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Old   February 19, 2000, 03:07
Default volume generation
  #1
kate
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Hi,

I'm experiencing some problems in volume generation. I have this neu.gz file which I import to gambit and it's a 2D mesh. I'm trying to construct a cylinder using the sweep real faces command by the means of a rigid sweep and specifying a vector. But I get a error msg that says "cannot perform function on xxxxxx-face with associated non-real geomety". What is the problem???

Regards, Kate
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Old   February 19, 2000, 11:21
Default Re: volume generation
  #2
Kai Kang
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there must be some virtual geometry in your model, if you check either your volume or face or edge, you will find some are lable like v_edge.xx, v_face.xx.
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Old   February 19, 2000, 11:25
Default Re: volume generation
  #3
Frank
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If you import a mesh into gambit, it becomes virtual (!!) geometry. Virtual says, that you do not have the full functionality of gambit for further operations, such as sweeping, uniting... 1.) Try "sweep edge" or "rotate edge". I think, this works with virtual geometry. After rotating or sweeping build a volume. 2.) try "convert virtual-real" in "faces". If this works you can try to sweep the real face

Frank
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Old   February 22, 2000, 12:38
Default Re: volume generation
  #4
Pavel Strasak
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The second way is the export of acis file and re-read it in new task. This step deletes the virtual entities.

Best Regards
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Old   February 22, 2000, 15:30
Default Re: volume generation
  #5
Frank
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But this often does not work: if you read the (exported) sat-file, GAMBIT hangs up.
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Old   February 23, 2000, 04:19
Default Re: volume generation
  #6
Pavel Strasak
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Of course, because the basic geometry is damaged. 1) Then it is problem with iges translation. Sometimes you can get some information on shade model, because distorted faces are in wireframe model, not shade. 2) Those faces are not converted in real geometry. Then you must convert the edges and recreate new real face. 3) When the face is very curved the best way is to split it and then convert the edges in real.

Pa.St.
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Old   February 24, 2000, 02:36
Default Re: volume generation
  #7
Kate
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Frank,

I've tried the methods that u've suggested but they still dun work. Would u like a copy of my grid file? pls email me ASAP. Thanx a million.
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Old   February 24, 2000, 15:48
Default Re: volume generation
  #8
Frank
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Yust before one question: why so complicated ? a meshed cylinder is made in gambit in 5 minutes. Frank
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Old   February 24, 2000, 21:51
Default volume generation
  #9
kate
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Frank,

That's why I think you've gotta see the mesh. It's a flat 2d almost circular mesh with 3 zones. As I've asked you earlier, would you like to have a copy of it? I've been told to reconstruct 3d volume by inputing the grid coordinates all over again, but that's really ridiculous and I think gambit def has the funtions to do it. It's just that I dun knoe how. Thanx.
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Old   February 25, 2000, 17:25
Default Re: volume generation
  #10
Frank
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ok, I'll try it.
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