Surface roughness and y+

isaac_h · November 15, 2023, 11:55

Hi!

I have added surface roughness in my k-omega sst model and I don't know how to think about the y+ value. For a smooth pipe it should be around 1, but I can't get it below 20 with my added roughness and I can't find any information about this when I try to google, only for the wall functions but not when I want to be in the viscous layer.

Would really appreciate some insight in this and how to think or if anyone know where I can find information about the y+ for the k-omega sst model with roughness.

Thanks!!

isaac_h · November 16, 2023, 08:09

Up! Would really need some help here if someone knows!!

November 15, 2023, 11:55	Surface roughness and y+	#1
isaac_h New Member Join Date: Oct 2023 Posts: 10 Rep Power: 3	Hi! I have added surface roughness in my k-omega sst model and I don't know how to think about the y+ value. For a smooth pipe it should be around 1, but I can't get it below 20 with my added roughness and I can't find any information about this when I try to google, only for the wall functions but not when I want to be in the viscous layer. Would really appreciate some insight in this and how to think or if anyone know where I can find information about the y+ for the k-omega sst model with roughness. Thanks!!

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November 16, 2023, 08:09		#2
isaac_h New Member Join Date: Oct 2023 Posts: 10 Rep Power: 3	Up! Would really need some help here if someone knows!!