Determine the velocity ratio for dynamic similarity, and the ratio of vortex shedding frequencies.

In some speed ranges, vortices are shed from the rear of bluff cylinders placed across a flow. The vortices alternately leave the top and bottom of the cylinder, as shown, causing an alternating force normal to the free stream velocity. The vortex shedding frequency, f is thought to depend on ?, d, V, and µ. Use dimensional analysis to develop a functional relationship for f . Vortex shedding occurs in standard air on two cylinders with a diameter ratio of 2. Determine the velocity ratio for dynamic similarity, and the ratio of vortex shedding frequencies.

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