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3 - Components of Hull Resistance

Published online by Cambridge University Press:  07 September 2011

Anthony F. Molland ,
Stephen R. Turnock  and
Dominic A. Hudson
Anthony F. Molland
Affiliation:
University of Southampton
Stephen R. Turnock
Affiliation:
University of Southampton
Dominic A. Hudson
Affiliation:
University of Southampton
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Summary

Physical Components of Main Hull Resistance

An understanding of the components of ship resistance and their behaviour is important as they are used in scaling the resistance of one ship to that of another size or, more commonly, scaling resistance from tests at model size to full size. Such resistance estimates are subsequently used in estimating the required propulsive power.

Observation of a ship moving through water indicates two features of the flow, Figure 3.1, namely that there is a wave pattern moving with the hull and there is a region of turbulent flow building up along the length of the hull and extending as a wake behind the hull.

Both of these features of the flow absorb energy from the hull and, hence, constitute a resistance force on the hull. This resistance force is transmitted to the hull as a distribution of pressure and shear forces over the hull; the shear stress arises because of the viscous property of the water.

Type
Chapter
Information
Ship Resistance and Propulsion
Practical Estimation of Propulsive Power
 , pp. 12 - 68
Publisher: Cambridge University Press
Print publication year: 2011

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