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(Click) Plots > XY Plot > Set Up.. as shown in the figure below.

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In the Solution XY Plot window, click on New Surface > Line/Rake... as shown below.

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In the Line/Rake Surface window, under End Points choose (x0 (m), y0 (m), z0 (m)) = (0,0.03175,0) and (x1 (m), y1 (m), z1 (m)) = (0,0.03175,0.00635). Name the surface as midline_les under New Surface Name. Click Create. The line can be viewed using Graphics and Animations > Mesh > Set Up....

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Go back to Solution XY Plot window and select Unsteady Statistics... and Mean Y Velocity under Y Axis Function and under Plot Direction choose (X,Y,Z) = (0,0,1). Choose midline_les under Surfaces and click Plot. The figure below shows the contour plot of instantaneous axial velocity.

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To save the line plot, select Write to File in the Solution XY Plot window and click Write. Select a location and save the file as MeanYVel_LES.xy.

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