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Orthonogality angle appearing as nan

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Old   October 3, 2021, 14:14
Default Orthonogality angle appearing as nan
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Arijit Saha
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Hi SU2 user,
I am trying to simulate a compressible case, meshing with gmsh and then doing the numerical analysis with SU2. The simulation is running fine but I observed a weird thing in the orthogonality angle tab of su2 and that is the min and max ortho angle is nan. I am wondering what might be the reason of that? Will that lead to any invalid results? I have attached the snapshot. Any kind of information will be of real help.
Thank you.
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Old   October 3, 2021, 17:08
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Hi ari003,


You can check the Mesh quality statistics in the volume output by adding:


VOLUME_OUTPUT= MESH_QUALITY


to your .cfg file. I guess you will see a few nan-cells but most of it will be fine. So I suspect more a problem in the Orthogonality computation in that case.


I searched quite a few NaN's through the code with some debugging and I always had to get rid of the mesh-quality routines as NaN's are often encountered in those code-bits due to some trigonometry going on in there.


So to some degree I know that code could need a few more error-checks or safety nets but didn't find the time to do so. In case you are interested to take a look into this you are more than welcome The implementation is in CPhysicalGeometry.cpp CPhysicalGeometry::ComputeMeshQualityStatistics.


Hope that helps, Tobi
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