In the first case (single phase case) liquid enters the tube and absorbs heat energy which is produced by the solid region. There is no phase change happening here. The following UDF is used to calculate the source term in single phase flow. The UDF works correctly.
#include "udf.h"
DEFINE_EXECUTE_AT_END(s_calculation)
{
Domain *d=Get_Domain(1);
int zone_id=6;
Thread *t = Lookup_Thread(d,zone_id);
cell_t c;
thread_loop_c(t,d)
{
begin_c_loop(c,t)
{
C_UDMI(c,t,0)=C_T(c,t)*0.25;
}
end_c_loop(c,t)
}
}
DEFINE_SOURCE(energy, c, t, dS, eqn)
{
real x[ND_ND];
real source;
source =1680000*C_UDMI(c,t,0);
dS[eqn] = 0;
return source;
}
In second case, liquid enters the tube and undergoes phase change due heat addition.
How to rewrite above UDF for this multiphase case.
Hi Manu Francis ,
it basically should work the same, as in single phase flow, since your are not interacting with any of the phases?
But why to you use Thread *t = Lookup_Thread(d,zone_id); and then doing a thread_loop_c(t,d) where you loop over all threads in the domain. That makes no sense at all, but it also should not really matter, if you did not activate the source term in the fluid cell zone.
Best regards
Christian
- Badges
- Science topic