Details
| Original language | English |
|---|---|
| Pages (from-to) | 91-99 |
| Number of pages | 9 |
| Journal | Meteorologische Zeitschrift |
| Volume | 19 |
| Issue number | 1 |
| Publication status | Published - 1 Feb 2010 |
Abstract
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.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Atmospheric Science
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In: Meteorologische Zeitschrift, Vol. 19, No. 1, 01.02.2010, p. 91-99.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Numerical simulations to the diurnal variation of wakes behind wind turbines
AU - Gross, Günter
PY - 2010/2/1
Y1 - 2010/2/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77949458104&partnerID=8YFLogxK
U2 - 10.1127/0941-2948/2010/0418
DO - 10.1127/0941-2948/2010/0418
M3 - Article
AN - SCOPUS:77949458104
VL - 19
SP - 91
EP - 99
JO - Meteorologische Zeitschrift
JF - Meteorologische Zeitschrift
SN - 0941-2948
IS - 1
ER -