Implicit rule for the application of the 2-parameters RANS turbulence models to solve flow problems around wind turbine rotor profiles
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Appropriate wind farm layout design depends on the accurate prediction of flow characteristics around turbine’s
rotor, especially as it affects downstream turbines. The complexities of the flow characteristics as a result of the
wake deficit affects prediction accuracy. Thus, the importance of selecting an appropriate turbulence model to
resolve the flow dynamics of the wake deficit cannot be overemphasized. There are several numerical turbulence
models and selecting one that converges to the flow characteristics is inevitable for accurate performance prediction.
Most practices usually based the choice of model on previous studies’ methodologies and results without
the essence of application. While selecting the best performing model is usually not straightforward, it is however
hinged on knowledge of the capabilities to resolve eddies. This is the focus of this study. Various studies were
analysed alongside their turbulence resolution techniques with special consideration given to the Reynolds-
Averaged Navier Stokes methodology and the two equation transport models of k-ε and k-ω turbulence
models. The study showcased and determined the rule of engagement for the application of the eddy viscosity
model of the type of the k-ε and k-ω turbulence models to resolve the closure problem associated with flow
analysis. The shortcomings of each model were analysed and the comparative advantage of each was showcased
alongside the combinatorial shear stress transport k-ω model.
Keywords
TJ Mechanical engineering and machinery