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Fluid Mechanics: Drag and Pressure

The pressure field created as a fluid moves over an object can also cause drag. This drag is directly related to the speed of the fluid moving over the object; the faster the fluid is moving the greater the magnitude of drag. The orientation of the surface to the flow will also have an effect on the magnitude of drag; surfaces that are normal to the flow will convert all of the pressure acting on that surface into drag, while surfaces parallel to the flow will feel very little drag effect due to the pressure field. To calculate the pressure drag refer to equation 1.

Drag Coefficient equation due to pressure (1)

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