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udf define property on a wall surface

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Old   September 16, 2009, 17:09
Question udf define property on a wall surface
  #1
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beibei
Join Date: Aug 2009
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I need to define aborption coefficient as a function of position x on a wall surface (pipe). FLUENT didn't seen to render it even though it could interprete. What could it be wrong? Couldn't fluent render udf on a surface? Thanks!

Here's my code:

#include"udf.h"
DEFINE_PROPERTY(absorption_coefficient, c, t)
{
real abs_coeff;
real x[ND_ND];
C_CENTROID(x,c,t);
if (x[0] > 0 && x[0] < 0.2)
abs_coeff = 593.9187;
elseif (x[0] > 0 && x[0] < 0.2)
abs_coeff = 197.6521;
elseif (x[0] > 0 && x[0] < 0.2)
abs_coeff = 177.0521;
elseif (x[0] > 0 && x[0] < 0.2)
abs_coeff = 140.5854;
else
abs_coeff = 140.5854;
Message(
"Abs coefficient for this cell %e = %e", x[0],abs_coeff);
return abs_coeff;
}
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Old   November 27, 2011, 12:10
Default udf
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arash
Join Date: Jun 2011
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hi,

can i modelling asphaltene precipitation that exist in crude oil by uusing ceramic filter monolit by defult formolation in fluent?

i want to modelling separation of asphaltene from crude oil by 19-channel ceramic filter,but i think it is not define in FLUENT that precipitate asphaltene on surface of ceramic channel base on diffrences between pore size.

i must write UDF for this porpuse or not?

most of oil flow must pass through the membrane wall and most of asphaltene must form a gel-layer and precipitation on inner surface od channel.

please help me as soon as possible

thank you so much
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