A 0.55 m-diameter horizontal circular cylinder is located 35 m below the still water level at...

 

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A 0.55 m-diameter horizontal circular cylinder is located 35 m below the still water level at an offshore site where the water depth is 75.0 m (Figure Q1). Waves 5.5 m high with period 12.5 s pass over the cylinder, with direction of propagation perpendicular to the line of the cylinder. The seawater density is 1025 kg/m3. The drag and inertia coefficients depend on Keulegan-Carpenter Number and can be estimated using the graph in the Aide Memoire. Determine the magnitude and dirèction of the wave-induced force per metre length on the cylinder (i) under a wave crest, (ii) under a wave zero down-crossing, and (ii) midway between the wave crest and the zero down-crossing. (Keulegan-Carpenter Number is is maximum horizontal water particle velocity at the where max KC = Umax D. structural member, r is the wave period and D is cylinder diameter.) 35m Y.-- O Cylinder, 0.55m diam. 75m A 0.55 m-diameter horizontal circular cylinder is located 35 m below the still water level at an offshore site where the water depth is 75.0 m (Figure Q1). Waves 5.5 m high with period 12.5 s pass over the cylinder, with direction of propagation perpendicular to the line of the cylinder. The seawater density is 1025 kg/m3. The drag and inertia coefficients depend on Keulegan-Carpenter Number and can be estimated using the graph in the Aide Memoire. Determine the magnitude and dirèction of the wave-induced force per metre length on the cylinder (i) under a wave crest, (ii) under a wave zero down-crossing, and (ii) midway between the wave crest and the zero down-crossing. (Keulegan-Carpenter Number is is maximum horizontal water particle velocity at the where max KC = Umax D. structural member, r is the wave period and D is cylinder diameter.) 35m Y.-- O Cylinder, 0.55m diam. 75m

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