A5105407681- Wind and Air Flow Studies
- Wind Energy Research and Development
- Fluid Dynamics and Vibration Analysis
- Fluid Dynamics and Turbulent Flows
- Aerodynamics and Fluid Dynamics Research
- Computational Fluid Dynamics and Aerodynamics
- Turbomachinery Performance and Optimization
- Meteorological Phenomena and Simulations
- Vibration and Dynamic Analysis
- Aerodynamics and Acoustics in Jet Flows
- Icing and De-icing Technologies
- Advanced Numerical Methods in Computational Mathematics
- Plasma and Flow Control in Aerodynamics
- Lattice Boltzmann Simulation Studies
- Advanced Aircraft Design and Technologies
- Particle Dynamics in Fluid Flows
- Tribology and Lubrication Engineering
- Aeolian processes and effects
- Aerospace and Aviation Technology
- Radiative Heat Transfer Studies
- Aerospace Engineering and Control Systems
- Energy Load and Power Forecasting
- Fluid dynamics and aerodynamics studies
- Hydraulic and Pneumatic Systems
- Hydrology and Sediment Transport Processes
Technical University of Denmark
2015-2024
Danmarks Nationalbank
2024
Danish Energy Association
2017-2022
Roskilde University
2013
Centre for Sustainable Energy
1995-2010
United States Department of Energy
2010
Aalborg University
2006-2008
Nordic Laboratory for Luminescence Dating
1992-2007
Abstract This article describes the application of an incompressible Reynolds‐averaged Navier–Stokes solver to several upwind cases from NREL/NASA Ames wind tunnel tests. In connection with NREL blind code comparison present results showed overall best agreement experimental measurements. Based on this, it is great interest demonstrate quality that can be obtained in 3D CFD rotor computations. All six we have 0° yaw angle and 3° tip pitch angle. computations are performed as rotor‐only...
The application of an incompressible Reynolds Averaged Navier-Stokes solver to cases from the NREL/NASA Ames wind tunnel test is described. Six NREL PHASE-VI rotor in upwind configuration under zero yaw and degrees tip pitch are computed. Favorable comparison computed results with measurements form shaft torque, root moments, spanwise force distributions, pressure distributions shown. good agreement documents feasibility 3D CFD computations connection prediction performance new rotors....
Abstract An actuator disc CFD model of the flow through a wind turbine in diffuser is developed and validated. Further, it shown theoretically from 1D analysis that Betz limit can be exceeded by factor proportional to relative increase mass rotor induced diffuser. The theoretical result verified model. Copyright © 2000 John Wiley & Sons, Ltd.
ABSTRACT A simple model for including the influence of atmospheric boundary layer in connection with large eddy simulations wind turbine wakes is presented and validated by comparing computed results measurements as well direct numerical simulations. The based on an immersed type technique where volume forces are used to introduce shear turbulence. application wake studies demonstrated combining it actuator line method, predictions compared field measurements. Copyright © 2013 John Wiley...
Bolund measurements were used for a blind comparison of microscale flow models. Fifty-seven models ranging from numerical to physical used, including large-eddy simulation (LES) models, Reynolds-averaged Navier–Stokes (RANS) and linearized in addition wind-tunnel water-channel experiments. Many assumptions violated when simulating the around Bolund. As expected, these showed large errors. Expectations higher LES However, submitted results, all had difficulties applying specified boundary...
Abstract In this paper, 3D Navier–Stokes simulations of the unsteady flow over NREL Phase VI turbine are presented. The computations carried out using structured grid, incompressible, finite volume solver EllipSys3D, which has been extended to include use overset grids. Computations presented, firstly, on an isolated rotor, and secondly, downwind configuration turbine, includes modelling tower tunnel floor boundary. successfully captures interaction between rotor blades wake, in good...
Abstract An improved k ‐ ϵ turbulence model is developed and applied to a single wind turbine wake in neutral atmospheric boundary layer using Reynolds averaged Navier–Stokes solver. The proposed includes flow‐dependent C μ that sensitive high velocity gradients, e.g., at the edge of wake. modified compared with original eddy viscosity model, Large‐Eddy Simulations field measurements eight test cases. comparison shows deficits, predicted by are much closer ones calculated Simulation those...
Abstract When predicting the flow over airfoils and rotors, laminar‐turbulent transition process can be important for aerodynamic performance. Today, most widespread approach is to use fully turbulent computations, where transitional ignored entire boundary layer on wings or handled by turbulence model. The correlation based model has lately shown promising results, present paper describes effort of deriving two non‐public empirical correlations make complete. To verify it applied a flat...
ABSTRACT Wind turbine wake can be studied in computational fluid dynamics with the use of permeable body forces (e.g. actuator disc, line and surface). This paper presents a general flexible method to redistribute wind blade as domain. The take any kind shape discretization, determine intersectional elements grid size these proportionally forces. potentially reduce need for mesh refinement region surrounding rotor and, therefore, also cost large farm simulations. special case disc is...
