三次元離散渦法を用いた斜航船体周りの流場推定に関する研究

概要

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Present study applies a three-dimensional vortex method to estimate the flow field around a container ship in oblique motion. The three-dimensional vortex method which does not need the grid generation as a pre-process is a Lagrangian method. The governing equations of the three-dimensional vortex method are vorticity transport equations and continuity equations. In order to solve the convection and diffusion term of vorticity transport equations, present study uses the operatorsplit algorithm proposed by Chorin. A discreted vorticity model used in present study is votex blob which is a sphere type and has Gaussian distribution of vorticity. Core-spreading method which calculates the diffusion of voricity by changing the radius of vortex blob is used and 2nd order Adams-Bashforth method which calculates the convection of vorticity is used. Three-dimensional Hess and Smith type panel method is used to estimate the initial flow field. In present study, flow fields around a container ship in oblique motion (β=3°, 6°, 12°) are shown as results of calculation and usefulness of three-dimensional vortex method is investigated.
社団法人日本船舶海洋工学会の論文