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Old   February 12, 2008, 12:33
Default Need some help with mashing a cylinder
  #1
Laura Leitch
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hi guys i need to mash a cylinder without mashing a sphere which is inside the cylinder. i have been trying to do so but every time i examine the mash, it shows i have mashed the sphere as well. please some 1 help me.

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Old   February 12, 2008, 16:34
Default Re: Need some help with mashing a cylinder
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Manfred
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You have to subtract the sphere mesh from cylinder volume, then you can mesh the new volume. The problem is that Gambit is unable to mesh volumes with a missing part, like in this case, so you need to divide the volume at least in two parts.

Hope it will help
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Old   February 13, 2008, 01:52
Default Re: Need some help with mashing a cylinder
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rosol
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you need to divide the volumes i.e specify the volume of sphere and volume of cylinder and then meshing each volume seperatly

I hoope this will help
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Old   February 13, 2008, 09:53
Default Re: Need some help with mashing a cylinder
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Laura Leitch
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Thank you very much for your kind help. Im trying to do my final year project on gambit which is related to industrial air and vapour flow. Technically i have to create a cylinder and put a sphere at the middle of the cylinder and eventually generate a mash without being being able to generate the mash of the sphere. its been over 2 weeks im stuck at this point. I did most of the tutorials but still cant find anything similar to my problem. Just wondering if u would be kind enough to tell me brifly, how to divide a volume or may be few links to tutorials or documentation that might help. thank you very much in advance. Laura

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Old   February 13, 2008, 12:15
Default Re: Need some help with mashing a cylinder
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rosol
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As I think you must creat the two volumes first and then meshing them . 1-creating the vertices and edges of both spher and cylinder 2-creating the faces of spher 3-creating the faces of cylinder 4- The new faces of cylinder is found by subtract the faces of spher from the old faces of cylinder 5-creating the volumes of spher and cylinder 6-meshing buth volumes

Regards
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Old   February 16, 2008, 17:00
Default Re: Need some help with mashing a cylinder
  #6
Manfred
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If you search in google you can find tutorials by cornell university. The airfoil tutorial shows how you can subtract a face from another one, and the procedure for volumes is the same. You can also use axisymetric flow, it's much more simple to mesh and to solve.
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