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Old   July 27, 2012, 09:32
Default foamCalc addSubtract
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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

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!!
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Old   July 30, 2012, 02:21
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The correct syntax would be something like
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:
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Old   August 3, 2012, 17:19
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Thank you Bernard I have tried your second solution and it works.
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