CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   3d mesh of bluff body for LES (http://www.cfd-online.com/Forums/fluent/39285-3d-mesh-bluff-body-les.html)

Lukasz Mosakowski January 17, 2006 11:21

3d mesh of bluff body for LES
 
I'm trying to perform flow analysis around a 3-d bluff body, a brick, and then perform a large eddy simulation (LES). I assume that i need a domain as well, (please tell me if i'm correct) for which i need to create a mesh. I meshed both volumes with a hex map mesh, however, i am not sure if that is appropriate for a LES. I am also not sure what boundary conditions to apply, especially for the brick within the domain. Whenever i attempt a simulation, it seems that the brick itself, not the domain, seems to have no effect on the flow and fluent seems to ignore it. Perhaps my meshing is wrong or boundary conditions. Please, if you have any advice, I would love to hear it. Thank You.

J. Kim January 17, 2006 12:12

Re: 3d mesh of bluff body for LES
 
Did you define conditions for the flow and solid part? If your brick is defined as a fluid, you may have a flow inside the bluff body.

Lukasz Mosakowski January 17, 2006 14:37

Re: 3d mesh of bluff body for LES
 
i did specify the actual brick as solid and domain as fluid. However, do i need additional specifications for boundary conditions on the inner brick?

J. Kim January 17, 2006 15:06

Re: 3d mesh of bluff body for LES
 
If you defined wall boundaries for the surfaces of your brick (I'm sure you did), please send your case and data files to me.

Before that, please visualize your grids (of brick, walls, inlet, outlet, etc) to verify you used right boundary conditions.

Lukasz Mosakowski January 18, 2006 00:09

Re: 3d mesh of bluff body for LES
 
thank you very much for your help. I will do that as soon as possible.


All times are GMT -4. The time now is 04:21.