船の粘性流場の計算における物体適合座標系の利用

概要

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An attempt was made to apply the boundary-fitted coordinate system to near-wake flow calculations of ships. The grid generations for SSPA-720 hull and HSVA tanker model were carried out by solving the Poisson-type equation numerically. The computations could be rather easily performed within less than several seconds by HITAC M-200H. The boundary condition for the vorticity on the body is expected to be improved which are important in the computing scheme where the vorticity transport equation is invoked as a governing equation. The near wake flow calculation for a 2-dimensional elliptic cylinder, whose ratio of the major and minor axes is 0.125, was carried out on the boundary-fitted coordinate system and compared with the result obtained on the Cartesian coordinate system. Significant improvements could be observed in the velocity field in the proximity of the body, the boundary condition was more accurately satisfied. Slight changes in the boundary values of the vorticity on the hull made some significant differences in the near wake velocity field. Through the present pilot computations, it was concluded that the use of the boundary-fitted coordinate system could be highly recommended to the near wake flow calculation of ships.
社団法人日本船舶海洋工学会の論文
1985-03-22