Wake meandering under non-neutral atmospheric stability conditions theory and facts. G.C. Larsen, E. Machefaux and A. Chougule
|
|
- Basil Potter
- 5 years ago
- Views:
Transcription
1 Wake meandering under non-neutral atmospheric stability conditions theory and facts G.C. Larsen, E. Machefaux and A. Chougule
2 Outline Introduction The DWM model Atmospheric stability DWM atmospheric stability conjecture Validation of conjecture analysis of full-scale velocity measurements analysis of full-scale wake deficit dynamics Generalization of DWM to non-neutral conditions Conclusions Future work Acknowledgements 2 DTU Wind Energy, Technical University of Denmark
3 Introduction Analyses of full-scale measurements from Danish (offshore) wind farms have shown a significant dependence of wake losses and wake driven loading on atm. stability conditions [e.g. Jensen, EWEC 2007; Hansen, Torque 2012; Hansen, Torque 2014] Horns Rev; 8m/s; 90 deg.; un-stable ctr. stable 3 DTU Wind Energy, Technical University of Denmark
4 The DWM model DWM is the poor man s LES core of the model is a split of scales large turb. scales responsible for meandering small turb. scales wake expansion/attenuation velocity deficit wake meandering Wind turbine wake wake induced turbulence Computational in-expensive preserving essential physics of non-stationary wake flows Suited for WT design and WF layout optimization 4 DTU Wind Energy, Technical University of Denmark
5 Atmospheric stability Mechanical friction is dictating turbulence production in the atmospheric boundary layer (ABL) under neutral conditions Buoyancy effects adds to friction when it comes to the turbulence production under ABL stability conditions different from neutral Buoyancy: Increased/decreased turbulence intensity for unstable/stable conditions Modify turbulence structure mainly the large scale regime 5 DTU Wind Energy, Technical University of Denmark
6 DWM atmospheric stability conjecture ABL stability impacts only the turbulent scales within the meandering regime [Larsen, Euromech 508, 2009] Burning questions: Does the DWM split in scales match the split between turbulence energy producing regime and the inertial subrange regime? Can a consistent kinematic model for turbulence modeling under non-neutral ABL be formulated? 6 DTU Wind Energy, Technical University of Denmark
7 Validation setup (1) Full-scale sonic measurements (16.5m a.g.l.) Homogeneous inflow conditions ensured by selecting data from only the (prevailing) wind direction sector (120 o o ) 1122 available 10-minute time series (4-10m/s) 7 DTU Wind Energy, Technical University of Denmark
8 Validation setup (2) Pulsed LiDAR mounted on the nacelle of a 500kW Nordtank turbine facilitating cross sectional scanning in a 7 7 Cartesian grid Time series ranging between 3 and 5 hours required for robustness of analysis 8 DTU Wind Energy, Technical University of Denmark
9 Validation approach Data binned with respect to mean wind speed and ALB stability Focus on lateral turbulence characteristics and lateral wake dynamics (i.e. wake deficit displacements) 7 ABL stability classes defined in terms of Monin- Obukhov length (L) [Peña, Royal Met. Soc., 2010] Very stable: 10 L < 50 Stable: 50 L < 200 Near neutral-stable: 200 L < L Neutral: Near neutral-unstable: -500 < L -200 Unstable: -200 < L -100 Very unstable: -100 < L DTU Wind Energy, Technical University of Denmark
10 Validation: full-scale velocity recordings (1) ABL stability affects turbulence level and turbulence structure De-trended lateral turbulence component... spectral inertial subrange regime hardly affected! 10 DTU Wind Energy, Technical University of Denmark
11 Validation: full-scale velocity recordings (2) Lateral turbulence variance normalized with neutral case bin wise 4 3,5 3 2,5 2 1, m/s 6-7m/s 7-8m/s 8-9m/s 9-10m/s 0, Turbulent energy increase relatively for unstable ABL conditions and decrease for stable. Most pronounced for low mean wind speeds 11 DTU Wind Energy, Technical University of Denmark
