%0 Journal Article %1 klein2018advanced %A Klein, Levin %A Gude, Jonas %A Wenz, Florian %A Lutz, Thorsten %A Krämer, Ewald %D 2018 %I European Academy of Wind Energy (EAWE) %J Wind Energy Science %K dfg f2018 oa oafonds sent ubs_10006 ubs_20010 ubs_30091 ubs_40136 unibibliografie %N 2 %P 713-728 %R 10.5194/wes-3-713-2018 %T Advanced computational fluid dynamics (CFD)-multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines %V 3 %X The low-frequency emissions from a generic 5 MW wind turbine are investigated numerically. In order to regard airborne noise and structure-borne noise simultaneously, a process chain is developed. It considers fluid-structure coupling (FSC) of a computational fluid dynamics (CFD) solver and a multi-body simulations (MBSs) solver as well as a Ffowcs-Williams-Hawkings (FW-H) acoustic solver. The approach is applied to a generic 5 MW turbine to get more insight into the sources and mechanisms of low-frequency emissions from wind turbines. For this purpose simulations with increasing complexity in terms of considered components in the CFD model, degrees of freedom in the structural model and inflow in the CFD model are conducted. Consistent with the literature, it is found that aeroacoustic low-frequency emission is dominated by the blade-passing frequency harmonics. In the spectra of the tower base loads, which excite seismic emission, the structural eigenfrequencies become more prominent with increasing complexity of the model. The main source of low-frequency aeroacoustic emissions is the blade-tower interaction, and the contribution of the tower as an acoustic emitter is stronger than the contribution of the rotor. Aerodynamic tower loads also significantly contribute to the external excitation acting on the structure of the wind turbine.

@article{klein2018advanced, abstract = {The low-frequency emissions from a generic 5 MW wind turbine are investigated numerically. In order to regard airborne noise and structure-borne noise simultaneously, a process chain is developed. It considers fluid-structure coupling (FSC) of a computational fluid dynamics (CFD) solver and a multi-body simulations (MBSs) solver as well as a Ffowcs-Williams-Hawkings (FW-H) acoustic solver. The approach is applied to a generic 5 MW turbine to get more insight into the sources and mechanisms of low-frequency emissions from wind turbines. For this purpose simulations with increasing complexity in terms of considered components in the CFD model, degrees of freedom in the structural model and inflow in the CFD model are conducted. Consistent with the literature, it is found that aeroacoustic low-frequency emission is dominated by the blade-passing frequency harmonics. In the spectra of the tower base loads, which excite seismic emission, the structural eigenfrequencies become more prominent with increasing complexity of the model. The main source of low-frequency aeroacoustic emissions is the blade-tower interaction, and the contribution of the tower as an acoustic emitter is stronger than the contribution of the rotor. Aerodynamic tower loads also significantly contribute to the external excitation acting on the structure of the wind turbine.}, added-at = {2019-12-12T12:09:01.000+0100}, author = {Klein, Levin and Gude, Jonas and Wenz, Florian and Lutz, Thorsten and Krämer, Ewald}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/25a20c51a3bf74c3e7edaed308b35759b/unibiblio}, doi = {10.5194/wes-3-713-2018}, interhash = {763e5026b53faaff252145257b442e04}, intrahash = {5a20c51a3bf74c3e7edaed308b35759b}, issn = {2366-7443}, journal = {Wind Energy Science}, keywords = {dfg f2018 oa oafonds sent ubs_10006 ubs_20010 ubs_30091 ubs_40136 unibibliografie}, language = {eng}, number = 2, pages = {713-728}, publisher = {European Academy of Wind Energy (EAWE)}, timestamp = {2021-05-27T09:44:19.000+0200}, title = {Advanced computational fluid dynamics (CFD)-multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines}, volume = 3, year = 2018 }