The present investigation used numerical simulations to study the vortex induced vibrations (VIVs) of a 96 m long wind turbine blade. results this baseline shape were compared with four additional geometry variants featuring different tip extensions. extensions was generated through variation two design parameters: dihedral angle bending blade out rotor plane and sweep in plane. applied methods relied on fluid structure interaction (FSI) approach, coupling computational dynamics solver...
Abstract This article describes a method for extracting aerofoil characteristics from 3D computational fluid dynamics (CFD) rotor computations. Based on the knowledge of detailed flow in plane, average sectional axial induction is determined each wind speed. this, local angle attack when knowing rotational speed and blade twist angle. The characteristics, i.e. C l d , are then computed forces acting blade. extracted used standard element momentum (BEM) code, where no corrections made...
Abstract The wake behind a wind turbine model is investigated using Computational Fluid Dynamics (CFD), and results are compared with measurements. the three‐bladed test rotor (D = 4.5 m) used in Model Experiments Controlled Conditions (MEXICO) tunnel experiment. During MEXICO experiment, particle image velocimetry measurements of induction upstream downstream were performed for different operating conditions, giving unique dataset to verify theoretical models CFD models. present paper first...
Abstract The use of Large Eddy Simulation (LES) to predict wall‐bounded flows has presently been limited low Reynolds number flows. Since the computational grid points required resolve near‐wall turbulent structures increase rapidly with number, LES unattainable for at high numbers. To reduce cost traditional LES, a hybrid method is proposed in which eddies are modelled Reynolds‐averaged sense. Close walls, flow treated Navier–Stokes (RANS) equations (unsteady RANS), and this layer acts as...
The paper describes the DAN-AERO MW experiments carried out within a collaborative, three years research project between Riso DTU and industrial partners LM Glasfiber, Siemens Wind Power, Vestas Systems finally utility company DONG Energy. main objective of is to establish an experimental data base which can provide new insight into number fundamental aerodynamic aeroacoustic issues, important for design operation size turbines. most issue difference airfoil characteristics measured under...
Abstract The wake of the 5MW reference wind turbine designed by National Renewable Energy Laboratory (NREL) is simulated using computational fluid dynamics with a fully resolved rotor geometry, an actuator line method and disc method, respectively. Simulations are carried out prescribing both uniform turbulent inflows, properties predicted three models compared. In inflow, methods found to be in very close agreement but differ significantly from rotor, which characterized much higher...
Abstract This paper presents a newly developed high‐fidelity fluid–structure interaction simulation tool for geometrically resolved rotor simulations of wind turbines. The consists partitioned coupling between the structural part aero‐elastic solver HAWC2 and finite volume computational fluid dynamics (CFD) EllipSys3D. shows that implemented loose scheme, despite non‐conservative force transfer, maintains sufficient numerical stability second‐order time accuracy. use strong is found to be...
Abstract. The wind energy industry relies heavily on computational fluid dynamics (CFD) to analyze new turbine designs. To utilize CFD earlier in the design process, where lower-fidelity methods such as blade element momentum (BEM) are more common, requires development of tools. Tools that numerical optimization particularly valuable because they reduce reliance by trial and error. We present first comprehensive 3-D adjoint-based shape a modern 10 MW offshore turbine. problem is aligned with...
Abstract An aerodynamically shaped vortex generator has been proposed, manufactured and tested in a wind tunnel. The effect on the overall performance when applied thick airfoil is an increased lift to drag ratio compared with standard generators. Copyright © 2015 John Wiley & Sons, Ltd.
Abstract This study investigates how losses in energy production from wind turbines are influenced by leading edge roughness, rotor control and climates using computations. The performance of a NACA633-418 airfoil with five different damage types was predicted Computational Fluid Dynamics (CFD) bumps at the grooves into edge. Also, one type corresponding to repair an “overbite” investigated. These characteristics were used computations where three maximum tip speeds reflected that Annual...
The present investigation used numerical simulations to study the vibrations of a wind turbine blade in standstill. Such are presumed affect horizontal axis designs and can jeopardize structural integrity machine. applied methods relied on fluid–structure interaction (FSI) approach, coupling computational fluid dynamics (CFD) solver with multibody finite-element solver. A 96-m-long was studied for large parametric space, accounting variation both pitch inclination. inclination defined as...
Abstract. Within the framework of fourth phase International Energy Agency (IEA) Wind Task 29, a large comparison exercise between measurements and aeroelastic simulations has been carried out featuring three simulation cases in axial, sheared yawed inflow conditions. Results were obtained from more than 19 tools originating 12 institutes, ranging fidelity blade element momentum (BEM) to computational fluid dynamics (CFDs) compared state-of-the-art field 2 MW DanAero turbine. More 15...