12 Validation: full-scale velocity recordings (3) Large scales: frequencies below the DWM frequency split f s = U/(2D) Large scale variance normalized with neutral case 4 3,5 3 2,5 2 1, m/s 6-7m/s 7-8m/s 8-9m/s 9-10m/s 0, Turbulent energy increase relatively for unstable ABL conditions and decrease for stable 12 DTU Wind Energy, Technical University of Denmark
13 Validation: full-scale velocity recordings (4) Small scale variance normalized with neutral case 4 3,5 3 2,5 2 1, m/s 6-7m/s 7-8m/s 8-9m/s 9-10m/s 0, Small scale turbulence energy level roughly invariant with respect stability conditions thus supporting the DWM stability conjecture 13 DTU Wind Energy, Technical University of Denmark
14 Validation: full-scale wake deficit dynamics (1) Three test cases associated with low wind conditions, and therefore pronounced deficits (i.e. high trust), are selected for this part of the analysis Focus on lateral wake deficit dynamics Wake deficit dynamics is obtained from instantaneous LiDAR cross sectional scans combined with a wake deficit tracking procedure 14 DTU Wind Energy, Technical University of Denmark
15 Validation: full-scale wake deficit dynamics (2) Resolved wake deficits expressed in meandering frame of reference almost invariant to the ABL stability conditions... thus confirming the DWM conjecture 15 DTU Wind Energy, Technical University of Denmark
16 Validation: full-scale wake deficit dynamics (3) Normalized variance of the lateral wake center position [6; 7]m/s 2 1,5 1 3D 4D 5D 0, Reasonable agreement between the range of large scale variance stability dependence ([6; 7]m/s) and the range of wake centre lateral dynamics variance stability dependence 16 DTU Wind Energy, Technical University of Denmark
17 Generalization of DWM to non-neutral conditions ABL stability impacts only the turbulent scales within the meandering regime Buoyancy consistent kinematic model used for turbulence modeling under non-neutral ABL conditions capturing the spectral stability cascade 17 DTU Wind Energy, Technical University of Denmark
18 Conclusions DWM split in scales roughly matches the split in scales between the turbulence energycontaining range and the turbulence inertial subrange confirming the DWM stability conjecture ABL stability impacts mainly the large meandering turbulence scales small scale turbulence regime can be considered invariant with respect to ABL stability conditions Generalized spectral tensor facilitates generalization of DWM to non-neutral stability conditions 18 DTU Wind Energy, Technical University of Denmark
19 Future work Improve/refine the fitting procedure for the generalized spectral tensor parameters ongoing 19 DTU Wind Energy, Technical University of Denmark
20 Acknowledgements The EUDP project Impact of atmospheric stability conditions on wind farm loading and production, under contract , is acknowledged for financial support and thus for making this study possible 20 DTU Wind Energy, Technical University of Denmark
21 DWM model 21 DTU Wind Energy, Technical University of Denmark 2015
Detecting wind turbine wakes with nacelle lidars
Detecting wind turbine wakes with nacelle lidars Dominique Philipp Held 1,2 Jakob Mann 1 Antoine Larvol 2 1 Department of Wind Energy, Technical University of Denmark (DTU) Frederiksborgvej 399 4000 Roskilde,
More informationSimulating the Vertical Structure of the Wind with the WRF Model
Simulating the Vertical Structure of the Wind with the WRF Model Andrea N Hahmann, Caroline Draxl, Alfredo Peña, Jake Badger, Xiaoli Lársen, and Joakim R. Nielsen Wind Energy Division Risø National Laboratory
More informationDetailed validation of dynamic loading simulation of offshore wind turbines operating in wake
