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[snappyHexMesh] Avoiding wedge cells and folded cells while adding layers - snappyHexMesh

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Old   March 21, 2018, 07:57
Default Avoiding wedge cells and folded cells while adding layers - snappyHexMesh
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Saideep
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Hi all;

I have an .stl image rendered from openscad and need to use it for a 2D interfoam case setup.

I have a number of wedge shaped cells on the wall that are severely causing a problem with respect to the continuity of surface tension forces acting on the cell faces. I decided to add layers on the wall that pushed the wedge cells on the wall upward (Fig 1) however this doesn't solve the problem but causes additional issues.

Problem 1: The wedge cells are doing more bad than good and I would like to avoid them though the cells surrounding could be coarse. Is there a way to let snappyHexMesh know regarding this? (Fig 2)

Problem 2: Adding layers on the wall, is resulting in a "folded" mesh. That is the cumulative cell count is not being manipulated and hence the cells at the transition from slanting to vertical walls gets compressed. Is there a way to avoid this? I tried varying the minVolRatio and could go upto 0.25 yet I run into this issue. (Fig 3)

Thanks;
Saideep
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File Type: jpg Fig 2.jpg (141.6 KB, 22 views)
File Type: jpg Fig 3.jpg (180.5 KB, 21 views)
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Old   March 21, 2018, 18:35
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This geometry is really simple. Why don't you use blockMesh instead?
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Old   March 22, 2018, 08:10
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Yes for this, I could use blockMesh. But I would like to take it forward trying different shapes at the intersection which couldnt be done using blockmesh. So, started using sHM for this simple case to be extended for other cases.
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