A fluid-structure interaction framework is developed to study scuba fin propulsion using a flexible three- dimensional model. The plate with thickness is im- mersed in a turbulent flow at a Reynolds number of 60,000 and oscillated at a fixed frequency and maximum leading edge displacement. The 3D flow characteristics are presented including the vorticity generated by this type of motion. The plate thickness is varied and the results show a strong dependence of the thrust, lift and power coefficients on the plate thickness.
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