[ebtedaei]

Hi All,
I want to write a source code of UDF for Viscosity function in mixture model:

y = 3.8 * 0.001003 * (1-(x/0.62))^(-1.55)

Please help me...

Thanks

[lsqiet]

#include "udf.h"

DEFINE_PROPERTY(viscosity,c,t)
{

real x[ND_ND];
real y,a;
C_CENTROID(x,c,t);
a = 1-x[0]/0.62;

y = 3.8*0.001003*pow(a,-1.55);

rerurn y;

}

[ebtedaei]

Thank you...

you mean is:
return y;

[ebtedaei]

At the function, the parameter "x" is equal to "volume fraction of particles" in Mixture model.

variation range of x : 20 - 30

How do I define it into the source code?

[ebtedaei]

please help me...

[ebtedaei]

Hi All,
I'm using a multi-phase model. I need to write the UDF function for an output variable (derived from two other input parameters of each phase).
But this variable does not exist in the inlet boundary conditions, so I can not add the udf function to its boundary conditions!!!

what should I do? Thank you for advising.

[MayTheFlowBeWithYou]

Maybe you could use a user defined scalar or user defined memory? Need more details to help you.

[ebtedaei]

I am using "mixture" multi-phase model and two fluids (Water and X) that Water Viscosity is constant but the X Viscosity is changed.

So Viscosity of the mixture phase is changed and I have to add a viscosity UDF to the inlet boundary conditions.

As mentioned above, this variable does not exist in the inlet boundary conditions, so I can not add the udf function to its boundary conditions!!!