Wake deviation of yawed wind turbine by Large-Eddy Simulation

F Houtin-Mongrolle , Pierre Bénard (1) , G. Lartigue (1) , Vincent Moureau (1) , L. Bricteux (2) , J. Reveillon (1)

1 CORIA - Complexe de recherche interprofessionnel en aérothermochimie
2 UCL - Université Catholique de Louvain = Catholic University of Louvain

Keywords: Large Eddy Simulation, yaw and wake interaction According to the current energetic and environmental challenges, maximizing the electric power generated in windfarms is a societal concern. New strategies such as involving wind turbine yaw angle seem relevant to reduce wake interaction and associated power losses [1]. Therefore, yawed turbine aerodynamics is modified and remains a challenging investigation topic. Since experimental data on actual windfarm scales are not affordable and given the constant growth of computational resources, high order numerical simulations tend to be a promising approach [2]. The goal of this study is to evaluate a highly resolved numerical model under yaw condition in a wind tunnel before applying it to actual windfarm. The blade modeling is performed using an Actuator Line Method [3] (ALM), coupled to the low Mach-number massively-parallel finite-volume Large-Eddy Simulation (LES) flow solver on unstructured meshes, called YALES2 [4] [5]. The Blind Test 5 experimental configuration led at NTNU [6], gathering numerous experimental data, is reproduced in this study. After the study of a yawed turbine wake interaction with downstream turbine the study of a single yawed turbine (+30 o and 0 o) will be presented. The computational domain of these cases will be the NTNU wind tunnel, involving a turbulence grid aiming to create a fully turbulent sheared inflow [6]. The grid will be modeled using multiple Actuator Lines (to mimic the turbine blades) with dedicated polars [7] [8]. Each computational case is performed on a unstructured mesh with around 150.10 6 tetrahedra. An instantaneous velocity field of the yawed turbine wake interaction is presented on Figure 1. Figure 1: Instantaneous streamwise velocity field of wake interaction between two turbines in the NTNU wind tunnel with unstructured mesh

Domaines: Modélisation et simulation; Mécanique des fluides [physics.class-ph]; Sciences de l'ingénieur [physics]

F Houtin-Mongrolle, Pierre Bénard, G. Lartigue, Vincent Moureau, L. Bricteux, et al.. Wake deviation of yawed wind turbine by Large-Eddy Simulation. 15th EAWE PhD Seminar on Wind Energy, Oct 2019, Nantes, France. pp.29 - 31. ⟨hal-02384204⟩