高雷诺数下近壁圆柱绕流数值模拟与分析

近壁圆柱绕流问题在海底悬跨管道的研究中具有重要的意义。在绕流阻力、升力以及海底土壤的耦合作用下，海底管道所发生的移位、悬跨等现象对于海底管道的安全运行构成了很大的威胁。正确预测各种绕流条件下管流之间的作用力是保证油气管道安全的首要任务。海底管道在极端海洋环境条件下的管、流相互作用为高雷诺数绕流问题，处于高雷诺数下的绕流模拟比处于低雷诺数下的绕流模拟要复杂很多，它需要更精细的网格以及合适的湍流模型。此文对处于悬跨状态下的海底管道进行数值研究，给出不同间隙比下海流绕流海底管道的流场结构形态，分析了间隙比对绕流阻力和绕流升力的影响，为进一步研究海底悬跨管道的受力和变形提供载荷边界数据。

Numerical Simulation of High Reynolds Number Flow around a Circular Cylinder near the Wall

The study on the problem of flow around circular cylinder is significance for study of seabed messenger pipes. In the ac- tion of drag, lift and the coupling between seabed and soil, phenomena such as displacement and spanning have great threat for the safe running of submarine pipelines. Correct prediction of the force between pipe and flow under various flow conditions is the most important task to ensure the safety of oil and gas pipeline. The interaction between large diameter pipeline and flow in extreme sea environment might cause high Reynolds number flows problem. Flow simulation at high Reynolds numbers are more complicated than that at low Reynolds. For flow simulation, it is necessary to use more fine mesh and suitable turbulence model. In this article, submarine pipeline in suspended has been simulated, and the flow field structure under different clearance ratio has been discussed. In addition, the influence of the clearance ratio on flow drag and flow lift has been analyzed, providing with load boundary data for further study of stress and deformation of free spanning submarine.