foamCalc addSubtract

jclement · July 27, 2012, 10:32

Dear Foamers,

I am new to OpenFoam and would like to realize a substract between two vector fields.
I have tried to use foamCalc but without success:

"foamCalc addSubtract UL ULMean"Create time

Create mesh for time = 0

--> FOAM FATAL ERROR:
Invalid calcMode: ULMean
Valid calcModes are add and subtract

From function calcTypes::addSubtract:

reCalc
in file basic/addSubtract/addSubtract.C at line 229.

FOAM exiting

If someone have a idea it would be great.

my goal is to calculate the RMS vorticity fluctuation,is somebody know how to do it?

thank you for your help!!

Bernhard · July 30, 2012, 03:21

The correct syntax would be something like

Code:

foamCalc addSubtract UL subtract -field ULmean -resultName ULfluct

or something like that.

A better way to calculate the RMS values, may be to use function objects during runtime: http://www.cfd-online.com/Forums/ope...ldaverage.html

jclement · August 3, 2012, 18:19

Thank you Bernard I have tried your second solution and it works.

July 27, 2012, 10:32	foamCalc addSubtract	#1
jclement New Member Join Date: May 2012 Posts: 2 Rep Power: 0	Dear Foamers, I am new to OpenFoam and would like to realize a substract between two vector fields. I have tried to use foamCalc but without success: "foamCalc addSubtract UL ULMean"Create time Create mesh for time = 0 --> FOAM FATAL ERROR: Invalid calcMode: ULMean Valid calcModes are add and subtract From function calcTypes::addSubtract:reCalc in file basic/addSubtract/addSubtract.C at line 229. FOAM exiting If someone have a idea it would be great. my goal is to calculate the RMS vorticity fluctuation,is somebody know how to do it? thank you for your help!!

July 30, 2012, 03:21		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 22	The correct syntax would be something like Code: foamCalc addSubtract UL subtract -field ULmean -resultName ULfluct or something like that. A better way to calculate the RMS values, may be to use function objects during runtime: http://www.cfd-online.com/Forums/ope...ldaverage.html HakikiCanakkaleli likes this.

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August 3, 2012, 18:19		#3
jclement New Member Join Date: May 2012 Posts: 2 Rep Power: 0	Thank you Bernard I have tried your second solution and it works.