[ANSYS Meshing] Meshing Micro Channel with surface Roughness

jonheb · February 5, 2018, 09:04

Hi there,

I am trying to model a micro channel using the K-omega SST turbulence model.

Firstly I modeled this for smooth flow and everything was great and I was getting a Y+ of 1. Now I have added a surface roughness the Y+ has shot up to 100, I have read the law of the wall and adjusted my geometry appropriately and my roughness size according to the virtually shifting wall but my Y+ is still up around 20-50, I have made many attempts at adjusting the mesh but nothing seems to bring it down.

Any recommendations???

If any more info is required please ask

Far · February 5, 2018, 11:26

What is the point of of resolving the viscous sublayer?

jonheb · February 8, 2018, 18:52

Its so that I can see how surface roughness influences heat transfer in additively manufactured gas turbine vanes.

apologies for taking so long to get back.

jonheb · February 14, 2018, 07:31

Hey there its because we want to monitor the heat transfer effects from the rough surface.

February 5, 2018, 09:04	Meshing Micro Channel with surface Roughness	#1
jonheb New Member Jonathan Join Date: Jan 2018 Location: Belfast Posts: 6 Rep Power: 8	Hi there, I am trying to model a micro channel using the K-omega SST turbulence model. Firstly I modeled this for smooth flow and everything was great and I was getting a Y+ of 1. Now I have added a surface roughness the Y+ has shot up to 100, I have read the law of the wall and adjusted my geometry appropriately and my roughness size according to the virtually shifting wall but my Y+ is still up around 20-50, I have made many attempts at adjusting the mesh but nothing seems to bring it down. Any recommendations??? If any more info is required please ask

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February 5, 2018, 11:26		#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	What is the point of of resolving the viscous sublayer?

February 8, 2018, 18:52		#3
jonheb New Member Jonathan Join Date: Jan 2018 Location: Belfast Posts: 6 Rep Power: 8	Its so that I can see how surface roughness influences heat transfer in additively manufactured gas turbine vanes. apologies for taking so long to get back.

February 14, 2018, 07:31		#4
jonheb New Member Jonathan Join Date: Jan 2018 Location: Belfast Posts: 6 Rep Power: 8	Hey there its because we want to monitor the heat transfer effects from the rough surface.