11 段差隅切り形状による船舶居住区風抵抗低減効果の数値解析

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The present paper investigates a wind drag reduction mechanism generated by a square corner cut and a step shaped geometry in an accommodation house of ship. For this purpose, numerical simulations of turbulent flow around the simplified models of accommodation house are conducted by using Large-Eddy Simulations (LES). Comparing the drag reduction rates with wind tunnel measurements, the numerical results are validated. The numerical results show cavity flows in the square cut corner and the step, and they can reduce wind pressure acting on the front surface. The geometries also reduce separation regions around the accommodation house and enhance pressure recovery on the back surface. These results show a considerable contribution of the back pressure in the wind drag reduction. For more realistic condition, the interactions between the flows around a ship hull and an accommodation house are also investigated by LES with shiphull geometry. In the case at a yaw angle of 30deg., the wind separates from the side edge of the shiphull and it does not impinge onto lower level of the accommodation house. In this case, the step shape is comparatively effective in the wind drag reduction and the back pressure has more contribution than the case without shiphull.
社団法人日本船舶海洋工学会の論文