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[UDF]surface combustion and inert heating in DPM. Help me.

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Old   May 14, 2019, 02:52
Default [UDF]surface combustion and inert heating in DPM. Help me.
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hso
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Hello, I have a question about DPM.

I'm studing coal combustion.

And I use FLUENT UDF to apply another surface combustion model.

But, there is a problem in the process of conversion to inert heating after the end of surface combustion.

Here is my code:
(I wrote it briefly)

Code:
 
DEFINE_DPM_LAW(surface_comb,p,coupled)
{
/*initialize, variable declaration...*/
/* combustion model equation... */
 
     if(P_MASS(p) == Ash_Mass) P_CURRENT_LAW(p) = 1;
}
 
DEFINE_DPM_SOURCE(source,c,t,S,strength,p)
{
/*initialize, variable declaration...*/
      if(P_MASS(p) == Ash_Char_mass) P_CURRENT_LAW(p) = 8;
      if(P_CURRENT_LAW(p) == 8)
      {
            /*source equation*/
      }
}
That is, In DEFINE_DPM_LAW, CURRENT_LAW is set to 1 when the current mass equal to ash mass.

But, this method does not work properly.

An error also occurs with P_CURRENT_LAW_INDEX(p).

When DPM_SWITCH is used, the size of the coal become strange.

I do not know how to proceed with Inert Heating after Surface Combustion.

Please Help.

Thanks.
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