CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   STAR-CCM+ (http://www.cfd-online.com/Forums/star-ccm/)
-   -   Star CCM+ Exponentials Syntax?? (http://www.cfd-online.com/Forums/star-ccm/94219-star-ccm-exponentials-syntax.html)

 RobH November 9, 2011 12:43

Star CCM+ Exponentials Syntax??

I trying to create my own viscosity field function. The definition is to be set as k*\$StrainRate^n. k and n are known constants. My problem is, what is the correct syntax in Star CCM+ for the exponent. Start CCM+ does not seem to recognise '^' and I can't find the right operator else where.

Thanks for your help (I'm new at CFD)

 Pauli November 9, 2011 13:32

pow(\$x,\$y) -x raised to the power of y

 willimanili November 10, 2011 03:01

In your case the fieldfunction should be k*pow(\$StrainRate,n)

 RobH November 10, 2011 07:06

 sabrina January 29, 2015 08:22

Quote:
 Originally Posted by Pauli (Post 331408) pow(\$x,\$y) -x raised to the power of y

\$AbsoluteTotalPressure*1.2*pow(\$MachNumber,2)*((1. 2*pow(\$MachNumber,2))/((2.4*pow(\$MachNumber,2))-0.166666667))^2.5

it's a long formula, and I cant find the errors

for power is always used "pow"? and "^"?

 Arthur February 5, 2015 06:43

Quote:
 Originally Posted by sabrina (Post 529513) please and here \$AbsoluteTotalPressure*1.2*pow(\$MachNumber,2)*((1. 2*pow(\$MachNumber,2))/((2.4*pow(\$MachNumber,2))-0.166666667))^2.5 it's a long formula, and I cant find the errors for power is always used "pow"? and "^"?
Sabrina the operator "^" is not used in star-ccm the error in your formula is exactly this one at the end.

Take a look at the user guide in Using Tools > Using Field Functions > Field Function Programming Reference > Miscellaneous Functions for reference...

 sabrina February 5, 2015 07:53

Quote:
 Originally Posted by Arthur (Post 530516) Sabrina the operator "^" is not used in star-ccm the error in your formula is exactly this one at the end. Take a look at the user guide in Using Tools > Using Field Functions > Field Function Programming Reference > Miscellaneous Functions for reference...
thank you Arthur, I have corrected, can you tell me if you have idea, in star CCM+, we can do a new field function with derivative like (dT/dy) or (dV/dy) ?

 All times are GMT -4. The time now is 00:18.