CAJ | 학술논문

文章在时域中采用直接边界元的方法计算模拟了以稳定航速运动的近水面潜体全非线性兴波现象.从格林定理出发,在边界面上布置Rankine源和偶极子,采用时间步进的方法计算模拟潜体近自由面运动的兴波现象.每个时步自由面上的势和节点位置采用全非线性拉格朗日自由面边界条件求解,重新生成自由面网格准备下一个时步计算的初始条件.文中给出了数值计算的结果并与试验和线性计算的结果相比,证实了该方法是可靠的,并可以利用该方法建立数值波浪水池.
문장재시역중채용직접변계원적방법계산모의료이은정항속운동적근수면잠체전비선성흥파현상.종격림정리출발,재변계면상포치Rankine원화우겁자,채용시간보진적방법계산모의잠체근자유면운동적흥파현상.매개시보자유면상적세화절점위치채용전비선성랍격랑일자유면변계조건구해,중신생성자유면망격준비하일개시보계산적초시조건.문중급출료수치계산적결과병여시험화선성계산적결과상비,증실료해방법시가고적,병가이이용해방법건립수치파랑수지.
Three-dimensional fully nonlinear wave generated by moving disturbances with steady for-ward speed is solved using direct boundary integral method in time domain. The method is based on Green's second theorem. Rankine Sources and dipoles are placed on boundary surfaces. Time-step-ping scheme is adopted to simtdate the wave generated by submerged body near free surface during its movement. The values of the potential and position of the free surface are updated by integrating the fully nonlinear Lagrangian free surface boundary conditions for every time. The grid regeneration scheme is developed to determine the approximate position of the free surface for the next time step.The numerical results are presented and compared with linear theory and experimental measure-ments.The comparisons show good agreements and reliable of the numerical model which could be used in development of 3-D numerical wave tank in future.