33.20.6 Fourier Transform Dialog Box

The Fourier Transform dialog box allows you to analyze your time dependent data using the Fast Fourier Transform (FFT) algorithm. See Section  29.11 for details about the items below.

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 dialog box, 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, ANSYS 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 ANSYS 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 box so that you write the FFT data to a file.

Write FFT   opens the Select File dialog box (see Section  2.1.6) 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 dialog box, which allows you to customize the plot axes.

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