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-   -   Fourier Transform (Spectral analysis) (http://www.cfd-online.com/Forums/fluent/34005-fourier-transform-spectral-analysis.html)

tayfun June 18, 2004 13:36

Fourier Transform (Spectral analysis)
 
Hello to all!

A short summary of my task: I am simulating a supersonic flow (M=1.5) through a rectangular channel over a cavity on the bottom of the channel with Fluent 6.1. The calculations are unsteady (time step 1x10e-6). In order to investigate the pressure oscillations on the top wall of the channel (opposite of the cavity) I define points at the top wall and write the pressures over time in a .OUT file.

Problem:

If I want to do a FFT analysis to plot the Pressure over the frequency I obtain untrue results. Is there a other way in fluent to present the pressure oscillations?

Thank you, for any response!


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