[typhoon1010]

Hi Everyone,

I am trying to write UDF for porous media.

porosity is variable porosity in Y direction (2D).

This is UDF for variable porosity.

#include "udf.h"

DEFINE_PROFILE(porosity, t, i)

{
real x[ND_ND]; real y; cell_t c;

begin_c_loop(c,t)

{

C_CENTROID(x,c,t);

y=x[1];

F_PROFILE(c,t,i)=y+5; }

end_c_loop(c,t) }


In addition, viscous resistance, inertial resistance and interfacial area depend on this variable porosity.

This is interfacial area UDF code.

#include "udf.h"
#define Dp 0.008
real Area(cell_t c,Thread* t)
{ real area;
area = 6.0*(1-zeta)/Dp;// zeta is variable porosity.
return area;
}


My question How can I receive variable porosity values for interfacial area. Because in this code zeta is constant. I would like to variable porosity values.

[Prakhar]

One of the possible ways would be to convert your constant variables to field variables. But you will have to convert them throughout your code so that they match.

[typhoon1010]

Dear Prakhar,
thanks your reply.
How can I conver constant variables to field variables. Can you suggest me document.

[pakk]

Originally Posted by typhoon1010

Dear Prakhar,
thanks your reply.
How can I conver constant variables to field variables. Can you suggest me document.

Suggested document: Fluent manual. Look for "User Defined Memory".