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Eliminating inital transient in CFD-post FFT analysis |
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#1 |
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Join Date: Nov 2010
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Dear all,
I'm trying to extract the frequency of oscillating in vortex shedding simulation, and to exclude the irregular drag and lift force data in inital transient to get a better FFT result. The checkbox "Full range of input data" in Fast Fourier Transform, "General" tab of Chart seems allow a specified time range selection of data, but it doesn't show any effect on the FFT result when I change the value of "Min" and "Max". The explanation of this checkbox in ANSYS Help Document is so rough that I cannot find out why it doesn't work. Does any body know if there is something wrong with my operation? Or if I have a misunderstanding of the function of this checkbox? Thanks a lot pz21 Last edited by pz21; October 8, 2013 at 01:41. Reason: Image inserted |
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#2 |
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Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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I have never used that function so cannot help you much. It is a new feature and I am a very old person
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#3 | |
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Quote:
Thanks again for your kindly reply Glenn. ![]() |
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#4 |
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Glenn Horrocks
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Free FFT software: Octave, python+(numpy or scipy)
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#5 |
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Tags |
cfd-post, cfx, data range, fft |
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