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meshing solid in Gambit

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Old   November 1, 2005, 16:56
Default meshing solid in Gambit
  #1
Ralf Schmidt
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Hi!

I want to calculate the heat transfer from a solid body to a fluid.

When I export my mesh from gambit to fluent, the volumes that are difined as solid have to be meshed as well, otherwise they will not be written.

In order to keep my mesh small I dont want to mesh the solid. How can I avoid that?

Any Help is appreciated!

Ralf
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Old   November 2, 2005, 04:32
Default Re: meshing solid in Gambit
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Razvan
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Try using "thermal conditions" from wall-boundary conditions panel. It could be a good enough approximation for your case!

Or if you are interested in thermal field inside the solid, then you must mesh it. In order to keep a low mesh count you could use non-conformal interface between solid and fluid regions. This way you could make a coarser ( tetrahedral, maybe) mesh for the solid region. Remember to specify "coupled" option when creating the interface!

Razvan
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Old   November 2, 2005, 11:42
Default Re: meshing solid in Gambit
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marco
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hi, i am simulating the heat transfer of a fluid in a pipe. but i have problems how to define the boundaries. i have meshed the walls and the fluid and i defined the walls as "solids" and the liquid as "fluid" in gambit (my 2D modell looks like three rectangles on above each other)

but how do i define the boundarys. of course i have the inlet and outlet. i defined the outer lines as walls and the inner lines of the pipe as "interior". (these lines are transition between solid and fluid)

but then fluent prints the error " adjacent cell threads are of different types" (which they are, solid and fluid)

but if i define the inner lines as walls too, the i can not simulate that the wall is heaten up by the fluid because i have to set a constant temperature for a wall. that is ok for the outer lines because there is a constant temperature, but how can i deal with the inner lines of the wall? thanx for your help
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