舰船尾流大涡模拟方法

Study of large eddy simulation for the ship wake

针对舰船尾流直接数值模拟方法(DNS)耗时长、存储空间大等缺点,利用三维大涡模拟方法(LES)建立舰船尾流场控制方程,结合实船的初始边界条件,对流场在3个方向的速度及压强分布进行大尺度数值模拟分析。结果表明,流场中存在对称面,各变量相对其呈对称分布;流向速度呈指数形式衰减;展向速度分布具有三角函数的周期性特点。该方法计算效率较高,占用空间较少。

Considering the direct numerical simulation（DNS） ＇s defect of costing time and storage too much for the calculation of ship wake, this paper builds a dominate equation for the ship＇s wake through the three-dimensions large eddy simulation（LES） method, combining the original and boundary conditions to study the speed and pressure distribution of the wake in three directions via large scale numerical simulation method, the result indicates that there is a symmetry surface and all variables symmetrize to it; the stream direction＇s speed attenuates submiting to the exponential function; the distribution of the orientational speed has the characteristic of periodicity and trigonometric. This method has the advantage of high efficiency and less storage.