12 0 0 0 OA 楔型モデルまわりに発生する自由表面衝撃波の数値流体力学的構造解明
- 著者
- 金井 亮浩 宮田 秀明
- 出版者
- The Japan Society of Naval Architects and Ocean Engineers
- 雑誌
- 日本造船学会論文集 (ISSN:05148499)
- 巻号頁・発行日
- vol.1995, no.177, pp.147-159, 1995 (Released:2010-01-22)
- 参考文献数
- 16
The free surface shock wave (FSSW) generated by a wedge model is numerically studied. The numerical simulations performed by the finite difference method employing density function method show the systematic variation of the shock phenomenon due to the Froude number based on the draft as obtained by experiments. The typical nonlinear phenomena like wave breaking and abrupt changes of velocity vectors are successfully captured and the details of wave breaking induced by the FSSW are clarified. Wave breaking occurs to weaken the nonlinearity and shear vortex and longitudinal vortex are generated from the overturning point on the free surface. After the wave breaking a steep wave is reproduced due to the nonlinearity. This seems to be periodically repeated.
1 0 0 0 CFD航走シミュレーションによる帆走艇の設計法
- 著者
- 片岡 秀太郎 宮田 秀明 金井 亮浩
- 出版者
- 社団法人 日本船舶海洋工学会
- 雑誌
- 日本造船学会論文集 (ISSN:05148499)
- 巻号頁・発行日
- vol.182, pp.113-120, 1997-12
- 参考文献数
- 9
- 被引用文献数
- 3
A new technique for PPS (performance prediction simulation) to design sailing boats is developed. The performance of a sailing boat with 6 degrees of freedom is predicted. The boat sails in the simulation with automatic steering to get steady state and with automatic sail trimming to get better VMG (Velocity Made Good). With this technique the steady performance of sailing boats is predicted with sufficient accuracy on various conditions. This system is applied to the design procedure for a IACC (International America's Cup Class) sailing boat for which the steady sailing attitude plays an important role for the sailing performance.