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-   -   UDF for Permeability in Porous Media (https://www.cfd-online.com/Forums/fluent-udf/32873-udf-permeability-porous-media.html)

 solomon January 18, 2004 22:36

UDF for Permeability in Porous Media

What is the udf for permeability or viscous resistance in Fluent 6.1?

 Umesh January 18, 2004 23:41

Re: UDF for Permeability in Porous Media

#include "udf.h" #include "sg.h"

#define R1soil 8e13 /* Resistances */ #define R2soil 2e13

/* Define Resistences */

DEFINE_PROFILE(one_res, thread, np) { cell_t c; real x[ND_ND]; real y;

y =x[1];

if ((y<h1 && y>=h2) || (y<h3 && y>=h4) || (y<h5 && y>=h6 ) )

F_PROFILE(c,thread,np) = R1soil; else if ((y<h2 && y>=h3) || (y<h4 && y>=h5) || (y<h6))

 solomon January 20, 2004 02:53

Re: UDF for Permeability in Porous Media

What is the h's (h2,h3,h4,h5,h6) stand for?

Thank you

 Umesh January 20, 2004 05:24

Re: UDF for Permeability in Porous Media

THis is UDF for a Packed column.. h1..h2.are column heights..i.e. distance along height...the udf specifies resistances for two layers of packings..

hope this helps.. by -Umesh

 co2 January 20, 2004 15:49

Re: UDF for Permeability in Porous Media

is there some syntax error in the last 2-3 lines of the code given by Umesh?

 umesh January 20, 2004 23:38

Re: UDF for Permeability in Porous Media

hi the code is correct... but some symbols were not displyed... just refer to this one

--The Code-----------

#include "udf.h"

#include "sg.h"

#define R1soil 8e13 /* Resistances */

#define R2soil 2e13

#define h1 1.8

#define h2 0.3

/* Define Resistences */

DEFINE_PROFILE(one_res, thread, np) { cell_t c;

real x[ND_ND];

real y;

y =x[1];

if (y less than h1 and and y greater than= h2)

else if (y less than h2)