lecture22 - Lecture 22- Marine Hydrodynamics Lecture 22 6.9...

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Unformatted text preview: Lecture 22- Marine Hydrodynamics Lecture 22 6.9 Wave Forces on a Body U P U = ωA U ωA Re = = ν ν UT AωT A K c = = = 2 π F A h C F = = f , , R e , , roughness , . . . ρgA 2 λ λ λ Wave Diffraction steepness parameter 1 2.20 - Marine Hydrodynamics, Spring 2005 2.20 6.9.1 Types of Forces 1. Viscous forces Form drag, viscous drag = f ( R e , K c , roughness , . . . ). • Form drag ( C D ) Associated primarily with flow separation- normal stresses. • Friction drag ( C F ) Associated with skin friction τ w , i.e., F ∼ τ w dS . body (wetted surface) b.l . τ ω U 2 ) 2. Inertial forces Froude-Krylov forces, diffraction forces, radiation forces. Forces arising from potential flow wave theory, F = ndS , where p = − ρ ( ∂φ 1 |∇ φ | 2 p ˆ + gy + ∂t 2 body (wetted surface) =0 , for linear theory, small amplitude waves For linear theory, the velocity potential φ and the pressure p can be decomposed to φ = φ I + φ D + φ R Incident wave Diffracted wave Radiated wave...
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This note was uploaded on 02/27/2012 for the course MECHANICAL 2.20 taught by Professor Dickk.p.yue during the Spring '05 term at MIT.

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lecture22 - Lecture 22- Marine Hydrodynamics Lecture 22 6.9...

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