Detailed validation of dynamic loading simulation of offshore wind turbines operating in wake Juan José Trujillo 1, Hauke Beck 1, Kolja Müller 2, Po Wen Cheng 2, Martin Kühn 1 1 - University of Oldenburg,
More informationWake modeling and simulation
Wake modeling and simulation Gunner C. Larsen, Helge Aa. Madsen, Torben J. Larsen, and Niels Troldborg Risø-R-1653(EN) 1 Risø National Laboratory for Sustainable Energy Technical University of Denmark
More informationA comparison study of the two-bladed partial pitch turbine during normal operation and an extreme gust conditions
Journal of Physics: Conference Series OPEN ACCESS A comparison study of the two-bladed partial pitch turbine during normal operation and an extreme gust conditions To cite this article: T Kim et al 2014
More informationCarbon Trust Offshore Wind Accelerator (OWA) Designing an Offshore Wind Measurement Campaign to Promote the Development of Wake Effects Models
Carbon Trust Offshore Wind Accelerator (OWA) Designing an Offshore Wind Measurement Campaign to Promote the Development of Wake Effects Models Brian Gribben and Breanne Gellatly 13 June 2012, London 1
More informationSCIENTIFIC REPORT. Host: Sven-Erik Gryning (DTU Wind Energy, Denmark) Applicant: Lucie Rottner (Météo-France, CNRM, France)
SCIENTIFIC REPORT ACTION: ES1303 TOPROF STSM: COST-STSM-ES1303-30536 TOPIC: Validation of real time turbulence estimation and measurement of wind gust using Doppler lidar. VENUE: Technical University of
More informationThe Forcing of Wind Turbine Rotors by True Weather Events as a Function of Atmospheric Stability State*
NAWEA 2015 Symposium 11 June 2015 Virginia Tech, Blacksburg, VA The Forcing of Wind Turbine Rotors by True Weather Events as a Function of Atmospheric Stability State* Balaji Jayaraman 1 and James G. Brasseur
More informationThe effect of wind farming on mesocale flow
The effect of wind farming on mesocale flow Validation and prediction A.J. Brand This report has been presented at: - the European Wind Energy Conference 2009, Marseille, France, 16-19 March 2009; - IEA
More informationA comparison study of the two-bladed partial pitch turbine during normal operation and an extreme gust conditions
Downloaded from orbit.dtu.dk on: Jul 12, 2018 A comparison study of the two-bladed partial pitch turbine during normal operation and an extreme gust conditions Kim, Taeseong; Pedersen, Mads Mølgaard; Larsen,
More informationReducing Uncertainty of Near-shore wind resource Estimates (RUNE) using wind lidars and mesoscale models
Downloaded from orbit.dtu.dk on: Dec 16, 2018 Reducing Uncertainty of Near-shore wind resource Estimates (RUNE) using wind lidars and mesoscale models Floors, Rogier Ralph; Vasiljevic, Nikola; Lea, Guillaume;
More informationExtreme Design Loads Calibration of Offshore Wind Turbine Blades through Real Time Measurements
Downloaded from orbit.dtu.dk on: Mar 08, 209 Extreme Design Loads Calibration of Offshore Wind Turbine Blades through Real Time Measurements Natarajan, Anand; Vesth, Allan; Lamata, Rebeca Rivera Published
More informationThree dimensional actuator disc modelling of wind farm wake interaction
Three dimensional actuator disc modelling of wind farm wake interaction S Ivanell 1,2, R Mikkelsen 3, J N Sørensen 3, D Henningson 1 1 Linné Flow Centre, KTH Mechanics, Stockholm, Sweden 2 Gotland University,
More informationJasna Bogunović Jakobsen a a
Jasna Bogunović Jakobsen a a University of Stavanger Etienne Cheynet a, Jonas Snæbjörnsson a,b, Torben Mikkelsen c, Mikael Sjöholm c, Nikolas Angelou c, Per Hansen c, Jakob Mann c, Benny Svardal d, Valerie
More informationPhysics of the Convective Boundary Layer based on Radar/Lidar Profiler measurements and simulation
Physics of the Convective Boundary Layer based on Radar/Lidar Profiler measurements and simulation D. Vanhoenacker Janvier (1), A. Graziani (1), D. Kovalev (1), C. Pereira (1), M. Duponcheel (2), R. Wilson
