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-   -   Has the kind of mesh influence on the solving method used by software? (http://www.cfd-online.com/Forums/star-ccm/98487-has-kind-mesh-influence-solving-method-used-software.html)

 fshak92 March 12, 2012 11:07

Has the kind of mesh influence on the solving method used by software?

1) In a conjugate heat transfer case for finding the HTC and LocalHTC I've meshed my model(a body surrounded by air) in two ways(first polyhedral and second Trimmer).
There isn't any velocity and i've used the segregated solver and all the conditions are same for both cases.
In trimmer case Just the energy equation is solved but for polyhedral, the momentum and continuity equations are solved as well.
I wonder if someone tells me how the kind of mesh influences on solving equations in my case.

2)And also do you know how Heat transfer coefficient and LocalHTC are calculated by the software? the tutorial hasn't explained in a good way.

 siara817 March 13, 2012 13:35

How was the quality of the mesh for the both cases?
If the quality of the mesh is low in any case, then the solution will not converge.
I hope you know how to check for example Cell quality in STAR CCM.
Good luck

 MFitl March 14, 2012 03:07

Quote:
 Originally Posted by omid88 (Post 348956) 1) 2)And also do you know how Heat transfer coefficient and LocalHTC are calculated by the software? the tutorial hasn't explained in a good way.
The definition of the HTC is:

=

Depending on the is different for the same .

For the HTC is the temperature you need to set in Tools|FieldFunctions|Heat Transfer Coefficient.

For the LocalHTC is the local temperature of the cell next to the wall.

 abdul099 March 15, 2012 04:27

The solver should do the same for both meshes. Can you create a summary report on both cases and compare them for different settings (apart from mesh settings)?

 fshak92 March 15, 2012 08:02