# ps_12 - (a If the total drag on the model for the design...

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2 . 2 0 Problem Set 12 Name: ____________________ 1. Supplementary Problem Va25 2. Marine Hydrodynamics (JNN), Problem 3.7. Indicate whether quantities will increase or decrease and explain why. Assume a turbulent boundary layer. 3. The total resistance of a ship of length L = 200 m moving at a design speed of s U = 10 m/s is to be estimated using a model of length L = 2 m. The total wetted s m 2 surface area of the ship is S = 10 4 m . For this problem, assume that the properties of s the fluid in the towing tank and the ocean are the same and given by ρ = 1000 kg/m 3 and 6 2 ν = 10 m /s. Use g = 10 m/s 2 . Ignore any roughness corrections.
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Unformatted text preview: (a) If the total drag on the model for the design condition is D m = 10 N, find the total resistance D of the prototype ship at design speed. Use the ITTC friction line formula: s C = (log 075 . 0 R − ) 2 − 2 . f 10 (b) To understand the details of the flow, a pressure probe is mounted below the bow of the model. If the pressure measured has an amplitude of P m and a period of oscillation T (due probably to wave breaking at the bow), what will be the prototype values P s and m T at that point in terms of P m and T ? s m...
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