More informationarxiv: v1 [physics.flu-dyn] 23 Dec 2014
Copyright 204 American Institute of Physics. his article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. he following
More informationON ESTIMATION OF COHERENCE IN INFLOW TURBULENCE BASED ON FIELD MEASUREMENTS *
AIAA-004-100 ON ESTIMATION OF COHERENCE IN INFLOW TURBULENCE BASED ON FIELD MEASUREMENTS * Korn Saranyasoontorn 1 Lance Manuel 1 Paul S. Veers 1 Department of Civil Engineering, University of Texas at
More informationWake decay constant for the infinite wind turbine array Application of asymptotic speed deficit concept to existing engineering wake model
Downloaded from orbit.dtu.dk on: Jul 22, 208 Wake decay constant for the infinite wind turbine array Application of asymptotic speed deficit concept to existing engineering wake model Rathmann, Ole Steen;
More informationNumerical Simulations of Wakes of Wind Turbines Operating in Sheared and Turbulent Inflow
Numerical Simulations of Wakes of Wind Turbines Operating in Sheared and Turbulent Inflow Niels Troldborg, Jens N. Sørensen, Robert Mikkelsen Wind Energy Department, Risø National Laboratory, DK- Roskilde,
More informationSpectral tensor parameters for wind turbine load modeling from forested and agricultural landscapes
Downloaded from orbit.dtu.dk on: Aug 26, 2018 Spectral tensor parameters for wind turbine load modeling from forested and agricultural landscapes Chougule, Abhijit S.; Mann, Jakob; Segalini, A.; Dellwik,
More informationCanopy structure effects on the wind at a complex forested site
Journal of Physics: Conference Series OPEN ACCESS Canopy structure effects on the wind at a complex forested site To cite this article: L-É Boudreault et al 214 J. Phys.: Conf. Ser. 524 12112 View the
More informationThe Atmospheric Boundary Layer. The Surface Energy Balance (9.2)
The Atmospheric Boundary Layer Turbulence (9.1) The Surface Energy Balance (9.2) Vertical Structure (9.3) Evolution (9.4) Special Effects (9.5) The Boundary Layer in Context (9.6) Fair Weather over Land
More informationCOTUR Measuring coherence and turbulence with LIDARs
COTUR Measuring coherence and turbulence with LIDARs Yngve Heggelund, Martin Flügge, Jasna B. Jacobsen, Joachim Reuder, Etienne Cheynet, Benny Svardal, Tom Kjøde Science meets industry 2018-09-13 About
More informationPOD Analysis of a Wind Turbine Wake in a Turbulent Atmospheric Boundary Layer
Journal of Physics: Conference Series OPEN ACCESS POD Analysis of a Wind Turbine Wake in a Turbulent Atmospheric Boundary Layer To cite this article: D Bastine et al J. Phys.: Conf. Ser. 5 5 View the article
More informationWind fluctuations over the North Sea
INTERNATIONAL JOURNAL OF CLIMATOLOGY Int. J. Climatol. 31: 1584 1595 (2011) Published online 2 June 2010 in Wiley Online Library (wileyonlinelibrary.com) DOI: 10.1002/joc.2175 Wind fluctuations over the
More informationA comparative and quantitative assessment of South Africa's wind resource the WASA project
A comparative and quantitative assessment of South Africa's wind resource the WASA project Jens Carsten Hansen Wind Energy Division Risø DTU Chris Lennard Climate Systems Analysis Group University of Cape
More informationVALIDATION OF BOUNDARY-LAYER WINDS FROM WRF MESOSCALE FORECASTS WITH APPLICATIONS TO WIND ENERGY FORECASTING
VALIDATION OF BOUNDARY-LAYER WINDS FROM WRF MESOSCALE FORECASTS WITH APPLICATIONS TO WIND ENERGY FORECASTING Caroline Draxl, Andrea N. Hahmann, Alfredo Peña, Jesper N. Nissen, and Gregor Giebel Risø National
More informationWake modeling with the Actuator Disc concept
Available online at www.sciencedirect.com Energy Procedia 24 (212 ) 385 392 DeepWind, 19-2 January 212, Trondheim, Norway Wake modeling with the Actuator Disc concept G. Crasto a *, A.R. Gravdahl a, F.
