CFD modelling of wind farms in complex terrain

Prospathopoulos, John and Politis, Evangelos S. and Chaviaropoulos, P. K. and Rados, K. and Schepers, J.G. and Cabezón Martínez, Daniel and Hansen, Kurt S. and Barthelmie, Rebecca J. (2010). CFD modelling of wind farms in complex terrain. In: "European Wind Energy Conference & Exhibition (EWEC 2010)", 20/04/2010 - 23/04/2010, Warsaw, Poland. pp..


Title: CFD modelling of wind farms in complex terrain
  • Prospathopoulos, John
  • Politis, Evangelos S.
  • Chaviaropoulos, P. K.
  • Rados, K.
  • Schepers, J.G.
  • Cabezón Martínez, Daniel
  • Hansen, Kurt S.
  • Barthelmie, Rebecca J.
Item Type: Presentation at Congress or Conference (Article)
Event Title: European Wind Energy Conference & Exhibition (EWEC 2010)
Event Dates: 20/04/2010 - 23/04/2010
Event Location: Warsaw, Poland
Title of Book: European Wind Energy Conference & Exhibition (EWEC 2010)
Date: 2010
Freetext Keywords: Wind farm CFD modelling, wind turbine wakes, induction factor, k–ω turbulence model, Durbin’s correction
Faculty: E.T.S.I. Industriales (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Modelling of entire wind farms in flat and complex terrain using a full 3D Navier–Stokes solver for incompressible flow is presented in this paper. Numerical integration of the governing equations is performed using an implicit pressure correction scheme, where the wind turbines (W/Ts) are modelled as momentum absorbers through their thrust coefficient. The k–ω turbulence model, suitably modified for atmospheric flows, is employed for closure. A correction is introduced to account for the underestimation of the near wake deficit, in which the turbulence time scale is bounded using a general “realizability” constraint for the fluctuating velocities. The second modelling issue that is discussed in this paper is related to the determination of the reference wind speed for the thrust calculation of the machines. Dealing with large wind farms and wind farms in complex terrain, determining the reference wind speed is not obvious when a W/T operates in the wake of another WT and/or in complex terrain. Two alternatives are compared: using the wind speed value at hub height one diameter upstream of the W/T and adopting an induction factor-based concept to overcome the utilization of a wind speed at a certain distance upwind of the rotor. Application is made in two wind farms, a five-machine one located in flat terrain and a 43-machine one located in complex terrain.

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Item ID: 21052
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Deposited by: Memoria Investigacion
Deposited on: 15 Mar 2014 08:58
Last Modified: 21 Apr 2016 11:10
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