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@PHDTHESIS{Thnnien:814934,
author = {Thönnißen, Frederik},
othercontributors = {Schröder, Wolfgang and Stumpf, Eike},
title = {{D}evelopment of a hybrid vortex method for wind turbine
rotor aerodynamics; 1. {A}uflage},
volume = {19},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {Verlagsgruppe Mainz GmbH},
reportid = {RWTH-2021-02430},
isbn = {978-3-95886-403-0},
series = {Aachener Beiträge zur Strömungsmechanik},
pages = {xii, 130 Seiten : Illustrationen, Diagramme},
year = {2021},
note = {Dissertation, RWTH Aachen University, 2021},
abstract = {Current estimates assume that the share of wind energy in
the global energy mix will increase fivefold until 2050.
Although wind energy has left its early stages of
development and already is a well-established source of
electricity, additional research is needed to face future
engineering challenges that arise from the deployment
expansion of this technology. In the field of wind turbine
rotor aerodynamics, the current industrial load calculation
almost entirely relies on low-fidelity models, e.g. methods
that are based on the blade-element-momentum theory (BEMT).
Due to their low computational cost they provide a valuable
tool for the iterative design process. However, their
prediction performance strongly depends on the fidelity of
semiempiric submodels. Since computing-intensive high-order
methods are not applicable in industry to tackle the
uncertainty caused by the use of these models, a new
generation of tailor-made engineering tools which represent
a compromise between computing time and accuracy is needed.
Vortex panel methods are particular promising to close this
gap. To gain further insights on their potential to enhance
the aerodynamic load calculation of wind turbine rotors, a
three-dimensional vortex panel method was implemented, which
can be augmented with a vortex particle method. Based on
experimental and numerical findings for the flow over a
three-bladed rotor, the aerodynamic prediction performance
of the implemented vortex panel method is assessed for axial
and yawed inflow conditions of the rotor. For the axial
inflow of the rotor, it is demonstrated that the predictions
of the panel method are on a par with the findings of
BEMT-based approaches and Reynolds-averaged Navier–Stokes
(RANS) solvers, if the missing influence of the boundary
layer is taken into account by an estimation. At the same
time, the required computing time using the vortex panel
method is in the range of $O(10^0)$ to $O(10^1)$ hours on a
standard desktop computer, which is a fraction of the time
of higher-order methods using the same hardware setup.
Furthermore, it is demonstrated for yawed inflow conditions
of the rotor that the implemented method inherently captures
the three-dimensional character of the flow around the rotor
without the need for a semi-empiric inflow model. To
accelerate the implemented vortex method, the graphic
processing unit (GPU) of a modern consumer graphics card is
used. In addition, a novel pseudo-particle method is
presented which overcomes the n-body problem characteristics
of vortex methods. This combination allows to conduct
complex simulations on a standard desktop computer without
the need for a multi-core cluster. The findings of this
thesis show that vortex panel methods represent perfectly
tailored tools to close the gap between current low and
high-fidelity methods applied in the field of computational
aerodynamics. Therefore, they offer a huge potential to
enhance the industrial aerodynamic load calculation of wind
turbine rotors.},
cin = {415110},
ddc = {620},
cid = {$I:(DE-82)415110_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
url = {https://publications.rwth-aachen.de/record/814934},
}
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