[Gmsh] Problem with Gmsh

rafa13 · August 4, 2015, 08:03

Hi Kate,

I think that gmsh2ToFoam are not for above OF1.4.1. When i get this default faces problem mostly it is because of the definition of the physical surfaces that are not defined. I you get default faces in the interior of the mesh try to remove the mesh with topoSet, or simply go to constant/polymesh/boundry and look if there are 0 faces if so delete the hole boundry and change the number of the top left of the file, this number indicates how many boundry do you have. try it maybe it works

Kind regards
Rafa Marques

KateEisenhower · August 4, 2015, 11:42

Hi Rafael,

thanks for your opinion! Unfortunately there are more than 0 faces in it. However, I'll have a look at topoSet!

Best regards,

Kate

tareqkh · August 4, 2015, 23:12

Hey Kate,

Could you be more specific by sharing your case?

Best,

KateEisenhower · August 5, 2015, 03:09

Dear Tareqkh,

unfortunately I am not allowed to share this stuff. I'll try to describe it however. I have a part of a wing which I want to mesh with a boundary layer all around it. At the trailing edge gmsh has serious problems to create a decent mesh. I keep getting lots of non manifold faces, wrong oriented faces and so on. My default faces are located in the same area and I am quite sure this is related to the overall bad quality of the mesh at this location.
So my primary objective is to solve this problems and I hope the default face are going to disappear after that anyways.
If I wouldn't work with an imported stl geometry, I'm sure I could solve this by using transfinite entities around the trailing edge but somehow I have trouble combining them with my imported and extruded stl geometry.

Best regards,

Kate

August 4, 2015, 23:12	Answer	#23
tareqkh Senior Member CFD Join Date: Nov 2010 Location: United States Posts: 243 Rep Power: 17	Hey Kate, Could you be more specific by sharing your case? Best,

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August 4, 2015, 08:03		#21
rafa13 Member Rafael Marques Join Date: Mar 2014 Location: Almada/Mülheim a.d. Ruhr, Portugal/Germany Posts: 67 Rep Power: 12	Hi Kate, I think that gmsh2ToFoam are not for above OF1.4.1. When i get this default faces problem mostly it is because of the definition of the physical surfaces that are not defined. I you get default faces in the interior of the mesh try to remove the mesh with topoSet, or simply go to constant/polymesh/boundry and look if there are 0 faces if so delete the hole boundry and change the number of the top left of the file, this number indicates how many boundry do you have. try it maybe it works Kind regards Rafa Marques

August 4, 2015, 11:42		#22
KateEisenhower Senior Member Join Date: Mar 2015 Posts: 250 Rep Power: 12	Hi Rafael, thanks for your opinion! Unfortunately there are more than 0 faces in it. However, I'll have a look at topoSet! Best regards, Kate

August 5, 2015, 03:09		#24
KateEisenhower Senior Member Join Date: Mar 2015 Posts: 250 Rep Power: 12	Dear Tareqkh, unfortunately I am not allowed to share this stuff. I'll try to describe it however. I have a part of a wing which I want to mesh with a boundary layer all around it. At the trailing edge gmsh has serious problems to create a decent mesh. I keep getting lots of non manifold faces, wrong oriented faces and so on. My default faces are located in the same area and I am quite sure this is related to the overall bad quality of the mesh at this location. So my primary objective is to solve this problems and I hope the default face are going to disappear after that anyways. If I wouldn't work with an imported stl geometry, I'm sure I could solve this by using transfinite entities around the trailing edge but somehow I have trouble combining them with my imported and extruded stl geometry. Best regards, Kate