4.7 Article

Large-eddy simulation and analytical modeling study of the wake of a wind turbine behind an abrupt rough-to-smooth surface roughness transition

Journal

PHYSICS OF FLUIDS
Volume 34, Issue 12, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0129022

Keywords

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Funding

  1. SERB Startup Research Grant [SRG/2020/000265]
  2. National Supercomputing Mission on Param-Brahma cluster at IISER Pune [DST/ NSM/R&D_HPC_Applications/2021/28]

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This study investigates the evolution of a wind turbine wake downstream of an abrupt change in surface roughness. The results show that the changed surface roughness affects turbulent statistics such as streamwise velocity, turbulence intensity, and shear stress.
The evolution of a wind turbine wake situated downstream of an abrupt change in surface roughness is investigated using large-eddy simulations (LES). The results are compared with the evolution of the wake of a turbine sited on a homogeneously rough surface, and with the flow over a surface undergoing an abrupt roughness transition without a turbine. The changed surface roughness affects the turbulent statistics such as streamwise velocity, turbulence intensity, and shear stress. Different velocity deficits can be constructed based on different definitions of background velocity. The usual definition, that is, the difference between the velocity upstream and downstream of a turbine, attains negative values over a significant portion of the turbine wake, rendering it difficult to model using the usual Gaussian radial shape-based framework. An alternative definition, that is, the difference between the velocity over a heterogeneous surface in the absence and in the presence of a turbine, has mostly positive values and is amenable to modeling. A new model accounting for streamwise and vertical variations of the background velocity profile is developed. The new model yields more accurate predictions of the LES results than the existing Gaussian wake-shape model, which is applicable only for turbines sited on homogeneously rough surfaces. Published under an exclusive license by AIP Publishing.

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