A ship is towing a sonar array which approximates a submerged cylinder 2.5 ft in diameter and 30 ft long with its axis normal to the direction of tow. For seawater at 20°C

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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A ship is towing a sonar array which approximates a submerged cylinder 2.5 ft in diameter and 30 ft long with its axis normal to the direction of tow. For seawater at 20°C, take ρ ≈ 1.99 slug/ft3 and μ ≈ 2.23E−5 slug/ft·s.

If the tow speed is 12 kn (1 kn = 1.69 ft/s), estimate the horsepower required to tow this cylinder. Take CD = 0.31.

What will be the frequency of vortices shed from the cylinder? Take fD/U ≈ 0.24.

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