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32.8.4 Plot/FFT...

The Plot/FFT... menu item opens the Fourier Transform panel.



Fourier Transform Panel


The Fourier Transform panel allows you to analyze your time dependent data using the Fast Fourier Transform (FFT) algorithm. See Section  28.10 for details about the items below.

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Controls

Options   lets you write the FFT data to a file or display the FFT data in a graphics window.

Write FFT to File   allows you to write out the FFT data directly to a file. When selected, the Plot FFT... buttons becomes the Write FFT... button.

Process Options   contains options to analyze signal data.

Process Receiver   allows you to analyze receiver data stored in memory.

Process File Data   allows you to analyze signal data from an existing input file.

Y Axis Function   contains a list from which you can select the function for the $y$ axis.

X Axis Function   contains a list from which you can select the function for the $x$ axis.

Receiver   contains a list of receivers from which you can select when the Process Receiver option is enabled.

Plot/Modify Input Signal...   opens the Plot/Modify Input Signal panel, in which you can set additional options for vector displays.

Plot Title   lets you create a new title or edit the original title for the FFT plot. By default, FLUENT adds the string "Spectral Analysis of'' to the title originally applied to the input signal plot.

Y-axis Label   allows you to create a new $y$ axis label or edit the original $y$ axis label. By default, the Y-axis Label corresponds to the selection in the Y Axis Function drop-down list.

X-axis Label   allows you to create a new $x$ axis label or edit the original $x$ axis label. By default, the X-axis Label corresponds to the selection in the X Axis Function drop-down list.

Files   lists the loaded input signal data files.

Load Input File...   loads an input signal data file into FLUENT for FFT analysis. The input file is listed under Files.

Free File Data   removes data from FFT analysis once the input signal data file is selected in the Files list.

Plot FFT   displays the FFT data in a graphic window. If the Write FFT to File option is selected, then this button becomes the Write FFT button, which opens a file selection dialog so that you write the FFT data to a file.

Write FFT   opens the Select File dialog box in which you can specify a name and save the FFT data to a file. If the Write FFT to File option is selected, then the Plot FFT button changes to the Write FFT button.

Axes...   opens the Axes panel, which allows you to customize the plot axes.

Curves...   opens the Curves panel, which allows you to customize the curves used in the plot.



Plot/Modify Input Signal Panel


The Plot/Modify Input Signal panel allows you to customize the input signal data set. It is opened from the Fourier Transform panel. See Section  28.10.4 for details about the items below.

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Controls

Options   allows you to process some or all of the input signal data.

Clip to Range   allows you to analyze a portion of the input signal by specifying data range.

Subtract Mean Value   reduces y axis quantities by the mean value of the relevant signal property.

Signal Statistics   displays signal information.

Min   displays the minimum value for the input signal.

Max   displays the maximum value for the input signal.

Mean   displays the average value for the input signal.

Variance   displays the variance for the input signal.

X Axis Range   allows for a portion of the input signal to be analyzed when the Process the whole data option is turned off.

Min   specifies a minimum value for the $x$ axis.

Max   specifies a maximum value for the $x$ axis.

Set Defaults   resets the $x$ axis minimum and maximum values to their original value and turns on the Process the whole data option.

Signal Plot Title   lets you create a new title or edit the original title for the input signal plot. By default, the Signal Plot Title corresponds with the title originally applied to the input signal plot.

Y Axis Label   allows you to create a new $y$ axis label or edit the original $y$ axis label. By default, the Y-axis Label corresponds with the $y$ axis label originally applied to the input signal plot.

X Axis Label   allows you to create a new $x$ axis label or edit the original $x$ axis label. By default, the X-axis Label corresponds with the $x$ axis label originally applied to the input signal plot.

Window   lets you specify a windowing technique to remove discontinuities in the FFT calculation.

None   applies no windowing technique. This is the default setting.

Hamming   applies the Hamming technique.

Hanning   applies the Hanning technique.

Barlett   applies the Barlett technique.

Blackman   applies the Blackman technique.

Apply/Plot   applies any changes you have made in the panel and displays the input signal data in a graphics window.

Axes...   opens the Axes panel, which allows you to customize the plot axes.

Write...   opens the Select File dialog box, in which you can save the signals to a file.


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