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initiate pressure step at inlet to do dynamic response

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Old   May 19, 2016, 15:40
Default initiate pressure step at inlet to do dynamic response
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I wanna analyze dynamic response of pressure measurement and get transfer function from Fluent. What i do is to initiate a total pressure step at pressure inlet when simulation becomes periodic and to see how long it takes to reach another periodic level. Then export data and use Matlab to post-process. Is this the correct method to initiate step response and then do fft or bode of the time domain?
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Old   May 20, 2016, 01:13
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Yes. More or less. Usually you do it with a stationary system, but if the periodic state is the equilibrium state then it makes sense.
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Old   May 20, 2016, 01:33
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Thank you. Because I have vortex shedding behind, it's a periodic convergence..
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