More informationLinking mesocale modelling to site conditions
VindKraftNet Mesoscale Workshop 3 March 2010, Vestas Technology HQ, Århus, Denmark Linking mesocale modelling to site conditions Jake Badger, Andrea Hahmann, Xiaoli Guo Larsen, Claire Vincent, Caroline
More informationAeroacoustic calculations of a full scale Nordtank 500kW wind turbine
Journal of Physics: Conference Series PAPER OPEN ACCESS Aeroacoustic calculations of a full scale Nordtank 500kW wind turbine To cite this article: H Debertshäuser et al 2016 J. Phys.: Conf. Ser. 753 022032
More informationInfluence of Atmospheric Stability on Wind-Turbine Wakes: A Large-Eddy Simulation Study
Influence of Atmospheric Stability on Wind-Turbine Wakes: A Large-Eddy Simulation Study Mahdi Abkar, a), b) and Fernando Porté-Agel École Polytechnique Fédérale de Lausanne (EPFL), Wind Engineering and
More informationACTION: STSM: TOPIC: VENUE: PERIOD:
SCIENTIFIC REPORT ACTION: ES1303 TOPROF STSM: COST-STSM-ES1303-TOPROF TOPIC: Measurement of wind gusts using Doppler lidar VENUE: Technical University of Denmark, Risø, Roskilde, Denmark PERIOD: 7 11 December,
More informationLogarithmic velocity profile in the atmospheric (rough wall) boundary layer
Logarithmic velocity profile in the atmospheric (rough wall) boundary layer P =< u w > U z = u 2 U z ~ ε = u 3 /kz Mean velocity profile in the Atmospheric Boundary layer Experimentally it was found that
More informationValidation of Boundary Layer Winds from WRF Mesoscale Forecasts over Denmark
Downloaded from orbit.dtu.dk on: Dec 14, 2018 Validation of Boundary Layer Winds from WRF Mesoscale Forecasts over Denmark Hahmann, Andrea N.; Pena Diaz, Alfredo Published in: EWEC 2010 Proceedings online
More informationAtmospheric stability-dependent infinite wind-farm models and the wake-decay coefficient
Downloaded from orbit.dtu.dk on: Sep 0, 208 Atmospheric stability-dependent infinite wind-farm models and the wake-decay coefficient Pena Diaz, Alfredo; Rathmann, Ole Steen Published in: Wind Energy Link
More informationarxiv: v1 [physics.flu-dyn] 1 Feb 2017
An analytical model for a full wind turbine wake arxiv:1702.00166v1 [physics.flu-dyn] 1 Feb 2017 Aidan Keane, Pablo E. Olmos Aguirre, Hannah Ferchland, Peter Clive, Daniel Gallacher SgurrEnergy Ltd, 225
More informationUNCERTAINTY QUANTIFICATION WITH DEPENDENT INPUTS: WIND AND WAVES
6th European Conference on Computational Mechanics (ECCM 6) 7th European Conference on Computational Fluid Dynamics (ECFD 7) 11 15 June 2018, Glasgow, UK UNCERTAINTY QUANTIFICATION WITH DEPENDENT INPUTS:
More informationData-driven Reduced Order Model for prediction of wind turbine wakes
Journal of Physics: Conference Series PAPER OPEN ACCESS Data-driven Reduced Order Model for prediction of wind turbine wakes To cite this article: G V Iungo et al 2015 J. Phys.: Conf. Ser. 625 012009 View
More informationAlignment of stress, mean wind, and vertical gradient of the velocity vector
Downloaded from orbit.dtu.dk on: Sep 14, 218 Alignment of stress, mean wind, and vertical gradient of the velocity vector Berg, Jacob; Mann, Jakob; Patton, E.G. Published in: Extended Abstracts of Presentations
