【作者】 刘晨辉； 汪淳；

【Author】 Liu Chenhui;Wang Chun;School of Naval Architecture, Ocean and Civil Engineering,Shanghai Jiao Tong University;

【机构】 上海交通大学船舶海洋与建筑工程学院；

【摘要】 作为一种无网格的纯拉格朗日方法,光滑粒子流体动力学(Smoothed Particle Hydrodynamics,SPH)方法中开放边界条件(包括入口和出口)的处理比较复杂。基于一种设置特殊缓冲区来处理开放边界条件的算法,采用弱可压缩的SPH(WCSPH)方法,对低雷诺数下二维限制区域内的淹没水射流进行数值模拟。同时,使用粒子移位算法来抑制粒子空间分布的各向异性,以获得均匀的粒子分布提高计算的精度。对射流穿透深度、射流最大宽度、射流流动形态和流场速度和涡量分布等进行了比较和分析,并通过与其他研究者的欧拉方法和SPH方法数值结果进行比较,验证所用计算模型的可靠性和有效性。更多还原

【Abstract】 As a pure meshless Lagrangian method, the treatment of open boundary conditions(including inlet and oulet) in Smoothed Particle Hydrodynamics(SPH) method is relatively complex. Based on an algorithm which implements open boundary conditions by means of setting special buffer regions, the weakly compressible SPH(WCSPH) method is used to simulate the submerged water jet in a two-dimensional confined region at low Reynolds number. At the same time, particle shifting algorithm is used to suppress the anisotropy of particle spatial distribution in order to obtain uniform particle distribution and improve the accuracy of calculation. The jet penetration depth, maximum width of jet, flow configuration, velocity and vorticity distribution of the flow field are compared and analyzed. The reliability and validity of the computational model are verified by comparing the numerical results of Euler method and SPH method with those of other researchers.更多还原