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By default, the velocity vector arrows are too far from the airfoil to observe the flow characteristics.  Select the Velocity Vector object to edit the settings with which the vectors are defined. Change Symbol distribution to Based on mesh and input 3 for At every Nth item. Press Evaluate to update the display.  Under Appearance, change the Symbol sizing to 0.2 to shorten the arrows, then zoom in to see the arrows near the airfoil. Press the Play button in the model window to see how these velocity vectors develop over time.

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