We studied the interactions between freak wave and bottom-mounted vertical cylinder. The freak
wave is generated through linear superposition method which satisfies the definition that the wave height is at
least two times the significant wave height. A numerical wave tank is developed based on FLUENT software in
which the finite volume method is used for the spatial discretization. Grid sensitivity is conducted in 2D model,
and then the freak wave is simulated in 3D model. The freak wave loads on the vertical cylinder are calculated
and compared with the results obtained through Morison equation. The numerical results present larger peak and
shallower trough compared with the prediction of Morison equation. Meanwhile, the free surface wave elevation
within a radius distance around the vertical cylinder is investigated. The lowest wave run-up around vertical
cylinder caused by freak wave is about 55% of the highest wave run-up, and the direction is about 45˚of the wave
propagation.
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