K. Ebstrup, N. N. Sørensen, F. Bertagnolio, C. Grinderslev, S. G. Horcas
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引用次数: 0
摘要
使用不可压缩纳维-斯托克斯流求解器、改进型延迟分离涡模拟(IDDES)湍流模型和基于相关性的边界层过渡建模,对在极高雷诺数(Re = 8.0×106)条件下代表非锥形风力涡轮机塔有限段的两直径跨度挤压圆柱体上的涡诱力进行了数值研究。求解结果显示了跨度相关的结构性涡流脱落,斯特劳哈尔数 St = 0.48。边界层过渡发生在 θ 过渡 = 70 ◦,边界层分离发生在 θ 分离 = 120 ◦。网格相关性研究的结果强烈暗示,在使用 IDDES 时,随着网格的细化,斯特劳哈尔数会收敛到比以前文献报道的更高值,结果范围从使用 4.2 × 106 个单元的网格时的 St ∼ 0.44,到使用 33 × 106 个单元的最细网格时的 St = 0.48。URANS 没有出现这种情况,其最细网格的 St = 0.33。
Numerical investigation of vortex-induced forces on a wind turbine tower segment at very high Reynolds numbers
The vortex-induced forces on an extruded cylinder with a span of two diameters representative of a finite segment of a non-tapered wind turbine tower at a very high Reynolds number (Re = 8.0×106) are numerically investigated using an incompressible Navier-Stokes flow solver with an Improved Delayed Detached Eddy Simulation (IDDES) turbulence model and correlation-based boundary layer transition modelling. The solution shows spanwise correlated structured vortex shedding with the Strouhal number St = 0.48. The boundary layer transition is found to occur at θ transition = 70 ◦ , and boundary layer separation is found to occur at θ separation = 120 ◦ . Results from the grid dependency study strongly imply that when using IDDES, the Strouhal number converges to higher values than previously reported by the literature as the grid is refined, with results ranging from St ∼ 0.44 using a grid with 4.2 × 106 cells, to St = 0.48 for the finest considered grid with 33 × 106 cells. This behaviour is not seen for URANS, where St = 0.33 for the finest grid.