Unsteady temperature profile
Hi, I am trying to define unsteady temperature profile in Fluent. The same profile has to be repeated everyday, where the temperature linearly increases from 300 K to 305 K for 1st 8 hours, then linearly decreases back to 300 K in the next 8 hours and then remains constant at 292 K for the last 8 hours. I am using the following code for the udf. But the result I am getting shows the temperature to increase continuously using the 1st profile (but it doesn't stop at 305 and just keeps increasing). Please help me out here. I had been struggling with this for days.
#include "udf.h" DEFINE_PROFILE(unsteady_temperature, thread, position) { face_t f; int n; real t = CURRENT_TIME; begin_f_loop(f, thread) { for (n=1; n<=31; n+=3) { if (CURRENT_TIME <= 3600*8*n) F_PROFILE(f, thread, position) = 300.0 + 5.0 * (t/8.0/3600.0); else if(CURRENT_TIME <= (3600*8*(n+1))) F_PROFILE(f, thread, position) = 305.0 - 5.0/8.0 * (t/3600.0-8.0); else F_PROFILE(f, thread, position) = 292.0 + 0.0 * t; } } end_f_loop(f, thread) } |
Obviously your solution through for cycle isn't working as you want. I think that much more easier solution is just to simply subtract number of days from current time and then use it in your "decision tree". So here is my approach:
PHP Code:
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Thank you very very much. It worked. I had done 2 days analysis by subtracting 24 hours in 2nd day profile. But didn't know how to extend it for longer period of time. Thanks a lot.
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