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We will now define the dynamic pressure. Create another expression and name it Dynamic pressure. In Details of Dynamic pressure, enter the following and click on Apply.

0.5*13*(1m/s)^2

It is important to enter the appropriate units so the dynamic pressure has the correct unit. Recall both the density and the upstream velocity are set to 1.Image Removed

The skin friction coefficient is the wall shear stress divided by the dynamic pressure. Create another expression and name it Cf. Enter the following and click on Apply.Wall shear/Dynamic pressure

The skin friction coefficient is a dimensionless parameter. The value is 0.129533 at the point (0,0,0).

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