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modeling a pipe with both internal and external flow

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Old   July 7, 2014, 11:41
Default modeling a pipe with both internal and external flow
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amir
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Hi dear friends
I want model a pipe with both internal and external flow ( a pipe of a heat exchanger for for ex).
How can I do this?
tanx
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Old   July 7, 2014, 17:12
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Euh, just do it?
Make a model of a pipe, mesh it, apply boundary conditions, etc, just like in any other CFD problem.

If you have problems, be more specific.
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Old   July 9, 2014, 12:05
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Thanks dear pakk
I have problem with boundary condition and meshing of this
There are two flows, first in pipe and second on pipe.
Should i mesh domain separately?

Last edited by amir_14; July 9, 2014 at 16:11.
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Old   July 9, 2014, 14:14
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hey dear Amir,
You surely need to define separate zones in this case you've defined.
I had the same experience and suggest you mesh them separately in Ansys Meshing soft
and then first read one of the mesh in Fluent and append the other mesh in Fluent as described below:
In Fluent (15) -> Mesh/zone/append case file
now in the cell zone conditions you can manage each zone separately.
I forgot to mention it's better to name each face in Ansys Meshing or Design Modeler before updating meshes to have comfort in applying boundary conditions.
Good Luck
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Old   July 9, 2014, 17:18
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Quote:
Originally Posted by hamidreza118 View Post
hey dear Amir,
You surely need to define separate zones in this case you've defined.
I had the same experience and suggest you mesh them separately in Ansys Meshing soft
and then first read one of the mesh in Fluent and append the other mesh in Fluent as described below:
In Fluent (15) -> Mesh/zone/append case file
now in the cell zone conditions you can manage each zone separately.
I forgot to mention it's better to name each face in Ansys Meshing or Design Modeler before updating meshes to have comfort in applying boundary conditions.
Good Luck
Thanks my friend
your post extremely helped me
Should i try for grid convergence separately?
Can you help me about this?
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