How To Get A value in C In An Output Parameter Based On An Expression In CFD-Post

Shomaz ul Haq · April 25, 2016, 05:08

Dear all,

Hi. Hope all are well. I wanted to ask how can I get a workbench output parameter to display a value of an expression of name OutTempRange having a value of maxVal(Temperature)@out - minVal(Temperature)@out It gives a value in K instead of C in workbench parameters tab. The thing is it calculates the difference value first and then subtracts 273.15 to convert it into C. But this gives wrong value obviously in C. I tried subtracting 273.15 from both terms in CFD-Post but it gives error of inconsistent units for subtraction. Would be grateful for help. Thank you.

urosgrivc · April 25, 2016, 06:40

((maxVal(Temperature)@out - minVal(Temperature)@out)/(1[K]))-273.15

Substract -> divide by 1[K] (so it is dimentionless) -> substract (dimentionless 273.15)

If you divide by 1[unit] units can go away, as you canot substract x[unit]-y[without unit]
even if you would multiply instead substract your expression you would get K^2

if you want you can than also multiply by (1[C]) in the end to get the [C]in the end, but it is problably not necesery. expresion abbove now doesent have units it is just a number.

Shomaz ul Haq · April 25, 2016, 13:17

Thanks a lot urosgrivc! How couldn't I think of that? Thanks brother.

April 25, 2016, 05:08	How To Get A value in C In An Output Parameter Based On An Expression In CFD-Post	#1
Shomaz ul Haq Senior Member Shomaz ul Haq Join Date: Aug 2015 Location: Islamabad, Pakistan Posts: 205 Rep Power: 11	Dear all, Hi. Hope all are well. I wanted to ask how can I get a workbench output parameter to display a value of an expression of name OutTempRange having a value of maxVal(Temperature)@out - minVal(Temperature)@out It gives a value in K instead of C in workbench parameters tab. The thing is it calculates the difference value first and then subtracts 273.15 to convert it into C. But this gives wrong value obviously in C. I tried subtracting 273.15 from both terms in CFD-Post but it gives error of inconsistent units for subtraction. Would be grateful for help. Thank you.

April 25, 2016, 13:17		#3
Shomaz ul Haq Senior Member Shomaz ul Haq Join Date: Aug 2015 Location: Islamabad, Pakistan Posts: 205 Rep Power: 11	Thanks a lot urosgrivc! How couldn't I think of that? Thanks brother. urosgrivc likes this.

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April 25, 2016, 06:40		#2
urosgrivc Senior Member urosgrivc Join Date: Dec 2015 Location: Slovenija Posts: 365 Rep Power: 11	((maxVal(Temperature)@out - minVal(Temperature)@out)/(1[K]))-273.15 Substract -> divide by 1[K] (so it is dimentionless) -> substract (dimentionless 273.15) If you divide by 1[unit] units can go away, as you canot substract x[unit]-y[without unit] even if you would multiply instead substract your expression you would get K^2 if you want you can than also multiply by (1[C]) in the end to get the [C]in the end, but it is problably not necesery. expresion abbove now doesent have units it is just a number.