网格类型对典型化工园区下垫面气体扩散模拟的影响

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中图分类号：X511 文献标志码：A 文章编号：1000-4939（2025）03-0677-10

Abstract：Inorder to investigate the applicability of mesh，which is the key basis for CFD（computational fluid dynamics）simulation，for gas dispersion prediction under chemical industrial parks（CIPs），fullscale numerical simulation was developed based on a tracer gas（ SF6 ）field leakage experiment.Four types of mesh of tetrahedral，polyhedral，hybrid tetrahedral/hexahedral（hexcore），hybrid polyhedral/hexahedral（poly-hexcore）was selected，and then compared from grid generation characteristics（cell count， minimum orthogonal quality，maximum aspect ratio），simulation performance （calculation precision，accuracy and time）.The results showed that from the mesh generation characteristics，the number of polyhedral grids （ 0.6～1.5 million）was minimized，followed by poly-hexcore mesh （ 0.8～3.3 million）；poly-hexcore mesh（O.44）and polyhedral grid had the beter mesh orthogonal quality（O.41） than tetrahedron （0.04）and hexcore （O.O2），and the aspect ratio of the poly-hexcore mesh was the lowest.From the simulation perspective，the poly-hexcore type of mesh was the highest with all equations reaching 10-4 . In terms of accuracy，poly-hexcore mesh had minimum simulation eror and maximum correlation（0.98） with observed concentration.Meanwhile，the simulation eficiency of poly-hexcore mesh （ 27min ）was significantly higher than that of polyhedral mesh （ 47min ）and hexcore mesh（ 112min ）.In addition，in terms of flow characteristics，the plume width of polyhedral mesh was larger than that of hybrid girds，and the average plume concentration of hexcore mesh was the highest.

Key words：mesh type; chemical industrial parks；gas difusion； numerical simulation； small scale

网格是计算流体力学（computational fluid dy-namics，CFD）替代求解域的最小单元，是计算流体力学模型分析的基础[1。（剩余14164字）