Large Eddy Simulation of clearings in forest and their effect on wind turbines
Licentiatavhandling, 2018

When the number of wind farms increases, the number of wind turbines placed in forested areas will also increase, this is because of the large forest areas in Sweden. When the wind turbines are placed in forested areas the fatigue loads increase drastically, so their maintenance costs increase making them less profitable. In this work clearings in forest are studied to be able to increase the electrical power generated by the wind turbines and decrease the fatigue loads to make them more profitable.
The approach in this work is to use Computational Fluid Dynamics (CFD) with the Large Eddy Simulation (LES) turbulence model coupled to an aero elastic solver that solves the dynamic response of the wind turbine.
Here Ryningsnäs in Sweden is investigated with a homogeneous forest, the current clearing and an extended clearing. The electrical generator power was highest for the current clearing. But the fatigue loads were both higher and lower than the homogeneous forest depending on which part of the wind turbine that was investigated. The extended clearing nearly always had the lowest fatigue loads but unfortunately also the lowest electrical generator power. Further optimization of the clearings and the wind turbine locations in relation to them is needed to find the sweet spot where the fatigue loads are lower and the electrical generator power is higher.

OpenFOAM

FAST

Wind turbine

SOWFA

forest clearing

CFD

ALM

LES

EA, Hörsalsvägen 11
Opponent: Stefan Ivanell, Uppsala universitet, Sverige

Författare

Johanna Matsfelt

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Strömningsmekanik och akustik

Utgivare

Chalmers tekniska högskola

EA, Hörsalsvägen 11

Opponent: Stefan Ivanell, Uppsala universitet, Sverige

Mer information

Senast uppdaterat

2018-05-25