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Heat source UDF, please

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Old   December 20, 2006, 14:42
Default Heat source UDF, please
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Hi, guys. I need to write an UDF for volumetric heat production in a 3D problem. The heat source strength is a say parabollic function of say Z coordinate, e.g. q_dot=2*z*z-5z+3 W/m^3. Please help me. Thank you.
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Old   December 21, 2006, 06:01
Default Re: Heat source UDF, please
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#include "udf.h"

DEFINE_SOURCE(heat_source,c,t,dS,eqn) { real x[ND_ND]; real source;


source = 2*x[2]*x[2]-5*x[2]+3; dS[eqn] = 0.0;

return source; }

/*Z coordinate, e.g. q_dot=2*z*z-5z+3 W/m^3. Hook this UDF to appropriate panel for energy source. PS: I havent tested it for any error.*/

------- Sujith S Nair
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Old   December 21, 2006, 15:27
Default Re: Heat source UDF, please
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Thanks a lot.
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Old   May 5, 2012, 01:11
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I need to write an UDF for 2D heat source (on a face).The source has a parabolic function (source=x*x+2*x+1 ) Do I use C-CENTROID or C-FACE in my programm?
Please help me. Thank you.
real x[ND_ND];
real source;
cell_t c;
source = x*x+2*x+1;
dS[eqn] = 2*x+2;
return source;
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Old   October 14, 2014, 01:32
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i am facing the similar problem. my UDF of source term is showing zero output. here is my Udf , if anybody know the problem please help me .

real x[ND_ND];
real source,ve;
ve=sqrt((pow(C_U(c,t),2.0)+pow(C_V(c,t),2.0)+pow(C _W(c,t),2.0)));
source =-1.225*0.2*0.55* C_U(c,t)*ve;
return source;

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