摘要
水下物体在近壁运动过程当中会受到壁面的流体动力干扰作用,在流体动力计算中必须加以考虑。基于非结构动网格技术,采用有限体积法,在不同的Re数下,对圆柱近壁面过程进行二维数值仿真,得到了不同间隙比(e=h/Dc)下流体动力变化规律及速度场压力场的流场细节。仿真结果表明在间隙比(e=h/Dc)较大时,圆柱受壁面影响较小,受力大小与无界流场中圆柱绕流受力接近;在间隙比较小时,圆柱受壁面干扰作用较明显,并且在靠近壁面时其两侧涡结构会往上移动。仿真结果在远壁面时与试验值接近,并且与势流理论所得结论吻合,为进一步计算更加复杂的流体动力干扰提供快捷可信的方法。
Unsteady hydrodynamic interactions appear while the underwater objects approach to the plan wall, so it must be considered in the calculation of hydrodynamics. The finity volume method and dynamic unstructured method are used to simulate the 2 - D motion of a cylinder approaching to the plan wall of different Reynolds number in this paper. Meanwhile some rules of hydrodynamic and the field of velocity and press in different gap ratio are also achieved. The results of simulation show that when the gap ratio is big, the effect of the wall to the cylinder is not strong and the force to it is close to the cylinder in non - boundary flow, by contraries, the plane wall affects the cylinder strongly and the vortexes beside the cylinder move up. The results by this method are close to that by the experimentation and the potential flow theory, so it can provide a convenience and quick method for the simulations of more complex status.
出处
《计算机仿真》
CSCD
北大核心
2010年第3期335-339,共5页
Computer Simulation
基金
国家自然科学基金项目(10872173)
关键词
流体动力干扰
近壁面
动网格
非定常
相对运动
Hydrodynamic interaction
Near wall
Dynamic mesh
Unsteady
Relative motion
