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Old   August 13, 2007, 18:45
Default FFT on FLUENT
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Hy everyone, I'm trying to use the FFT on Fluent, so I exported the velocity in a point of my flow field. But when I load the TXT file I get this error:

Error: xy-read-file: invalid title Error Object: 12.448884

Error: Error reading file. Error Object: "J:\monitor_ponto_6_V_2.txt"

Error: CAR: invalid argument [1]: wrong type [not a pair] Error Object: #f

As I can see I'm not exporting on the right way, does anyone did something similar??

Thanks in advance

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Old   August 18, 2007, 13:10
Default Re: FFT on FLUENT
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What is that u exactly wanted. As far as I know the fft in fluent is for acoustic analysis for transforming the spl data which is stored in a specified format.


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Old   August 18, 2007, 16:56
Default Re: FFT on FLUENT
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I want to calculate the turbulent spectrum in a von Karman street... so I have a specific point in the flow and from that I export the velocity history...

From this velocity history I want to calculate the turbulent spectrum... that is the FFT of the velocity.

Also, I would like to know if you have any idea of how the Welch method works... Do you know something about it??


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