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-   -   [GAMBIT] geometry (http://www.cfd-online.com/Forums/ansys-meshing/69415-geometry.html)

bob12 October 22, 2009 06:16

geometry
 
hi all
if i modelling a tube where into have a flow, the lateral surface is one or two?
i suppose that is one connect surface.
also i have split a volume, tha are connect(the volume), with a surface and generated two volume real connected. but gambit give me a warn: the connected geometry may be imprinted by the request operation.
What do it mean?

thank you all for the attention, i'm not doing without us!!

-mAx- October 22, 2009 08:05

Quote:

Originally Posted by bob12 (Post 233656)
hi all
if i modelling a tube where into have a flow, the lateral surface is one or two?i suppose that is one connect surface.

I don't understand what you are trying to explain :rolleyes:

Quote:

Originally Posted by bob12 (Post 233656)
also i have split a volume, tha are connect(the volume), with a surface and generated two volume real connected. but gambit give me a warn: the connected geometry may be imprinted by the request operation.
What do it mean?

Is your operation successfull? if yes, forget the warning
If not, check if the surface splits all the volume

bob12 October 22, 2009 08:45

sorry for my english but it's bad...
however in a pipe i create two volume one for solid and one for liquid, so the querry is: how many surface can i do in the interface?
i hope that now is clear..
thank you vary much

-mAx- October 22, 2009 08:54

You shouldn't model and mesh the solid region (except in special cas like thermal conduction, etc....)
Else you don't have to take care of your "interfaces" (which are not interface --> cf sliding mesh)
Indeed once you export your mesh, gambit takes all the surfaces which are not defined as specific BC, and defines them as wall
Basically if you mesh a cylinder (3 surfaces: top + bottom + lateral), you define the top and bottom as inlet/outlet, you export the mesh , and you get 4 BC: inlet/outlet and the rest (lateral) as wall.
Did I reply your query?

bob12 October 22, 2009 10:03

Quote:

Originally Posted by -mAx- (Post 233689)
You shouldn't model and mesh the solid region (except in special cas like thermal conduction, etc....)
Else you don't have to take care of your "interfaces" (which are not interface --> cf sliding mesh)
Indeed once you export your mesh, gambit takes all the surfaces which are not defined as specific BC, and defines them as wall
Basically if you mesh a cylinder (3 surfaces: top + bottom + lateral), you define the top and bottom as inlet/outlet, you export the mesh , and you get 4 BC: inlet/outlet and the rest (lateral) as wall.
Did I reply your query?

i don't understand this:
  • cf sliding mesh
suppose that are important model the solid, the surface lateral is one or two?

-mAx- October 22, 2009 10:16

*for sliding mesh, you need to have Boundary Conditions called interface (but it has nothing to do with what you mean)

*hmmm, we are not understanding us together.
Lets take a cylinder, in the middle you have a marble.
So the flow will flows in the cylinder, but not in the marble (just around)
So you need to substract the marble from the cylinder (boolean operation).
You get ONE volume, but with a hole in the middle (marble substracted).
So the hole represents the solid, but it is not mesh/modelised...
At the "interface" between the flow and the marble there is only one surface representing the outer surface from the marble (will be set as wall in the BC panel).
hope it helps (i can also german and french if it helps)

bob12 October 22, 2009 10:31

thank so much
sorry if i didn't expleined well, and it's better in english


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