# Time step

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• Last Post 05 March 2019
• Topic Is Solved
abd fs posted this 05 March 2019

Dear all,

I have a doubt, I have his data as indicated below.

Time step: ∆t = 5e-5 s  Simulation time: 30 periods of the jet (T)  Number of time step / T: 200

I need the period T to simulated a periodic function in Fluent. What do you think, in both pictures?

Best regard

SER

abenhadj posted this 05 March 2019

How large is the period?

Best regards,

Amine

abd fs posted this 05 March 2019

Dear Amine,

The size of the period depends on the frequency which varies between 30 and 100

Best regards,

SER

abenhadj posted this 05 March 2019

So for 30 Hz you have 1/30=0.033 [s]. In order to solve that perior you will require at least 20 time steps á 0.016 [s].

Best regards,

Amine

abd fs posted this 05 March 2019

Dear Amine,

this is the function I have

Best regards,

SER

abenhadj posted this 05 March 2019

?? What do you want to do? What is now the question??

Best regards,

Amine

abd fs posted this 05 March 2019

Dear Amine,

Thank you very much for your help, I just sent the function so you only have a general idea, and if you want to add something

Best regards,

SER

abenhadj posted this 05 March 2019

What shall I do now with the function? Just calculate the period of time require for your frequency and then try to resolve that period. With next student release you will be able to output directly the frequency or the period. (2019R1)

Best regards,

Amine

abd fs posted this 05 March 2019

Thank you so  much

Best regards

SER

abenhadj posted this 05 March 2019