11.6 Postprocessing for Sliding Meshes

Postprocessing for sliding mesh problems is the same as for other unsteady problems. You will read in the case and data file for the time of interest and display and report results as usual. For spatially-periodic problems, you may want to use periodic repeats (set in the Views panel, as described in Section  28.4) to display the geometry. Figure  11.6.1 shows the flow field for the rotor-stator example of Figure  11.2.4 at one instant in time, using 1 periodic repeat.

When displaying velocity vectors, note that absolute velocities (i.e., velocities in the inertial, or laboratory, reference frame) are displayed by default. You may also choose to display relative velocities by selecting Relative Velocity in the Vectors Of drop-down list in the Vectors panel. In this case, velocities relative to the translational/rotational velocity of the "reference zone'' (specified in the Reference Values panel) will be displayed. (The velocity of the reference zone is the velocity defined in the Fluid panel for that zone.)

Note that you cannot create zone surfaces for the intersection boundaries (i.e., the interior/periodic/external zones created from the intersection of the interface zones). You may instead create zone surfaces for the interface zones. Data displayed on these surfaces will be "one-sided''. That is, nodes on the interface zones will "see'' only the cells on one side of the grid interface, and slight discontinuities may appear when you plot contour lines across the interface. Note also that, for non-planar interface shapes in 3D, you may see small gaps in your plots of filled contours. These discontinuities and gaps are only graphical in nature. The solution does not have these discontinuities or gaps.

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. For more information on generating XY plots of circumferential averages, see Section  28.8.4.

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