Using Residuals in CFX Pre to creat an Expression ?

Timmsen · August 19, 2014, 10:18

Hi,

I've got a simple problem in CFX Pre 15.0 but can't handle it.

I want to create some Expressions to monitor some Variables during the Solver Run. Therefor i want to make an expression that counts ("countTrue") the number of nodes in the grid that have bigger Residuals than an specific value for every Timestept (or Loop). During the Solver Run i want to plot this expression and observe the convergence.

I already know how to do the Syntax and all the stuff. But I can't find the Residuals (U Mom, V Mom, P Mass...) as Variables in the area where you usually create the expression.

Isn't it possible to use the Residuals like usual variables ?

Ludvik · August 20, 2014, 04:06

In "Output Control > Results > Output Equation Residuals" swith setting to "All".

Timmsen · August 20, 2014, 05:55

That's only to record the Residuals for the Solver or CFX Post. But i want to use them as an variable to create a new Expression, already in CFX Pre.

Opaque · August 20, 2014, 07:36

Residuals are not available via CEL.

Timmsen · August 20, 2014, 08:21

That's what I've been asking for. Thank U for the answer.

August 19, 2014, 10:18	Using Residuals in CFX Pre to creat an Expression ?	#1
Timmsen New Member Join Date: Aug 2014 Location: Germany Posts: 3 Rep Power: 11	Hi, I've got a simple problem in CFX Pre 15.0 but can't handle it. I want to create some Expressions to monitor some Variables during the Solver Run. Therefor i want to make an expression that counts ("countTrue") the number of nodes in the grid that have bigger Residuals than an specific value for every Timestept (or Loop). During the Solver Run i want to plot this expression and observe the convergence. I already know how to do the Syntax and all the stuff. But I can't find the Residuals (U Mom, V Mom, P Mass...) as Variables in the area where you usually create the expression. Isn't it possible to use the Residuals like usual variables ?

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August 20, 2014, 04:06		#2
Ludvik Member Join Date: Apr 2009 Location: Czech Republic Posts: 65 Rep Power: 18	In "Output Control > Results > Output Equation Residuals" swith setting to "All".

August 20, 2014, 05:55		#3
Timmsen New Member Join Date: Aug 2014 Location: Germany Posts: 3 Rep Power: 11	That's only to record the Residuals for the Solver or CFX Post. But i want to use them as an variable to create a new Expression, already in CFX Pre.

August 20, 2014, 07:36		#4
Opaque Senior Member Join Date: Jun 2009 Posts: 1,803 Rep Power: 32	Residuals are not available via CEL.

August 20, 2014, 08:21		#5
Timmsen New Member Join Date: Aug 2014 Location: Germany Posts: 3 Rep Power: 11	That's what I've been asking for. Thank U for the answer.