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Old   April 12, 2003, 21:39
Default UDF about source term
  #1
tian
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hi,all, i want to add a constant value A to u equation source, the udf is low, it's right?

DEFINE_SOURCE(p1_source, c, t, dS, eqn)

{ real A; real source;

source += A; /* A- constant */

return source;

}

thanks.

tian
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Old   April 12, 2003, 23:50
Default Re: UDF about source term
  #2
Sebeci
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Hi It is right, but you should add dS[eqn]=0 and only it's need to wiite source=A on your code.(if A is constant (dS/du)=0)

I hope this help you

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Old   April 17, 2003, 00:34
Default Re: UDF about source term
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tian
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Hi, Sebeci, thank you. you said that if A is constant,dS/du =0, but in fact, in my u equation, add A to the U equation source, if the dS/du not equal 0, how to do?

tian
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Old   May 2, 2003, 09:17
Default Re: UDF about source term
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Senthil
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that derivative dS is the derivative of the source term w.r.t. the corresponding variable(in single/multi phase flow-both).. So if A is constant, then the derivative should be zero for any transport eqn.

bye
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