Numerical simulations to the diurnal variation of wakes behind wind turbines
A micro-scale numerical model was used to study the wind distribution in the vicinity of a wind turbine. Numerical results show, that the wake behind the turbine strongly depends on the time of day with a moderate horizontal extension during neutral daytime conditions and an elongated wake during st...
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| Format: | Article |
| Language: | English |
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Borntraeger
2010-02-01
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| Series: | Meteorologische Zeitschrift |
| Online Access: | http://dx.doi.org/10.1127/0941-2948/2010/0418 |
| Summary: | A micro-scale numerical model was used to study the wind distribution in the vicinity of a wind turbine. Numerical results show, that the wake behind the turbine strongly depends on the time of day with a moderate horizontal extension during neutral daytime conditions and an elongated wake during stable thermal stratification. A downshift of the maximum velocity deficit with increasing turbine distances has been simulated for neutral conditions, while an upshift was found during night-time situations. Due to a strong wind shear in the lower planetary boundary layer at night, larger values for turbulence intensity have been calculated than for daytime conditions. These modifications of the wind may cause a reduction of the energy yield of a wind turbine located in the wake of up to 50 %. The results of the numerical simulations show an overall qualitatively good agreement with available observations. |
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| ISSN: | 0941-2948 |