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Old   April 25, 2012, 07:00
Default udf problem
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studen
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#include "udf.h"

DEFINE_PROPERTY(v_viscosity, c, t)
{

real temp = C_T(c, t);
real mu_lam;

if (25<= temp <=45)
{
mu_lam1=-7.5907e-7*temp*temp;
mu_lam2=3.8968e-4*temp;
mu_lam3=4.0130e-2;
mu_lam4=mu_lam1+mu_lam2+mu_lam3
mu_lam5=exp(1/mu_lam4)
mu_lam6=4.485*mu_lam5

//mu_lam = 4.485e-8*(exp(1/((-7.5907e-7*temp*temp)+(3.8968e-4*temp)+4.0130e-2))); (this is the formula which it has to solve if written in one line doesnt work so it has been broken down)//
}
return mu_lam6;
}

guys my question is

1. when i set the wall conditions at 25 and the temp of fluid at 45 and initialze. it should show me the prandtl number in btw these ranges, using the viscosity function u can calculate the viscosity at 25 and corresponding prandtl number which is viscosity dependent (pr range is from 1.3*10^4 (@25) to 1.4*10^5 (@45)) but it doesnt show the above values, i need some one to please tell me what's wrong.

if some one figures it out please post it at the earliest

thanks in advance
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