Evolution of eddy viscosity in the wake of a wind turbine
<p>The eddy viscosity hypothesis is a popular method in wind turbine wake modeling for estimating turbulent Reynolds stresses. We document the downstream evolution of eddy viscosity in the wake of a wind turbine from experimental and large-eddy-simulation data. Wake eddy viscosity is isolated...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2023-03-01
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| Series: | Wind Energy Science |
| Online Access: | https://wes.copernicus.org/articles/8/449/2023/wes-8-449-2023.pdf |
| _version_ | 1797856213682094080 |
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| author | R. Scott L. Martínez-Tossas J. Bossuyt N. Hamilton R. B. Cal |
| author_facet | R. Scott L. Martínez-Tossas J. Bossuyt N. Hamilton R. B. Cal |
| author_sort | R. Scott |
| collection | DOAJ |
| description | <p>The eddy viscosity hypothesis is a popular method in wind turbine wake modeling for estimating turbulent Reynolds stresses. We document the downstream evolution of eddy viscosity in the wake of a wind turbine from experimental and large-eddy-simulation data. Wake eddy viscosity is isolated from its surroundings by subtracting the inflow profile, and the driving forces are identified in each wake region. Eddy viscosity varies in response to changes in turbine geometry and nacelle misalignment with larger turbines generating stronger velocity gradients and shear stresses. We propose a model for eddy viscosity based on a Rayleigh distribution. Model parameters are obtained from scaling the eddy viscosity hypothesis and demonstrate satisfactory agreement with the reference data. The model is implemented in the curled wake formulation in the FLOw Redirection and Induction in Steady State (FLORIS) framework and assessed through comparisons with the previous formulation. Our approach produced more accurate flow field estimates with lower total error for the majority of cases.</p> |
| first_indexed | 2024-04-09T20:36:46Z |
| format | Article |
| id | doaj.art-67388e518c1b4f669456d4474aac9f6c |
| institution | Directory Open Access Journal |
| issn | 2366-7443 2366-7451 |
| language | English |
| last_indexed | 2024-04-09T20:36:46Z |
| publishDate | 2023-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Wind Energy Science |
| spelling | doaj.art-67388e518c1b4f669456d4474aac9f6c2023-03-30T07:37:19ZengCopernicus PublicationsWind Energy Science2366-74432366-74512023-03-01844946310.5194/wes-8-449-2023Evolution of eddy viscosity in the wake of a wind turbineR. Scott0L. Martínez-Tossas1J. Bossuyt2N. Hamilton3R. B. Cal4Department of Mechanical Engineering, Portland State University, Portland, Oregon, USANational Renewable Energy Lab, Golden, Colorado, USADepartment of Mechanical Engineering, Portland State University, Portland, Oregon, USANational Renewable Energy Lab, Golden, Colorado, USADepartment of Mechanical Engineering, Portland State University, Portland, Oregon, USA<p>The eddy viscosity hypothesis is a popular method in wind turbine wake modeling for estimating turbulent Reynolds stresses. We document the downstream evolution of eddy viscosity in the wake of a wind turbine from experimental and large-eddy-simulation data. Wake eddy viscosity is isolated from its surroundings by subtracting the inflow profile, and the driving forces are identified in each wake region. Eddy viscosity varies in response to changes in turbine geometry and nacelle misalignment with larger turbines generating stronger velocity gradients and shear stresses. We propose a model for eddy viscosity based on a Rayleigh distribution. Model parameters are obtained from scaling the eddy viscosity hypothesis and demonstrate satisfactory agreement with the reference data. The model is implemented in the curled wake formulation in the FLOw Redirection and Induction in Steady State (FLORIS) framework and assessed through comparisons with the previous formulation. Our approach produced more accurate flow field estimates with lower total error for the majority of cases.</p>https://wes.copernicus.org/articles/8/449/2023/wes-8-449-2023.pdf |
| spellingShingle | R. Scott L. Martínez-Tossas J. Bossuyt N. Hamilton R. B. Cal Evolution of eddy viscosity in the wake of a wind turbine Wind Energy Science |
| title | Evolution of eddy viscosity in the wake of a wind turbine |
| title_full | Evolution of eddy viscosity in the wake of a wind turbine |
| title_fullStr | Evolution of eddy viscosity in the wake of a wind turbine |
| title_full_unstemmed | Evolution of eddy viscosity in the wake of a wind turbine |
| title_short | Evolution of eddy viscosity in the wake of a wind turbine |
| title_sort | evolution of eddy viscosity in the wake of a wind turbine |
| url | https://wes.copernicus.org/articles/8/449/2023/wes-8-449-2023.pdf |
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