Create field for Celsius Temperatures

bastil · August 24, 2017, 02:59

Hello all,

I want to export temperatures out of OpenFOAM 5.x in Celsius-Format. Therefore, I need a way to create Celsius-fields out of Kelvin-fields.

In general, something like the following should to the trick:

Code:

postProcess -fields "(T 273.15)" -func subtract

However, this functions requires two fields and does not accept the scalar "273.15". Any other ideas? Thanks.

akidess · August 24, 2017, 03:43

Well, as a workaround you could just add a volScalarField Toffset with zeroGradient boundary conditions and an initial value of 273K in the time directories you want to export and then proceed with postProcess. In the past I would use my foamCalcEx tool, but I'm not sure if it still works with OF5.

bastil · August 24, 2017, 08:12

Thanks. this leads me to foamCalc. I did not know this before:

http://caefn.com/openfoam/utilities-foamcalc

Code:

foamCalc addSubtract T subtract -value 273.15 -resultName Tdeg

August 24, 2017, 02:59	Create field for Celsius Temperatures	#1
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Hello all, I want to export temperatures out of OpenFOAM 5.x in Celsius-Format. Therefore, I need a way to create Celsius-fields out of Kelvin-fields. In general, something like the following should to the trick: Code: postProcess -fields "(T 273.15)" -func subtract However, this functions requires two fields and does not accept the scalar "273.15". Any other ideas? Thanks.

August 24, 2017, 03:43		#2
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	Well, as a workaround you could just add a volScalarField Toffset with zeroGradient boundary conditions and an initial value of 273K in the time directories you want to export and then proceed with postProcess. In the past I would use my foamCalcEx tool, but I'm not sure if it still works with OF5. __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

August 24, 2017, 08:12		#3
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Thanks. this leads me to foamCalc. I did not know this before: http://caefn.com/openfoam/utilities-foamcalc Code: foamCalc addSubtract T subtract -value 273.15 -resultName Tdeg

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