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May 20, 2019, 09:05 |
mesh warning
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#1 |
Member
Join Date: Nov 2017
Posts: 54
Rep Power: 8 |
hello dear
I want to solve a problem with ansys fluent in the axisymmetric mode, but i when i check the mesh a warning as following is showed in console: { Domain Extents: x-coordinate: min (m) = 0.000000e+00, max (m) = 3.000000e-01 y-coordinate: min (m) = -7.485200e-05, max (m) = 2.000000e-03 Volume statistics: minimum volume (m3): 1.736124e-08 maximum volume (m3): 5.793137e-08 total volume (m3): 3.767267e-06 minimum 2d volume (m3): 5.775142e-06 maximum 2d volume (m3): 6.224858e-06 Face area statistics: minimum face area (m2): 9.625237e-04 maximum face area (m2): 6.000007e-03 Checking mesh.............. WARNING: Invalid axisymmetric mesh with nodes lying below the x-axis............. Done. WARNING: Mesh check failed. To get more detailed information about the mesh check failure increase the mesh check verbosity via the TUI command /mesh/check-verbosity. Fluent can also try to fix the mesh check problems via the TUI command /mesh/repair-improve/repair. } does anyone know about this? |
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May 20, 2019, 12:19 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,672
Rep Power: 65 |
It's a meshing problem. You need to go back to your mesh generator and figure out what you did wrong.
In Fluent, the axis for axisymmetric problems is always the y=0 axis and you generate a mesh on the upper XY plane (the y > 0 half-plane). Your mesh generation software doesn't know this. It just makes a mesh based on your inputs and even if you import CAD that you think is a box on the upper half plane, you can end up with a mesh with some nodes that end up in the negative y areas for various reasons. It's a combination of importing the right geometry/CAD and specifying the right mesh settings. A workaround might be to translate your mesh upwards by a tiny amount such that all the cells are now strictly y>0. Do this at your own risk. The difference of a few micrometers is usually not that significant. |
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