[Eugen Shabagin]

Hello everyone !

I want to implement a location-dependent internal heat generation in a transient thermal analysis. Just consider a cylinder where the heat generation is a function of the radius,angle and height. Does someone know how to do it ?

Thank you.

Best Regards
Eugen

[ComputerGuy]

Have you tried examining the example from the UDF manual?

To use this appropriately (rather, quickly), you'll just need to change your radius, angle, and height to x,y,z coordinates...

http://www.geom.uiuc.edu/docs/refere...as/node42.html

x coordinate is x[0]
y coordinate is x[1]
z coordinate is x[2]

You'll have to get your source term and its derivative converted to your equation, of course, but hopefully this helps!

ComputerGuy

/*******************************************************************/
/* UDF for specifying an x-momentum source term in a spatially     */
/* dependent porous media                                          */
/*******************************************************************/

#include "udf.h"

#define C2 100.0

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

  C_CENTROID(x,c,t);
  con = C2*0.5*C_R(c,t)*x[1];

  source = -con*fabs(C_U(c, t))*C_U(c,t);
  dS[eqn] = -2.*con*fabs(C_U(c,t));

  return source;
}