Surface roughness?

sieginc. · September 16, 2012, 00:20

If I have an object like this:

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.

September 16, 2012, 00:20	Surface roughness?	#1
sieginc. Member adam Join Date: Oct 2011 Posts: 52 Rep Power: 14	If I have an object like this: 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.

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September 17, 2012, 07:04		#2
siara817 Senior Member siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 220 Rep Power: 17	I think it depends on the fineness of the mesh close to the wires.