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28.8.4 XY Plots of Circumferential Averages

You can also generate a plot of circumferential averages in FLUENT. This allows you to find the average value of a quantity at several different radial or axial positions in your model. FLUENT computes the average of the quantity over a specified circumferential area, and then plots the average against the radial or axial coordinate.



Steps for Generating an XY Plot of Circumferential Averages


You can generate an XY plot of circumferential averages in the radial direction using the circum-avg-radial text command:

plot $\rightarrow$ circum-avg-radial

or you can use the circum-avg-axial text command to generate an average in the axial direction:

plot $\rightarrow$ circum-avg-axial

The steps for generating an XY plot of circumferential averages are as follows:

  

1.   Specify the variable to be averaged by typing its name when FLUENT prompts you for averages of. You can press <Enter> to see a list of available variables.

2.   Choose the surface on which to plot data by typing its name when FLUENT prompts you for on surface.

figure   

Use the Grid Display panel to see a list of surfaces on which you can plot data. (Pressing <Enter> will not show a list of available surfaces.)

3.   Specify the number of bands to be created. (The default number of bands is 5.)

FLUENT will create circumferential bands by isoclipping the specified surface into equal bands of radial or axial coordinate. An example of the iso-clips created is shown in Figure  28.8.8. (The radial or axial coordinate is derived from the rotation axis of the Reference Zone specified in the Reference Values panel.)

Figure 28.8.8: Iso-Clips Created For Circumferential Averaging
figure

FLUENT then computes the average of the variable for each band using the area-weighted average described in Section  29.5.1. Finally, it plots the average of the variable as a function of radial or axial coordinate. Figure  28.8.9 shows an example of an XY plot of circumferential averages using radial coordinates.

Figure 28.8.9: XY Plot of Circumferential Averages
figure

When the circumferential average plot is generated, FLUENT also creates a new surface called radial-bands or axial-bands, which contains the iso-clips described above (see Figure  28.8.8). You can use this surface to generate other XY plots. For more information on the creation and manipulation of surfaces, see Chapter  27.



Customizing the Appearance of the Plot


If you want to customize the appearance of the axes or curves in a circumferential average plot, you can save the plot data to a file (using the plot-to-file text command, as described below), read the file into FLUENT and plot it again (using the File XY Plot panel, as described in Section  28.8.3), and then use the Axes and Curves panels (as described in Sections  28.8.8 and 28.8.9) to modify the appearance of the plot.

To save the plot data to a file, first use the plot-to-file text command to specify the name of the file.

plot $\rightarrow$ file-set $\rightarrow$ plot-to-file

Then generate the circumferential average XY plot as described above. FLUENT will display the plot in the graphics window, and also save the plot data to the specified file.


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