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Select Velocity... under Contours of and select Mach Number. Set Levels to 30.

 
Click Display.

For 1D case, mach number is a function of x position. For 1D case, we are supposed to see vertical contour of mach numbers that are parallel to each other. 

For 2D case, we are seeing curving contour of mach number. The deviation from vertical indicate the 2D effect. 

Do note that 1D approximation is fairly accurate around the centerline of nozzle.

Mach Number Plot

As in the previous tutorials, we are going to plot the velocity along the centerline. However, this time, we are going to use the dimensionless Mach quantity.

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