How to draw chart for pressure vs frequncy?

March 17, 2006, 03:51

Hi i want to relate pressure with efficiency in cfx post.I want to draw a chart relating pressure with frequency .I am doing transiet analysis.I have to get pressure at each frequency.In trasnsient analysis post the chart can be drawn only for time on x axis.I want frequncy instead of x frequency.How i can do this.Can anybody tell me that?Thanks in advance.

March 17, 2006, 04:31

How do you define frequency? You may create a variable in Post to get what you want.

March 17, 2006, 08:34

A Fourier Transform is needed to transform data in time domain into frequency domain. I believe Post does not have this capability right now. You probably need a separate FFT code to do it.

March 17, 2006, 09:34

It should be possible to write a small program for fft analysis and run it under command window.

If you have other software like Matlab, just export your data into a text or csv file.

March 17, 2006, 03:51	How to draw chart for pressure vs frequncy?	#1
ravish Guest Posts: n/a	Hi i want to relate pressure with efficiency in cfx post.I want to draw a chart relating pressure with frequency .I am doing transiet analysis.I have to get pressure at each frequency.In trasnsient analysis post the chart can be drawn only for time on x axis.I want frequncy instead of x frequency.How i can do this.Can anybody tell me that?Thanks in advance.

March 17, 2006, 04:31	Re: How to draw chart for pressure vs frequncy?	#2
TB Guest Posts: n/a	How do you define frequency? You may create a variable in Post to get what you want.

March 17, 2006, 08:34	Re: How to draw chart for pressure vs frequncy?	#3
longbow Guest Posts: n/a	A Fourier Transform is needed to transform data in time domain into frequency domain. I believe Post does not have this capability right now. You probably need a separate FFT code to do it.

March 17, 2006, 09:34	Re: How to draw chart for pressure vs frequncy?	#4
TB Guest Posts: n/a	It should be possible to write a small program for fft analysis and run it under command window. If you have other software like Matlab, just export your data into a text or csv file.

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