 | Englberger A. Response of the wind-turbine wake to a turbulent atmospheric boundary-layer flow: Diss. / Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen. - Köln: DLR, 2017. - xi, 117 p.: ill. - (Forschungsbericht; 2017-51). - Res. also Germ. - Bibliogr.: p.107-116. - ISSN 1434-8454
Шифр: (Pr 1120/2017-51) 02
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1 Introduction ............................................... 1
2 Applied Methods ........................................... 11
2.1 Numerical model EULAG ..................................... 11
2.2 Wind-turbine parameterization ............................. 13
2.2.1 Parameterization of the forces ..................... 13
2.2.2 Application of the forces .......................... 22
2.2.3 Validation of the wind-turbine parameterization .... 23
2.3 Turbulence Preserving Method .............................. 24
2.3.1 Precursor simulation ............................... 24
2.3.2 Turbulence preserving method ....................... 25
2.3.3 Validation of the turbulence preserving method ..... 26
2.4 Atmospheric boundary-layer simulations of the diurnal
cycle ..................................................... 26
2.4.1 External forcing ................................... 26
2.4.2 Setup of the diurnal cycle simulations ............. 27
2.4.3 Interface between atmospheric boundary-layer and
wind-turbine sirnulations .......................... 29
2.4.4 Atmospheric boundary-layer and wind-turbine
characteristics .................................... 31
2.4.5 Validation of the atmospheric boundary-layer
simulations of the diurnal cycle ................... 32
3 Impact of neutral boundary layer turbulence on wind-
turbine wakes ............................................. 37
3.1 Reference simulation B.1 .................................. 37
3.2 Impact of the perturbation amplitude ...................... 40
3.3 Impact of the wind-turbine parameterization ............... 42
3.4 Impact of the rotation of the disc ........................ 45
3.5 Impact of the SGS closure model ........................... 46
3.6 Summary ................................................... 48
4 Impact of the diurnal cycle of the atmospheric boundary
layer on wind-turbine wakes ............................... 49
4.1 Idealized atmospheric boundary-layer simulation ........... 49
4.2 Wind-turbine simulations .................................. 53
4.3 Heterogeneous surface ..................................... 65
4.4 Summary ................................................... 69
5 A numerically efficient parameterization of turbulent
wind-turbine flows for LES of different thermal
stratifications ........................................... 71
5.1 Different thermal stratifications ......................... 71
5.2 Stratification dependent turbulent inflow ................. 74
5.3 Numerical Experiments ..................................... 79
5.4 Results ................................................... 83
5.5 Summary ................................................... 95
6 Conclusion ................................................ 97
Acronyms ...................................................... 105
Bibliography .................................................. 107
Acknowledgement ............................................... 117
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