Fundamental Investigation on Estimation of Hydrodynamic Forces Acting on a Ship in Oblique Motion by Using Three Dimensional Vortex Method

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  • 三次元離散渦法を用いた斜航船体に作用する流体力の推定に関する基礎的検討
  • 3ジゲン リサンウズホウ オ モチイタ シャコウセンタイ ニ サヨウ スル リュウタイリョク ノ スイテイ ニ カンスル キソテキ ケントウ

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Abstract

In this paper, we focus on a three-dimensional vortex method as a useful calculation method to estimate the maneuverability of ships. The three-dimensional vortex method which does not need the grid generation as a pre-process is a Lagrangian method. The govering equations of the three-dimensional voretex method are vorticity transport equations and continuity equations.At first, we investigate effects of arbitrary parameters in the three-dimensional vortex method. we apply the three-dimensional vortex method to estimate the force acting on cylinder and sphere in various Reynolds number.Thereafter we calculate flow fields around a VLCC in oblique motion (β = 3°, 6°, 12°) and invesitgate usefulness of the three-dimensional vortex method.

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