三维各向异性叉树网格流场自适应算法研究

建立了三维叉树形网格的数据结构,并将结构网格的有限体积法引入到叉树网格中,建立了相应的NS方程求解方法。在此基础上完善了包括各向异性自适应判别、合并/分裂、网格优化等步骤的算法,并提出了对流场结构进行“保护”性加密的优化加密方式。基于自适应叉树网格对高超声速横向喷流流场进行了数值模拟,捕捉到细致的流场结构,并将壁面压力系数计算值与文献试验值比较,得到了很好的模拟效果,具有较高的流场分辨精度。

Investigation of 3D anisotropic self-adaptive tree mesh

In this paper,a data structure of three dimensional tree mesh was built.And the finite volume method for structure mesh was introduced to tree mesh. Based on this structure,algorithms were built for anisotropic self-adaptive identifeation,cell mergence or split,mesh refinement,and other steps.And an algorithm for protective mesh refinement was developed.Finally,a lateral jet in 3D hypersonic flow was simulated numerically with anisotropic self-adaptive tree mesh.The result shows the structures of flow field clearly, and pressure coefficient distribution on wall makes a good agreemenal with experimental resultal.It is proved that the anisotropic self-adaptive tree mesh is suitable and effective with convenient mesh refinement and high resolution for flow field.