基于时间步长自适应技术的海上浮基风电平台绕流数值模拟分析

Numerical Simulation and Analysis of Offshore Floating Wind Power Generation Platform Flow Field based on Adaptive Time Step Technique

圆柱绕流问题对于研究海上浮基风电平台在波浪和海流作用下的动力特性以及开发深海风能具有重要的理论和工程应用价值,很多不可压缩流体力学数值模拟方法都基于圆柱绕流的实验或计算结果进行验证。基于自适应时间步长理论及小雷诺数(Re=100)情况下,采用有限体积法,借助FLUENT软件中的用户自定义(UDF)功能,通过二次开发在FLUENT中实现圆柱绕流的数值模拟,并对计算结果与先前的研究结果作了比较,依此来验证时间步长自适应技术和精细边界层网格设计的合理性。计算结果表明了该方法能有效获得准确的流体动力学参数并提高数值模拟计算精度,为该领域的深入研究提供依据。

Flow around a circular cylinder is a typical problem that has significant theoretical and practical engineering values for the study of hydrodynamic characteristics of offshore floating wind power generation platform under the influence of waves and currents, as well as for the exploration of deep sea wind power; many numerical simulation methods of incompressible fluid mechanics are validated based on the experimental or computational results of flow around a circular cylinder. Based on adaptive time step method under small Reynolds number condition （Re=100） and by using the finite volume method, the numerical simulation of flow around a circular cylinder is realized through secondary development on the User Defined Function （UDF） in the FLUENT software. The computation results are compared with previous research outcomes to validate the rationality of adaptive time step technique and the design of the refined boundary layer mesh. The results show that this method can be used to obtain precise fluid dynamic parameters and can improve the accuracy of the numerical simulation, which provides some reference for further researches in this field.