Preprints
https://doi.org/10.5194/wes-2021-94
https://doi.org/10.5194/wes-2021-94

  01 Oct 2021

01 Oct 2021

Review status: this preprint is currently under review for the journal WES.

RANS modelling of a single wind turbine wake in the unstable surface layer

Mads Baungaard, Maarten Paul van der Laan, and Mark Kelly Mads Baungaard et al.
  • DTU Wind Energy, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark

Abstract. Unstable atmospheric conditions are often observed during the daytime over land and for significant periods offshore, and are hence relevant for wake studies. A simple k-ε RANS turbulence model for simulation of wind turbine wakes in the unstable surface layer is presented, which is based on Monin-Obukhov similarity theory (MOST). The turbulence model parametrizes buoyant production of turbulent kinetic energy (TKE) without the use of an active temperature equation, and flow balance is ensured throughout the domain by modifications of the turbulence transport equations. Large eddy simulations and experimental data from the literature are used for validation of the model.

Mads Baungaard et al.

Status: open (until 16 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Mads Baungaard et al.

Mads Baungaard et al.

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Short summary
A typical daytime atmosphere is modelled and used as input for a simulation of the flow around wind turbines. The flow directly behind the turbine is called the "wake" and it is very dependent on the atmospheric conditions. Therefore it is important to be able to simulate in various different atmospheric conditions, but at the same time it is desired to a have a simple model, so that the simulation can be executed fast; this is the purpose of the suggested model.