请问下面两种写法哪一个正确？

zhouzfu

我想给一个体加上相等的热量源项，q的单位为J/m3，请问下面两种写法哪一个正确？

/* 热量源项程序 */
/* q=m*W*Q0*exp(-m*time) */
#include "udf.h"
DEFINE_SOURCE(cell_Q_source,cell,thread,ds,eqn)
{
  real source,time,m,W,Q0;
  m=0.32;
  W=180 ;
  Q0=330000 ;
  time=CURRENT_TIME/86400;
  source=m*W*Q0*exp(-m*time);
  ds[eqn]=-m*m*W*Q0*exp(-m*time);
  return source;
}
  

#include "udf.h"
DEFINE_SOURCE(cell_Q_source,cell,thread,ds,eqn)
{
  real source,time,m,W,Q0;
  m=0.32;
  W=180 ;
  Q0=330000 ;
  time=CURRENT_TIME/86400;
  source=m*W*Q0*exp(-m*time);
  ds[eqn]=-m*m*W*Q0*exp(-m*time);
  begin_c_loop(c, c_thread)
  {
    return source;
  }
  end_c_loop(c, c_thread)
}
  

feich

it should be the former one
when you add a source term,fluent will call your function as it performs a global loop on cells.