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Old   October 27, 2003, 23:12
Default roughness of thin surface
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colins
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hi,friends I need to difine different roughness on the twos of thin surface,who knows how to? I have referred to this topic, http://www.cfd-online.com/Forum/cfx_....cgi?read=4397 but I can not distinguish the two surfaces,e.g. which one is the inside one or which one is the upper,anyone could help me? thanks.
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Old   October 28, 2003, 13:41
Default Re: roughness of thin surface
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Robin
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Hi Colins,

To find the direction, define an outlet boundary condition to the surface. The arrows will be on the side which is touching the fluid. You can then switch it back to a wall and apply the appropriate B.C.

-Robin
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Old   October 28, 2003, 23:03
Default Re: roughness of thin surface
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colins
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To robin, I have tried following what you suggested,but I cannot apply a inlet/outlet boundary on a subdomain surface,the error reported was "The surface list 'Solid 4.4' contains the following error(s). Solid 4.4 is not an exterior face of a domain." Btw,I am using CFX5.5 -colins
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Old   October 29, 2003, 04:05
Default Re: roughness of thin surface
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njzeo
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first,you can creat a subdomain which include the thinsurface you will defined,then in the condition boundary,you'd creat the thinsurface,and you may define different roughness on the two side of the thinsurface.may you succeed1
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Old   October 29, 2003, 13:06
Default Re: roughness of thin surface
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Robin
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Upgrade to 5.6.

-Robin
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Old   October 30, 2003, 01:13
Default Re: roughness of thin surface
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colins
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To Robin, thank you.I have done it. -colins
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