Capturing the development and interactions of wakes in tidal turbine arrays using a coupled BEM-DES model
Capturing the development and interactions of wakes in tidal turbine arrays using a coupled BEM-DES model
复制标题
DOI：
10.1016/j.oceaneng.2019.03.064
复制
发表时间：
2019-06
影响因子：
5
通讯作者：
D. Gajardo;C. Escauriaza;D. Ingram
中科院分区：
文献类型：
--
作者：
D. Gajardo;C. Escauriaza;D. Ingram
随着潮汐能和水动力能系统的发展，需要新的工具来定量评估涡轮机对环境的影响，并估计其性能。当安装成阵列时，涡轮机尾流相互作用，增加了流动的复杂性并改变了它们的性能。实验和数值方法已被用于分析多个涡轮机的流动，但目前尚不清楚哪种详细程度是必要的，以代表流体动力学和设备的细节。在数值方法中，湍流模型和涡轮机表示法的选择仍然存在问题，因为更现实但计算成本高的方法不一定会改善对这些流动的理解。在这项研究中，我们进行模拟的涡轮机阵列的尾迹和它们之间的相互作用，与实验和以前的模拟进行比较研究的流体动力学。我们提出了一种方法，耦合分离涡模拟（DES）与叶素动量（BEM），显示通过捕捉动态丰富的相干结构的流动，我们提高了平均量和涡轮机性能的描述。结果表明，对于下游涡轮机，有一个加速的尾流发展，增加了床剪切应力的时间变化，功率和推力系数。
As tidal and hydrokinetic energy systems develop, new tools are needed to assess quantitatively the effects of turbines on the environment and to estimate their performance. When installed in an array, turbine wakes interact, increasing the complexity of the flow and changing their performance. Experimental and numerical approaches have been employed to analyze flows with multiple turbines, but it is not yet clear which level of detail is necessary to represent the flow hydrodynamics and the details of the devices. In numerical approaches, questions remain on the selection of turbulence models and turbine representations, since more realistic but computationally expensive methodologies not necessarily produce an improvement on the understanding of these flows. In this investigation we perform simulations of turbine arrays to study the hydrodynamics of wakes and their interactions, comparing with experiments and previous simulations. We propose a methodology that couples detached-eddy simulations (DES) with Blade Element Momentum (BEM), showing that by capturing the dynamically-rich coherent structures of the flow, we improve the description of mean quantities and turbine performance. The results show that for downstream turbines, there is an accelerated wake development, increasing the temporal variability of the bed shear stress, and the power and thrust coefficients.