# FFT (Fast Fourier Transform) in fluent

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 March 3, 2014, 15:41 FFT (Fast Fourier Transform) in fluent #1 New Member   Puneet Join Date: Sep 2013 Posts: 13 Rep Power: 6 Hello everyone, I want to simulate motion of water in a rectangular tank. I have calculated forces in walls but now facing problem in plotting pressure variation at a certain point vs frequency using FFT. I am new to FFT and not able to get how to do it. plz help me Thanks.

 April 14, 2016, 06:16 #2 New Member   Hitesh Join Date: Sep 2015 Posts: 11 Rep Power: 4 Hello Every1.. I want to know that, what could be the best time interval to do the FFT in fluent ? as FFT (frequency spectrum)varies there with time interval size and sample no. I am little confuse with it...So please do help me with this..

 November 11, 2016, 06:52 #3 Senior Member   raunak jung pandey Join Date: Jun 2016 Posts: 100 Rep Power: 3 Hi can please someone help me for this ? I have data of FFT showing dominant frequency. But i need to find the exact frequency ? How to find the exact frequency with decimal points with the use of FFT ? I want to use FFT transformation to find the frequency in an oscillating device using CFD post. I created a point at the outlet and used FFT with x function- Frequency and Y function power spectral density. I get a big peak at a certain frequency and other minor frequencies. Is the highest peak the frequency of the device ? Thank You Last edited by wyldckat; November 20, 2016 at 12:55. Reason: merged posts from 2 threads on the same topic

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