CFD Online Discussion Forums

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-   -   Surface roughness? (http://www.cfd-online.com/Forums/star-ccm/107035-surface-roughness.html)

sieginc. September 16, 2012 00:20

Surface roughness?
 
If I have an object like this:

http://imageshack.us/a/img440/2637/inductor.jpg

It's a model of an inductor, the coils are 18 gage wire. My question is do I need to apply a roughness to this surface, or will STAR recognize the "bumps" along the geometry? I had someone tell me that STAR will consider these surfaces smooth as part of wall treatment but applying a roughness seems unnecessary if the wires are modeled individually as they are. Now, if each coil pack was just a solid cylindrical shape then I could see why a roughness would be needed but I'm not sure.

siara817 September 17, 2012 07:04

I think it depends on the fineness of the mesh close to the wires.


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