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The air-water interface

The air-water interface

Water and air are two different fluids that enter into contact at the ocean's surface at what is called the air-water interface. This interface, also known as boundary surface or contact discontinuity, plays an important role in ship hydrostatics and in describing the...

What is the Froude number?

What is the Froude number?

The Froude number is used in naval architecture to: predict the boat-created wave system that moves along with the boat as it makes its way through the water;determine the resistance to boat progress generated by that wave system; infer the wave resistance of...

Sailing boat hydrodynamics

Sailing boat hydrodynamics

When a boat moves through the water, resistance forces are developed. These forces work to slow the boat down. If we think in terms of energy, a sailing boat gets the energy it requires to move forward from the energy created by the interaction between the sails and...

Frictional resistance

Frictional resistance

The frictional resistance is the most important component of the viscous resistance. It develops due to the direct friction between the water and the surface of the boat in contact with it (hull and appendages). It always acts in the opposite direction of the boat's...