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A long submerged support leg of a bridge will experience vortex shedding when a river current flows past it These vortices can create damaging periodic forces so you want to do a scale model test in

 A long submerged support leg of a bridge will experience vortex shedding when a river current flows past it. These vortices can create damaging periodic forces so you want to do a scale model test in a water tunnel as part of the initial bridge design. A dimensional analysis on this phenomenon reveals the following Pi terms: where ω shedding frequency, V-fluid velocity, p-fluid density,μ fluid viscosity and D and H are as shown. For the specific bridge of interest the full scale values are D- 1 m, H -2 m, and V-1 m/s. The scale model test in the water tunnel will use a model with H 0.4 m. a). At what velocity should the wind tunnel test be conducted? b). If the frequency leg in the river? found in the wind tunnel test is 30 Hz, what would be the expected shedding frequency on the bridge 6. (3 pts.) A long submerged support leg of a bridge will experience vortex shedding when a river current flows past it. These vortices can create damaging periodic forces so you want to do a scale model test in a water tunnel as part of the initial bridge design. A dimensional analysis on this phenomenon reveals the following Pi terms: where ω shedding frequency, V-fluid velocity, p-fluid density,μ fluid viscosity and D and H are as shown. For the specific bridge of interest the full scale values are D- 1 m, H -2 m, and V-1 m/s. The scale model test in the water tunnel will use a model with H 0.4 m. a). At what velocity should the wind tunnel test be conducted? b). If the frequency leg in the river? found in the wind tunnel test is 30 Hz, what would be the expected shedding frequency on the bridge

Apr 27 2020 View more View Less

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