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View the resulting pressure and velocity fields as before. This time we also have a theoretical prediction for the velocity field we can check.
Select Filters, Data Analysis, Plot Over Line.
Drag the two end points around, or click “P” to place them where the mouse
pointer is. Make sure both values of 
is between 
and 
,
e.g. 
. Click Apply. The velocity field should be linear in
the steady state.