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Fluid Mechanics: Froude Number

Froude number is used to determine the drag effects caused by the waves produced by ships. What Froude number does is it takes ratio of the free-stream speed to a typical wave speed on the interface of two fluids. Depending on how a ship or some other object moves through the water, different types of waves will be produced. If the drag effect on the waves is larger than say another set of waves produced by another ship, then the ship that produced the first set of waves is using more energy than the other ship since it takes energy to create the waves. Refer to the data below to view the difference between two different types of ship hulls.

Froude number's effects on drag coefficient

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