Question: A structure is built underwater on the ocean floor where a strong current of 5 m/sec is measured. Inertial forces and viscous forces are dominant.

A structure is built underwater on the ocean floor where a strong current of 5 m/sec is measured. Inertial forces and viscous forces are dominant. The structure is to be studied by a 1:25 model in a water tunnel using seawater that is the same density (p = 1,030 kg/m3) and temperature (4°C) as that measured in the ocean. What speed must the water tunnel provide in order to study the force load on the structure from the current? If the required water tunnel velocity is judged to be impractical, can the study be performed in a wind tunnel using air at 20°C? Determine the air speed in the wind tunnel.

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