绕流中平直与曲壁面周围局部压力的对比研究

A comparative study of local pressure in flow around straight and curved walls

水下结构物形状基本可分为平直壁面与曲壁面两类。为了探究这两类壁面在绕流中周围压力的分布情况,本文基于粘性流体理论,采用格子Boltzmann方法(LBM)分别建立了平直与曲壁面的二维钝体绕流模型。通过单柱绕流经典算例,验证了模型的正确性,得到了粘性流场中平直与曲壁面周围的压力分布情况,确定了钝体周围最大、最小压力点的位置及其历时变化规律,探究了雷诺数(Re)对壁面周围局部压力分布情况的影响。结果发现两者的最大压力点位置相同,但周期性变化不同,受结构的形状及锐利效应的影响,且两者的最小压力点位置不同。

The shape of underwater structures can be basically divided into two types:straight wall and curved wall.In order to investigate the distribution of the surrounding pressure in the flow around the two types of walls,based on the viscous fluid theory,the Lattice Boltzmann method(LBM)was used to establish the two dimensional models of the flow around blunt bodies with straight and curved walls respectively.The correctness of the models was verified by a classical example of flow around a single cylinder.The pressure distribution around the straight and curved walls in viscous flow field was obtained.The positions and the time-varying rules of the maximum and minimum pressure points around the blunt bodies were determined.The influence of Reynolds number(Re)on the local pressure distribution around the walls was investigated.The results showed that the positions of the maximum pressure points were the same for both straight and curved walls,but the periodic changes were different due to the influence of the shape of the structure and the sharp effect;the positions of the minimum pressure points were different.