Wallscale residual

siw · April 28, 2011, 12:01

Hi,

When running a simulation using the SST model with the automatic wall function a wallscale residual is plotted by CFX.

I've looked in the user guide but cannot find the answer. What is the variable that's being plotted?

Thanks

ghorrocks · April 28, 2011, 19:40

The solver runs a simple linear solver to get the distance to the walls for the wall scale variable. This variable is requierd for the SST model. It is very rare for this equation to fail to converge and rarely causes problems.

helvas · July 21, 2016, 08:27

Ghorrocks,

Can you explain wall scale variable more?

ghorrocks · July 21, 2016, 19:39

I recall it calculates it using a diffusion equation. So a simple linear equation, but one which CFX solves with an iterative solver.

April 28, 2011, 12:01	Wallscale residual	#1
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 742 Rep Power: 26	Hi, When running a simulation using the SST model with the automatic wall function a wallscale residual is plotted by CFX. I've looked in the user guide but cannot find the answer. What is the variable that's being plotted? Thanks

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April 28, 2011, 19:40		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,893 Rep Power: 144	The solver runs a simple linear solver to get the distance to the walls for the wall scale variable. This variable is requierd for the SST model. It is very rare for this equation to fail to converge and rarely causes problems.

July 21, 2016, 08:27		#3
helvas New Member Join Date: Jan 2016 Posts: 5 Rep Power: 10	Ghorrocks, Can you explain wall scale variable more?

July 21, 2016, 19:39		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,893 Rep Power: 144	I recall it calculates it using a diffusion equation. So a simple linear equation, but one which CFX solves with an iterative solver.