Simulation of wind farms in flat and complex terrain using CFD

Prospathopoulos, John and Cabezón Martínez, Daniel and Politis, Evangelos S. and Chaviaropoulos, P. K. and Rados, K. and Schepers, J.G. and Hansen, Kurt S. and Barthelmie, Rebecca J. (2010). Simulation of wind farms in flat and complex terrain using CFD. In: "The Science of making Torque from Wind (Torque 2010)", 28/06/2010 - 30/06/2010, Crete, Greece. pp..

Description

Title: Simulation of wind farms in flat and complex terrain using CFD
Author/s:
  • Prospathopoulos, John
  • Cabezón Martínez, Daniel
  • Politis, Evangelos S.
  • Chaviaropoulos, P. K.
  • Rados, K.
  • Schepers, J.G.
  • Hansen, Kurt S.
  • Barthelmie, Rebecca J.
Item Type: Presentation at Congress or Conference (Article)
Event Title: The Science of making Torque from Wind (Torque 2010)
Event Dates: 28/06/2010 - 30/06/2010
Event Location: Crete, Greece
Title of Book: The Science of making Torque from Wind (Torque 2010)
Date: 2010
Subjects:
Freetext Keywords: Wind turbine wakes, CFD modelling, complex terrain, induction factor, turbulence model correction
Faculty: E.T.S.I. Industriales (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Use of computational fluid dynamic (CFD) methods to predict the power production from wind entire wind farms in flat and complex terrain is presented in this paper. Two full 3D Navier–Stokes solvers for incompressible flow are employed that incorporate the k–ε and k–ω turbulence models respectively. The wind turbines (W/Ts) are modelled as momentum absorbers by means of their thrust coefficient using the actuator disk approach. The WT thrust is estimated using the wind speed one diameter upstream of the rotor at hub height. An alternative method that employs an induction-factor based concept is also tested. This method features the advantage of not utilizing the wind speed at a specific distance from the rotor disk, which is a doubtful approximation when a W/T is located in the wake of another and/or the terrain is complex. To account for the underestimation of the near wake deficit, a correction is introduced to the turbulence model. The turbulence time scale is bounded using the general “realizability” constraint for the turbulent velocities. Application is made on two wind farms, a five-machine one located in flat terrain and another 43-machine one located in complex terrain. In the flat terrain case, the combination of the induction factor method along with the turbulence correction provides satisfactory results. In the complex terrain case, there are some significant discrepancies with the measurements, which are discussed. In this case, the induction factor method does not provide satisfactory results.

More information

Item ID: 21050
DC Identifier: http://oa.upm.es/21050/
OAI Identifier: oai:oa.upm.es:21050
Deposited by: Memoria Investigacion
Deposited on: 15 Mar 2014 08:48
Last Modified: 21 Apr 2016 11:09
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