For most ships, frictional resistance is the major component of their calm water resistance. Wave resistance exceeds the frictional component only at Froude numbers above 0.3. The frictional resistance of ships results from their turbulent boundary layers, which are the topic of ongoing research efforts all over the world. This chapter provides only a short summary of turbulent boundary layer features. In contrast to viscous laminar flow, turbulent boundary layers feature two mechanisms for shear stress generation. They share the viscosity driven shear stress with laminar boundary layers, but also generate shear stress by dissipation of energy through turbulent eddies. Using Reynolds' decomposition of the flow speed, wall shear stress may be expressed as a sum of viscous and turbulent shear stress. William Froude's successful method of predicting full scale resistance from model tests requires an accurate method to calculate the frictional resistance for model and full scale vessel.
Frictional Resistance
Fundamentals of Ship Hydrodynamics ; 146-164
2019-05-06
19 pages
Article/Chapter (Book)
Electronic Resource
English
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