247_add_Added Masses of Ship Structures.pdf - 236 5 Added Masses of Bodies Moving Close to a Free Surface Table 5.7 Added masses of a triangular

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236 5 Added Masses of Bodies Moving Close to a Free Surface Table 5.7 Added masses of a triangular cylinder in a rectangular channel b/a λ 220 /(ρaT ) λ 220 /(ρaT ) 1.05 2.2142 1.1412 1.10 2.1650 1.0299 1.20 2.0997 0.9212 1.30 2.0601 0.8646 1.50 2.0194 0.8048 2.00 1.9934 0.7480 2.50 1.9902 0.7292 Table 5.8 Added masses of a cylinder having cross-section in the shape of a Lewis shipframe in a channel of rectangular section b/a λ 220 /(ρaT ) λ 220 /(ρaT ) 1.5 2.5769 0.4987 2.0 2.4483 0.4113 2.5 2.4338 0.3871 3.0 2.4320 0.3790 4.0 2.4315 0.3750 5.0 2.4307 0.3742 motion that this assumption is not applicable and the curves (surfaces) of the discon- tinuity of the velocity are formed (curves BD and CD in Fig. 5.62 ). In this case one should consider the flow around a body under the following boundary conditions on the body surface: 1. On the part AB and AC of the body where the flow does not separate one im- poses the water-tightness condition ∂ϕ/∂n = 0. 2. On the part BC of the body where the flow has separated from the body surface and the fluid is stagnant one assumes the constancy of the pressure, i.e., ϕ = 0.

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