Numerical schemes of intensive blast wave propagation in large scale complex enviroments
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摘要: 为实现大尺度、复杂空间范围内的强爆炸冲击波高效数值模拟,基于扩散界面理论的多组分模型建立了可用于模拟极端条件下、任意种介质相互作用的可压缩多相流数值方法,并基于人工智能技术提出了一种具有MUSCL-THINC-BVD特征的鲁棒、低耗散、高效率重构方法,在激波、接触间断和物质界面等关键区域能够自适应的选择最合适的重构方法,并达到最小的全局数值耗散,同时比BVD框架下的传统格式具有更高的计算效率。建立了基于全球地理信息系统(GIS)的自动化几何建模和网格剖分技术、网格自适应和大规模并行计算方法,实现了复杂地形环境和真实城市建筑条件的冲击波传播过程的完整数值模拟,得到了不同条件下的冲击波载荷分布,验证了数值方法的正确性和应用前景。
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关键词:
Abstract: A compressible multiphase flow numerical scheme, induced from the multi- component diffuse interface model with arbitrary number of materials, is established to simulate the interaction between distinct materials under extreme conditions. A robust, low dissipation and high efficiency reconstruction method, the MUSCL-THINC-BVD, is proposed with the aid of artificial intelligence technology, which can adaptively select the most suitable reconstruction method in the essential regions such as shock wave, contact discontinuity and material interface, and can achieve the minimum global numerical dissipation. Furthermore, it has a higher computational efficiency than the traditional BVD scheme. The automatic geometric modeling and grid meshing based on global geographic information system (GIS), adaptive mesh refinement and large-scale parallel computing method are established to realize the whole numerical simulation of shock wave propagation in complex terrain and real urban environments. Several numerical applications, such as the propagation of intensive blast wave in complicated terrain and local urban environments, are finished, to validate our numerical schemes.-
Key words:
- multiphase flow /
- reconstruction scheme /
- blast wave /
- GIS /
- real terrain /
- local urban
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