Learning Forum

[DEBA]

HOW TO CREATE UDF FOR THIS

[DEBA]

 

The following code is ok sir?

#include "udf.h"

#define mu_p 0.00123

#define H_ct 0.48

#define k_0 3.96

#define k_inf 1.71

#define gamma_c 5.0

DEFINE_PROPERTY(cell_viscosity,c,t)

{

real shear_rate;

real mu;

real k;

real sqrt_gamma_ratio;

shear_rate = C_STRAIN_RATE_MAG(c,t);

sqrt_gamma_ratio = sqrt(shear_rate/gamma_c);

k = (k_0+k_inf*sqrt_gamma_ratio)/(1+sqrt_gamma_ratio);

if (y<50)

{

mu = mu_p/pow((1-0.5*k*H_ct),2);

else

mu=0.00345

}

mu=return mu;

}

[Karthik R]

Hello,

Were you able to compile this code? Did you get any errors? Could you please share your errors? One note: I do not think you have defined defined 'y' in your code.

As suggested by other experts, you should strongly consider looking into the DEFINE_PROFILE example in the customization manual. I am attaching a screenshot of the DEFINE_PROFILE here. Please go through similar examples for better understanding.

I hope this helps.

Best Regards,

Karthik

[Karthik R]

Hello,

Also one additional note:

please refrain from creating additional threads to ask follow-up questions related to an earlier thread because of the following reasons:

• there is no continuity and you might receive repetitive answers from different sources.


• If somebody has a similar issue as yours and is trying to find an answer, it becomes difficult to follow the discussion as it is scattered over several threads.

Thank you.

Best Regards,

Karthik

[DEBA]

SIR I HAVE WRITTEN UDF  BUT SIR I AM GETTING error sir 

ERROR IS fluent/14.0.0/src/dual_cell.h:line 1 : parse error.
 
 

[DrAmine]

Stop posting the same question everywhere please and bear in mind that this is an open community so everyone can have access into you UDF. 

[Rob]

Parse error typically means you've got the syntax wrong. If it's a UDF from the manual check for white space characters (HTML & pdf often contain these), if you wrote it check line 2 too.  I'm not entirely sure why you're trying to access the heat exchanger model, and would also recommend updating to R19.