面向复杂界面的通用型CFD/DSMC耦合方法

张壮; 王学德

doi:10.13224/j.cnki.jasp.20230380

面向复杂界面的通用型CFD/DSMC耦合方法

doi: 10.13224/j.cnki.jasp.20230380

张壮,
王学德^*, ,

南京理工大学能源与动力工程学院，南京 210094

详细信息

作者简介:
张壮（1998-），男，硕士生，主要从事稀薄气体动力学研究

通讯作者:
王学德（1977-），男，副教授，博士，主要从事稀薄气体动力学研究。E-mail：wangxuede2000@njust.edu.cn

中图分类号: V448.2
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出版历程
- 收稿日期: 2023-06-08
- 网络出版日期: 2024-10-22

A general coupled CFD/DSMC method for complex interfaces

ZHANG Zhuang,
WANG Xuede^{*
, ,}

School of Energy and Power Engineering，Nanjing University of Science and Technology，Nanjing 210094，China

摘要

摘要:
对于高超声速飞行器在临近空间形成的连续与稀薄混合流场，DSMC（direct simulation of Monte Carlo）方法需要消耗巨大的计算资源，CFD（computational fluid dynamics）方法，无法对稀薄效应进行准确模拟。在对连续/稀薄耦合数值方法深入研究的基础上，提出了一套非结构网格的CFD/DSMC耦合方法。该方法具有通用强、适应性良好的特点，进行耦合计算时对不规则复杂分界面无需进行光滑处理。对超声速圆柱绕流和钝锥体流场进行了模拟，数值结果表明：该方法对不规则分界面和复杂外形具有高度适用性，通过与重叠网格结果进行比较验证了该方法的有效性和计算效率，相较于传统的DSMC方法，计算效率分别提高了2.3倍和3.16倍，具有高效性。
- CFD/DSMC耦合方法 /
- 非结构网格 /
- 复杂界面 /
- 通用性 /
- 效率
Abstract:
For the continuum/rarefied hybrid flow field formed by hypersonic aircraft in near-space, the DSMC (direct simulation Monte Carlo) method requires significant computational resources, while the CFD (computational fluid dynamics) method cannot accurately simulate rarefaction effects. Based on in-depth research on the coupling algorithm for continuous/rarefied flows, an unstructured grid coupled CFD/DSMC method was proposed. This method had the characteristics of strong universality and good adaptability, and there was no need to smooth the irregular complex interface when coupling calculation was carried out. Simulations of hypersonic flow around a circular cylinder and blunt cone were performed, and the numerical results demonstrated that the method is highly applicable to irregular interfaces and complex geometries. The effectiveness and computational efficiency of the method were validated by comparing the results with those obtained using overlapping grids. Compared with traditional DSMC methods, the computational efficiency of the two test cases was improved by factors of 2.3 and 3.16, respectively.
- CFD/DSMC coupling method /
- unstructured grid /
- complex interface /
- versatility /
- efficiency

HTML

图 1 分子追踪示意图

Figure 1. Schematic diagram of molecular tracing

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图 2 混合流场网格分区结构示意图

Figure 2. Schematic diagram of mixed flow field grid partition structure

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图 3 信息网格生成示意图

Figure 3. Schematic diagram of information grid generation

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图 4 整体计算网格结构示意图

Figure 4. Schematic diagram of overall computational grid structure

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图 5 信息传递示意图

Figure 5. Schematic diagram of signal transmission

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图 6 CFD/DSMC耦合算法流程图

Figure 6. Flowchart of CFD/DSMC coupling algorithm

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图 7 圆柱绕流流场区域分布图

Figure 7. Distribution map of flow field in cylinder wake

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图 8 圆柱绕流两种方法计算结果比较

Figure 8. Comparison of calculation results of two methods in cylinder wake

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图 9 壁面特征系数比较

Figure 9. Comparison of wall characteristic coefficients

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图 10 钝锥流场区域分布图

Figure 10. Distribution map of flow field in blunt cone

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图 11 钝锥两种方法计算结果比较

Figure 11. Comparison of calculation results of two methods in blunt cone

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图 12 钝锥流场驻点线宏观特性分布曲线

Figure 12. Distribution curve of macroscopic characteristics of stationary lines in blunt cone flow field

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表 1 两种方法计算耗时

Table 1. Time consumption of two methods h

方法圆柱耗时钝锥耗时

CFD/DSMC 1.82 1.93
DSMC 4.23 6.10

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