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[snappyHexMesh] Strange thin layer at interface between two regions |
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January 31, 2023, 09:19 |
Strange thin layer at interface between two regions
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#1 |
New Member
Join Date: Sep 2022
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Hi,
I want to perform a conjugate heat-flow simulation and thus needs to mesh multi regions, including fluid and solids. A simplified case is attached which includes a chamber and a plate, as well as all needed files to run. Strange cells are generated by snappyHexMesh at the interface between the chamber and the plate. These strange cells belong to the chamber and is a thin layer. In addition they seems not connected to the lower cells of chamber. Meanwhile besides the /chamber/patch/chamber_to_plate, there is an extra patch with the name of "plate" under /chamber/patch/ in paraView. ParaView shows this patch is composed of double layers of surface but in original stl surface "plate" it is a single layer surface. In the attached figures, all cliping is done at (0,0,0) with normal of (0,1,0). The version of openFoam I used is v2206. Any idea is appreciated! Thank you in advance! |
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January 31, 2023, 09:23 |
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#2 |
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The rest figures to be uploaded.
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February 1, 2023, 04:46 |
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#3 |
New Member
Join Date: Sep 2022
Posts: 19
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Further investigation shows after the 1st step of snappyHexMesh, the original stl surface of plate becomes a flat patch, i.e. two layers of cells overlap with each other. This patch "plate" locates at the lower surface of original stl surface of plate. The two overlapped layers behaves as a boundary in cells of chamber, i.e. the cells of chamber adjacent the two layers in patch of plate do not connect to each other, and leads to the split in 2nd step of snappyHexMesh.
Can anybody give advice? I guess the problem relates to the fact the region "plate" is completely in the region "chamber" which causes some issue when assigning cells to region. |
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February 10, 2023, 00:30 |
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#4 |
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Posts: 19
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Trials found after changing the number of cell along x, y, and z in background mesh the problem vanishes, e.g.
original: (with issue at interface) Code:
xCells 172; yCells 172; zCells 115; new: (without the mentioned problem) Code:
xCells 180; yCells 180; zCells 120; Does anybody know the reason? Or is it a bug in snappyHexMesh? |
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