FFT (Fast Fourier Transform) in fluent

puneetnema · March 3, 2014, 15:41

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.

hiteshlande · April 14, 2016, 07:16

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..

raunakjung · November 11, 2016, 06:52

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

March 3, 2014, 15:41	FFT (Fast Fourier Transform) in fluent	#1
puneetnema New Member Puneet Join Date: Sep 2013 Posts: 14 Rep Power: 13	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.

November 11, 2016, 06:52		#3
raunakjung Senior Member raunak jung pandey Join Date: Jun 2016 Posts: 102 Rep Power: 10	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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April 14, 2016, 07:16		#2
hiteshlande New Member Hitesh Join Date: Sep 2015 Posts: 11 Rep Power: 11	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..