搅拌桨叶附近压力异常
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1.首先感觉你的网格正交性不是太好,请查验
2.请告知你的网格物理尺寸
3.是否做了网格无关性呢
4.感觉大概率是网格数不足,及网格质量不好的原因
5.请参考这篇文章 https://journals.sagepub.com/doi/pdf/10.1260/1757-482X.3.1.13
6.条件许可的话网格建议上千万,湍流方法建议用LES
7.所有壁面处建议都加密并注意查看y+ -
@知行 感谢耐心解答!首先网格的质量如下:
Mesh stats points: 182724 faces: 532288 internal faces: 516536 cells: 174804 faces per cell: 6 boundary patches: 3 point zones: 0 face zones: 1 cell zones: 3 Overall number of cells of each type: hexahedra: 174804 prisms: 0 wedges: 0 pyramids: 0 tet wedges: 0 tetrahedra: 0 polyhedra: 0 Checking topology... Boundary definition OK. Cell to face addressing OK. Point usage OK. Upper triangular ordering OK. Face vertices OK. Number of regions: 1 (OK). Checking patch topology for multiply connected surfaces... Patch Faces Points Surface topology walls 10840 10915 ok (non-closed singly connected) impeller1 1324 1326 ok (closed singly connected) outlet 3588 3663 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (-0.109995 -1.11019e-16 -0.109997) (0.109995 0.22 0.109997) Mesh has 3 geometric (non-empty/wedge) directions (1 1 1) Mesh has 3 solution (non-empty) directions (1 1 1) Boundary openness (5.83486e-16 -2.30396e-16 4.46812e-17) OK. Max cell openness = 3.29007e-16 OK. Max aspect ratio = 5.02531 OK. Minimum face area = 1e-06. Maximum face area = 2.73916e-05. Face area magnitudes OK. Min volume = 4.64288e-09. Max volume = 1.25165e-07. Total volume = 0.0083523. Cell volumes OK. Mesh non-orthogonality Max: 39.7405 average: 7.14766 Non-orthogonality check OK. Face pyramids OK. Max skewness = 0.506949 OK. Coupled point location match (average 0) OK. Mesh OK. End
最大非正交性为39,平均为7,正交性还不错。
其次,几何是一个直径和高都是22cm的釜,桨叶直径8cm。
关于网格数量的话,由于目前还在案例调试阶段,所以先用17w的网格算起来比较快,五六十万的网格我也算过,也会出现这种现象。LES的计算代价有点大,所以还是想考虑RANS。
最后,在所有壁面处我使用了湍流模型kEpsilon的壁面函数,所以是不是对壁面处的网格厚度依赖性不是很大?我尝试把壁面加密一下试试。谢谢! -
您好,这个旋转的文件是在哪里设置的呢,目前正在做旋转喷射的案例,但是一直不知道怎么设置
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@15735420621 可以参考自带案例mixerVessel2D,旋转域使用topoSet进行设置,旋转参数在MRFProperties中进行设置