斜航状態の肥大船の船体にかかる流体力のCFD計算

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Flows around tanker models in oblique tow were computed using an NS solver called NICE, developed at SRI. The Baldwin-Lomax turbulence model was used. Two hull forms were used in computation, i,e., the SR221A hull form and the SR221B hull form. The two forms have the same fore half shape, while they are different in the stern half. The SR221A hull form has V-shape stern sections, and the SR221B hull form has U-shape stern sections. Computations were carried out in drift angles form zero to 18 degrees. Computed results were compared with measured results, both in distributions and integrated values. The measured wake patterns showed the existence of strong longitudinal vortices at the stern. Their intensity was greater with the SR221B hull form of U-shap stern sections. Although the computed wakes showed similar longitudinal vortices, their intensity was smaller than the measured ones. The difference is believed to be attributed to the Baldwin-Lomax turbulence model, which is known to give excessive eddy viscosity values in flows with strong three-dimensional effect such as longitudinal vortices. Integrated values such as surge force, sway force, and rotational moment were compared with measured results. They showed good agreement with measured values. The agreement was slightly better with the SR221A hull form. Thus, it has been shown that an NS solver is useful in estimating hydrodynamic forces acting on a ship hull in oblique tow, and that the turbulence model needs modification in order to increase accuracy.
独立行政法人海上技術安全研究所の論文
1996-07-10

斜航状態の肥大船の船体にかかる流体力のCFD計算

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