rough wall

feizaghaee · August 2, 2013, 10:15

Hi experts.
I'm modeling a two phased flow water and air. I have rough wall with roughness of 4 mm. depth of water is about 10 cm and the velocity is nearly 4.5 m/s. I use k-e turbulent model. how much should be the distance of the mesh grid from the wall?

ghorrocks · August 3, 2013, 06:05

Do a mesh resolution sensitivity check and find out for yourself. There are no shortcuts - we can only guess and that is just a starting point. From there you have to refine it with a sensitivity check anyway.

feizaghaee · August 3, 2013, 15:30

thank you very much.

August 2, 2013, 10:15	rough wall	#1
feizaghaee Senior Member moein Join Date: Dec 2009 Posts: 132 Rep Power: 16	Hi experts. I'm modeling a two phased flow water and air. I have rough wall with roughness of 4 mm. depth of water is about 10 cm and the velocity is nearly 4.5 m/s. I use k-e turbulent model. how much should be the distance of the mesh grid from the wall?

August 3, 2013, 06:05		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	Do a mesh resolution sensitivity check and find out for yourself. There are no shortcuts - we can only guess and that is just a starting point. From there you have to refine it with a sensitivity check anyway. feizaghaee likes this.

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August 3, 2013, 15:30		#3
feizaghaee Senior Member moein Join Date: Dec 2009 Posts: 132 Rep Power: 16	thank you very much.