# roughness of thin surface

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 October 27, 2003, 23:12 roughness of thin surface #1 colins Guest   Posts: n/a 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.

 October 28, 2003, 13:41 Re: roughness of thin surface #2 Robin Guest   Posts: n/a 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

 October 28, 2003, 23:03 Re: roughness of thin surface #3 colins Guest   Posts: n/a 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

 October 29, 2003, 04:05 Re: roughness of thin surface #4 njzeo Guest   Posts: n/a 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

 October 29, 2003, 13:06 Re: roughness of thin surface #5 Robin Guest   Posts: n/a Upgrade to 5.6. -Robin

 October 30, 2003, 01:13 Re: roughness of thin surface #6 colins Guest   Posts: n/a To Robin, thank you.I have done it. -colins

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