CFD Simulations for Sensitivity Analysis of Different Parameters to the Wake Characteristics of Tidal Turbine
CFD Simulations for Sensitivity Analysis of Different Parameters to the Wake Characteristics of Tidal Turbine
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DOI：
10.4236/ojfd.2012.23006
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
M. Gebreslassie;G. Tabor;M. Belmont
中科院分区：
文献类型：
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作者：
M. Gebreslassie;G. Tabor;M. Belmont
采用一种新的基于计算流体力学(CFD)的浸没体力(IBF)模型，研究了宽度接近度和网格尺寸对动量反转升力(MRL)涡轮尾迹特性的敏感性。该模型已作为源项加入到为求解两相流体而开发的大涡模拟(LES)中。模拟使用的是开源CFD程序OpenFOAM。模拟结果表明，网格大小和宽度近似性对潮汐涡轮机的流动特性和计算成本有很大影响。精细的网格尺寸和较大的宽度会导致较长的计算时间。相比之下，较粗的网格尺寸和较小的宽度减少了计算时间，但对流动特征的描述较差。此外，区域壁面边界靠近涡轮的位置影响了自由面、气体和两相界面的流动特性。这些结果表明，仔细研究合适的网格尺寸和壁面边界与涡轮之间的间距对于减小这些参数对模拟结果的影响是很重要的。
This paper investigates the sensitivity of width proximity and mesh grid size to the wake characteristics of Momentum Reversal Lift (MRL) turbine using a new computational fluid dynamics (CFD) based Immersed Body Force (IBF) model. This model has been added as a source term into the large eddy simulation (LES), which is developed for solving two phase fluids. The open source CFD code OpenFOAM was used for the simulations. The simulation results showed that the grid size and width proximity have had massive impact on the flow characteristics and the computational cost of the tidal turbine. A fine grid size and large width inflicted longer computational time. In contrast, a coarse grid size and small width reduced the computational time but showed poor description of the flow features. In addition, a close proximity of the domain’s wall boundary to the turbine affected the free surface, the air body, and the flow characteristics at the interface between the two phases. These results showed that careful investigation of a suitable grid size and spacing between the wall boundary and the turbine is important to minimise the effect of these parameters on the simulation results.