Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism
Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism
复制标题
潮汐流涡轮机尾流预测验证和尾流恢复机制分析
DOI：
10.3390/jmse7100362
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发表时间：
2019
影响因子：
2.9
通讯作者：
A. Mason
中科院分区：
文献类型：
--
作者：
S. Salunkhe;Oumnia El Fajri;S. Bhushan;D. Thompson;D. O'Doherty;T. O’Doherty;A. Mason
本文研究了旋转叶片分辨非定常雷诺平均纳维-斯托克斯（URANS）和改进延迟分离涡模拟（IDDES）计算对潮汐流涡轮性能和中间尾迹特性的预测能力。Ansys/Fluent和OpenFOAM模拟使用由多达1100万个单元组成的混合单元、非结构化网格进行。推力、功率和中间尾流的预测结果在实验数据的10%以内比较合理。在尾流预测方面，OpenFOAM的性能优于Ansys/Fluent， IDDES的性能优于URANS。模拟的主要局限在于对尾迹向涡轮轴扩散的预测，而尾迹向轴扩散的预测又与对尖涡剪切层湍流的预测有关。剪切层包含各向异性湍流结构；因此，混合RANS/LES模型，如IDDES，比URANS更受欢迎。不幸的是，由于模拟的应力损耗问题，IDDES无法准确预测近尾流区域的已解湍流。
This paper documents the predictive capability of rotating blade-resolved unsteady Reynolds averaged Navier-Stokes (URANS) and Improved Delayed Detached Eddy Simulation (IDDES) computations for tidal stream turbine performance and intermediate wake characteristics. Ansys/Fluent and OpenFOAM simulations are performed using mixed-cell, unstructured grids consisting of up to 11 million cells. The thrust, power and intermediate wake predictions compare reasonably well within 10% of the experimental data. For the wake predictions, OpenFOAM performs better than Ansys/Fluent, and IDDES better than URANS when the resolved turbulence is triggered. The primary limitation of the simulations is under prediction of the wake diffusion towards the turbine axis, which in return is related to the prediction of turbulence in the tip-vortex shear layer. The shear-layer involves anisotropic turbulent structures; thus, hybrid RANS/LES models, such as IDDES, are preferred over URANS. Unfortunately, IDDES fails to accurately predict the resolved turbulence in the near-wake region due to the modeled stress depletion issue.
流体动力涡轮机基于物理的执行器盘模型
DOI：
10.2514/6.2018-3227
发表时间：
2018
期刊：
--
影响因子：
--
作者：
Bowman J
通讯作者：
Bowman J