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-   -   problem with time-periodic boundary condition transient profiles (https://www.cfd-online.com/Forums/fluent/165386-problem-time-periodic-boundary-condition-transient-profiles.html)

Sipher January 15, 2016 23:47

problem with time-periodic boundary condition transient profiles
 
Hi everyone. I cannot understand how time-periodic transient profiles work at all...please give me some ideas if you know where I go wrong. Thanks.

here is a simplified version of my txt file:


((testing transient 5 1)
(time
0.100
0.200
0.300
0.400
0.500
)
(u
0.0197726511912733
0.0255230783190052
0.0308709912548985
0.0357320502172657
0.0400295934024144
)
)


After reading this profile in Fluent and setting up the right boundary condition I was expecting my velocity inlet to behave like this..
time 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0....
u u1 u2 u3 u4 u5 u1 u2 u3 u4 u5....

(u1 - u5 represent the values in the above profile)

however what I got was always something like this...
time 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0....
u u2 u3 u4 u1 u2 u3 u4 u1 u2 u3....

u5 does not show up at all, and the starting value is also wrong...How am I supposed to use the transient profiles? I'm so confused.....:confused:


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