Accessing previous time step temperature in UDF
I'm trying to access the temperature from the previous time step on a face. I think I need to define a UDS but I'm not sure how. At present I have a line in a DEFINE_PROFILE UDF that says:
face_temp = F_UDSI(f,t1,0);
When I try to compile this I get the message "F_T_M1: undeclared variable"
Do I need to 1) #INCLUDE something more than udf.h. 2) Define the UDS somewhere else. 3) Do something else?
Thanks in advance for your help, Sam
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