Bank effect

Bank effect

Bank effect refers to the tendency of the stern of a ship to swing toward the near bank when operating in a river or constricted waterway.

The asymmetric flow around a ship induced by the vicinity of banks causes pressure differences (Bernoulli's principle) between port and starboard sides. As a result, a lateral force will act on the ship, mostly directed towards the closest bank, as well as a yawing moment pushing her bow towards the centre of the waterway. The squat increases due to the decreased blockage.

This phenomenon depends on many parameters, such as bank shape, water depth, ship-bank distance, ship properties, ship speed and propeller action. A reliable estimation of bank effects is important for determining the limiting conditions in which a ship can safely navigate a waterway.

This phenomenon has several different names, including bank suction, stern suction, and ship-bank interaction.

External links

* [http://www.bankeffects.ugent.be bank effects] : Information on the largest test program on bank effects.


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