UDF编译正常，运行就出现问题，怎么办啊？？求大虾指点

弘毅

定义了新变量Tnorm=（T-Tmin）/（Tmax-Tmin）用了UDF在Fluent中运行（已启用能量方程）后出现：
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.
Error Object:（）
如题
附源程序：

#include "udf.h"
DEFINE_ON_DEMAND(on_demand_calc)
{
cell_t c;
Thread *t;
Domain *d=Get_Domain(1);
real tmax=0.,tmin=0.,temp;
thread_loop_c(t,d)
{
begin_c_loop(c,t)
{
temp=C_T(c,t);
if(temp<tmin||tmin==0.)tmin=temp;
if(temp>tmax||tmax==0.)tmax=temp;
}
end_c_loop(c,t)
}
thread_loop_c(c,d)
{
begin_c_loop(c,t)
{
temp=C_T(c,t);
C_UDMI(c,t,0)=(temp-tmin)/(tmax-tmin);
}
end_c_loop(c,t)
}
}