UDF Wall functions in Fluent -- CFD Online Discussion Forums

June 15, 2011, 15:45	UDF Wall functions in Fluent	#1
syler3321 Member ralph Join Date: Jun 2010 Location: Calgary Alberta Posts: 38 Rep Power: 15	Hi, I was reading the manuals for Fluent's UDF and chanced upon the wall function. This is what it said. Your UDF will need to compute the real value of the wall functions U+, dU+, and dY+ for laminar and turbulent regions and return them to the solver. My question is: what is dU+ and dY+? Also are these the only things i have to worry about when defining my own wall functions? I think i might have to alter the shear stress as well dont i? Please help. Regards Ralph

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