UDF for time dependent stepwise heat flux profile
 

Hi

I study natural convection flow in enclosures. I wrote a UDF for sinusoidal temperature change with time at the boundary before. I want to write a UDF for a stepwise heat flux profile. The wall heat flux change with the frequency about a mean value. Maximum heat flux is 150W/m2, minimum heat flux is 50W/m2 and mean value is 100W/m2.

Please can you help me to write the UDF?

Thanks a lot.