As a breakwater, a suspended fixed pontoon is expected to receive energy of the wave and to reduce the wave height at downstream as much as possible. However, in other applications like floating bridges, the structure is expected to allow the wave to pass with the lowest possible energy absorption. In the present study, a numerical investigation has been conducted to identify the effective types of floating pontoon with different rectangular and circular cross sections under regular waves at different Reynolds numbers. Volume of fluid scheme and finite volume methods have been applied for tracking the free surface and discretization of the governing equations, respectively. To implement these numerical schemes, a computer code was developed and validated, which computes the lift and drag as well as the transmission coefficient for each of the moored fixed structures.

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