Figure 13. Velocity contour of symmetry plane flow of Titan Ⅳ launch vehicle

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图 14 芯级中心线压力分布

Figure 14. Pressure distribution along rocket center line

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图 15 机翼挂载重叠网格系统

Figure 15. Overlapping grid system of wing store

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图 16 机翼挂载分离挖洞效果

Figure 16. Hole cutting effect of wing store separation

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图 17 挂载物下落过程

Figure 17. Falling of store

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图 18 机翼挂载分离过程计算结果与实验结果对比

Figure 18. Comparison of calculation and experiment resultsof wing store separation process

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表 1 不同策略的网格装配时间比较

Table 1. Grid assembly time comparison of different strategies

策略	网格装配时间/s
策略	30P30N三段式机翼	Titan Ⅳ运载火箭	机翼挂载分离
本文策略	2.88	28.54	9 072.34
文献[35]策略	4.03	40.56	13 670.35
文献[26]策略	4.55	51.32	16 405.69
传统策略	5.38	72.66	27 702.00

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