浮式风机一体化模拟的计算参数设置影响研究

随着海上浮式风机的大型化发展,针对漂浮式风机的一体化耦合分析越来越重要。本文利用Simo-Riflex-Aerodyn 仿真工具建立OC4-Deepcwind 漂浮式风机一体化耦合模型,分析计算时间步长、初始截断时间、弹性结构单元离散数等计算参数对模拟结果的影响,包括浮式基础运动、系缆张力、叶片受力等。结果表明：当计算时间步长为0.005 s、0.01 s、0.02 s 时,浮式风机的响应结果差别较小,而计算消耗时间相差较大,0.01 s、0.02 s 的计算时间分别是0.005 s的70%、37%。相同工况下,不同参量响应达到稳定所需时间不同,纵荡需要的时间较长,最长达200 s;不同工况下,同一参量达到稳定所需时间也不相同,切出工况需要的时间最短,较额定工况快约60 s。结构单元离散数对塔柱受力影响较小,对叶片变形影响相对明显,当叶片离散数目减小时,响应值增大12%。实际中应根据具体工况选择合理的计算时间步长、初始截断时间和弹性结构单元离散数量。

Study on the Influence of Calculation Parameters Setting in Integrated Simulation of Offshore Floating Wind Turbine

With the large-scale development of offshore floating wind turbine, the integrated coupling analysis of floating wind turbine is becoming more and more important. The Simo-Riflex-Aerodyn simulation tool is used to establish an integrated coupled model of the OC4-Deepcwind floating wind turbine, and to analyze the effects of parameters such as time step, initial cut-off time and discrete number of elastic structural elements on the simulation results, including the floating foundation motion, mooring line force, blade force, etc. The results show that when the calculation time step is 0.005 s, 0.01s and 0.02 s, the difference in the response results of the floating wind turbine is small, but the calculation consumption time has a large difference, with 0.01 s and 0.02 s consuming 70% and 37% of the computational time required for 0.005 s. Under the same working condition, the time required for different parameter responses to reach stability differs, with surge requiring the longest time, reaching stability at a maximum of 200 s; Under different working conditions, the time required for the same parameter to reach stability is different, and the time required for cut-out is the shortest, which is faster than that of the rated condition by about 60 s. The discrete number of structural element has smaller influence on the force of tower column, butrelatively obvious influence on the deformation of blade. When the discrete number of blade decreases, the response value increases by 12%. In practice, reasonable calculation time step, initial cut-off time and discrete number of elastic structural elements are selected according to specific working conditions.