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UDF for Permeability in Porous Media

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Old   January 18, 2004, 22:36
Default UDF for Permeability in Porous Media
  #1
solomon
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What is the udf for permeability or viscous resistance in Fluent 6.1?
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Old   January 18, 2004, 23:41
Default Re: UDF for Permeability in Porous Media
  #2
Umesh
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#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;

begin_c_loop (c,thread)

{ C_CENTROID(x,c,thread);

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))

F_PROFILE(c,thread,np) = R1graval;

} end_c_loop (c,thread) }
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Old   January 20, 2004, 02:53
Default Re: UDF for Permeability in Porous Media
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solomon
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What is the h's (h2,h3,h4,h5,h6) stand for?

Thank you
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Old   January 20, 2004, 05:24
Default Re: UDF for Permeability in Porous Media
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Umesh
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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..

i had used it successfully

hope this helps.. by -Umesh
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Old   January 20, 2004, 15:49
Default Re: UDF for Permeability in Porous Media
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co2
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is there some syntax error in the last 2-3 lines of the code given by Umesh?
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Old   January 20, 2004, 23:38
Default Re: UDF for Permeability in Porous Media
  #6
umesh
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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;

begin_c_loop (c,thread)

{ C_CENTROID(x,c,thread);

y =x[1];

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

F_PROFILE(c,thread,np) = R1soil;

else if (y less than h2)

F_PROFILE(c,thread,np) = R1graval;

} end_c_loop (c,thread) }

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Old   August 9, 2012, 12:05
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  #7
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kaci fodil
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reynolds039 is on a distinguished road
hello
what is the viscous resistance in multiphase flow throw a porous medium for each phase
(oil-water) , give the udf for each of them please
reynolds039 is offline   Reply With Quote

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