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help with TGrid please!

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Old   September 4, 2007, 04:32
Default help with TGrid please!
  #1
MAC
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Hi everyone, I'm trying to create a volume mesh from a surface mesh (that is created in Gambit) in the TGrid. There are no problems in relation to free nodes or unused nodes. The Highest skewness in my surface meshs is 0.845. but when I'm trying to creat the volume mesh from it, TGrid can not create initial mesh. It give me an error that there are something around 250 nodes that can not be meshed. I don't know what can I do about it. can anyone help me?

Thanks in advance
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Old   September 6, 2007, 17:40
Default Re: help with TGrid please!
  #2
red lemon
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improve surface mesh to face skew <0.75
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Old   September 7, 2007, 01:13
Default Re: help with TGrid please!
  #3
rosol
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Dear all

Please tell me how can I estimate the value of skew and what the meaning of it because I suffer from same proplem I canot meshing the volume
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Old   September 8, 2007, 09:25
Default Re: help with TGrid please!
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MAC
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Thanks alot red lemon for your reply,

I did your advice and improved my surface mesh to face skew <0.75, but it didn't work. can you give me another advice?
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Old   September 8, 2007, 23:43
Default Re: help with TGrid please!
  #5
Diego Flores
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Generally when your mesh is not initialized, the mesh surface have problems, you must check if there's not duplicated shells or shells intersecting themselves. if all above it's ok, you must check that your mesh has an element distribution uniform to avoid all kind of problems that you're finding.So the skew must > 0.75. Other think, you must check in Control menu, improve quality.

Regards

Diego from Mexico

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Old   September 9, 2007, 07:41
Default Re: help with TGrid please!
  #6
MAC
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Hi,

Thanks Diego for your reply. I checked my surface mesh and there were no problems like duplicated shells or shells that are intersected with each other, but I don't understand about improve quality in the control menu. Could you help me where I can find some descreptions about it? (I also don't find why must my grid has the skew greater than 0.75?)

Best regards
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Old   September 10, 2007, 06:25
Default Re: help with TGrid please!
  #7
vyankatesh bagal
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hi, you can try with "add interior nodes" and "perturb nodes" option in automesh controls panel. also increase the number of attempts.(let us say 10 instead of 4 default).

Regards, Vyankatesh
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Old   September 16, 2007, 04:10
Default Re: help with TGrid please!
  #8
MAC
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Hi,

Thanks a lot Vyankatesh for your reply. I respect your advice and got this error:

"Error: face_ctr outside c47130 circumsphere. Error Object: ()

Mesh initialization not completed."

Could you tell me why I get this error and how I can mesh my volume?
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Old   September 21, 2007, 07:15
Default Re: help with TGrid please!
  #9
vyankatesh
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check for the free nodes. if not then better improve the surface mesh.

vyankatesh
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