为了解决流固耦合问题中物体大幅度运动带来的困难,更精确地计算波形变化和物体的受力,用任意拉格朗日-欧拉方法导出了带自由表面的流固耦合运动计算模型。在计算过程中用动网格方法跟踪浮体的运动,并用自适应网格在自由表面附近进行加...为了解决流固耦合问题中物体大幅度运动带来的困难,更精确地计算波形变化和物体的受力,用任意拉格朗日-欧拉方法导出了带自由表面的流固耦合运动计算模型。在计算过程中用动网格方法跟踪浮体的运动,并用自适应网格在自由表面附近进行加密。计算了无粘流体、粘性流体中浮体的运动规律,并与理想弹簧-物体振动模型理论解进行了比较,同时计算了浮体在粘性流体中的侧倾振荡。结果表明,在无粘流体中浮体的垂直振荡与理论解符合得较好;在粘性流体中物体的运动为阻尼振动,与实际相符得较好。浮体在粘性流体中的侧倾振荡为阻尼运动,其侧倾角度随时间的增加而减小,在小角度时侧倾振荡与理论解接近。计算结果验证了计算程序的可靠性与精度,为ALE(arb itrary lagrang ian eu lerian)方法应用于流体-多浮体耦合运动分析奠定了基础。展开更多
In this paper,the effects of forward speed on the lateral vibration of a slender structure in an infinite fluid are considered.By equating the bending stress of the structure with the hydrodynamic force acting on it,t...In this paper,the effects of forward speed on the lateral vibration of a slender structure in an infinite fluid are considered.By equating the bending stress of the structure with the hydrodynamic force acting on it,the equation which governs the fluid-structure interaction of a slender structure both vibrating and moving in water is obtained.Numerical results show that the influence of forward speed on the vibration of a slender structure in water is significant.It behaves like damping,reducing both natural frequencies and responses significantly.展开更多
文摘为了解决流固耦合问题中物体大幅度运动带来的困难,更精确地计算波形变化和物体的受力,用任意拉格朗日-欧拉方法导出了带自由表面的流固耦合运动计算模型。在计算过程中用动网格方法跟踪浮体的运动,并用自适应网格在自由表面附近进行加密。计算了无粘流体、粘性流体中浮体的运动规律,并与理想弹簧-物体振动模型理论解进行了比较,同时计算了浮体在粘性流体中的侧倾振荡。结果表明,在无粘流体中浮体的垂直振荡与理论解符合得较好;在粘性流体中物体的运动为阻尼振动,与实际相符得较好。浮体在粘性流体中的侧倾振荡为阻尼运动,其侧倾角度随时间的增加而减小,在小角度时侧倾振荡与理论解接近。计算结果验证了计算程序的可靠性与精度,为ALE(arb itrary lagrang ian eu lerian)方法应用于流体-多浮体耦合运动分析奠定了基础。
基金Supported by the National Natural Science Foundation of China under Grant No.50921001"973" Project under Grant No.2010CB832700
文摘In this paper,the effects of forward speed on the lateral vibration of a slender structure in an infinite fluid are considered.By equating the bending stress of the structure with the hydrodynamic force acting on it,the equation which governs the fluid-structure interaction of a slender structure both vibrating and moving in water is obtained.Numerical results show that the influence of forward speed on the vibration of a slender structure in water is significant.It behaves like damping,reducing both natural frequencies and responses significantly.
