A 2D Boundary Element Method (BEM) is developed to study the vertical water entry of a bow-flare ship section with constant roll angle into initially calm water surface. Fully nonlinear free surface conditions and exact body boundary conditions are satisfied. The numerical calculations are compared with two available experiments for two different models. One model has a narrow lower part and the other has a blunt bottom. For the former case, the effects of roll angle and drop height are investigated. For the latter case, non-viscous flow separation from the bottom surface is considered. A secondary impact can happen on the windward upper body surface. Air cavities can be formed on the windward side as a result of the reattachment of separated flow on the body surface.
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