More informationEvaluating winds and vertical wind shear from Weather Research and Forecasting model forecasts using seven planetary boundary layer schemes
WIND ENERGY Wind Energ. 2014; 17:39 55 Published online 28 October 2012 in Wiley Online Library (wileyonlinelibrary.com)..1555 RESEARCH ARTICLE Evaluating winds and vertical wind shear from Weather Research
More informationComparison of Mean and Dynamic Wake Characteristics between Research-Scale and Full- Scale Wind Turbines
Journal of Physics: Conference Series PAPER OPEN ACCESS Comparison of Mean and Dynamic Wake Characteristics between Research-Scale and Full- Scale Wind Turbines To cite this article: P. Doubrawa et al
More informationFatigue Reliability and Effective Turbulence Models in Wind Farms
Downloaded from vbn.aau.dk on: marts 28, 2019 Aalborg Universitet Fatigue Reliability and Effective Turbulence Models in Wind Farms Sørensen, John Dalsgaard; Frandsen, S.; Tarp-Johansen, N.J. Published
More informationThe selective dynamical downscaling method for extreme wind atlases. Xiaoli Guo Larsén Jake Badger Andrea N. Hahmann Søren Ott
The selective dynamical downscaling method for extreme wind atlases Xiaoli Guo Larsén Jake Badger Andrea N. Hahmann Søren Ott 1 EWEC 2011 Why is such a method needed? Lack of long term measurements Global
More informationHow Many Model Evaluations Are Required To Predict The AEP Of A Wind Power Plant?
Journal of Physics: Conference Series PAPER OPE ACCESS How Many Model Evaluations Are Required To Predict The AEP Of A Wind Power Plant? To cite this article: J P Murcia et al 2015 J. Phys.: Conf. Ser.
More informationMeasurements and Simulations of Wakes in Onshore Wind Farms Julie K. Lundquist 1,2
Measurements and Simulations of Wakes in Onshore Wind Farms Julie K. Lundquist 1,2 1 University of Colorado Boulder, 2 National Renewable Energy Laboratory NORCOWE 2016, 14 16 Sept 2016, Bergen, Norway
More informationIMPLEMENTATION OF PRESSURE BASED SOLVER FOR SU2. 3rd SU2 Developers Meet Akshay.K.R, Huseyin Ozdemir, Edwin van der Weide
IMPLEMENTATION OF PRESSURE BASED SOLVER FOR SU2 3rd SU2 Developers Meet Akshay.K.R, Huseyin Ozdemir, Edwin van der Weide Content ECN part of TNO SU2 applications at ECN Incompressible flow solver Pressure-based
More informationImplementation of an advanced beam model in BHawC
Journal of Physics: Conference Series PAPER OPEN ACCESS Implementation of an advanced beam model in BHawC To cite this article: P J Couturier and P F Skjoldan 28 J. Phys.: Conf. Ser. 37 625 Related content
More informationUncertainty in wind climate parameters and the consequence for fatigue load assessment
Uncertainty in wind climate parameters and the consequence for fatigue load assessment Henrik Stensgaard Toft (1,2) Lasse Svenningsen (2), Morten Lybech Thøgersen (2), John Dalsgaard Sørensen (1) (1) Aalborg
More informationChuichi Arakawa Graduate School of Interdisciplinary Information Studies, the University of Tokyo. Chuichi Arakawa
Direct Numerical Simulations of Fundamental Turbulent Flows with the Largest Grid Numbers in the World and its Application of Modeling for Engineering Turbulent Flows Project Representative Chuichi Arakawa
More informationWind-turbine wakes responding to stably stratified flow over complex terrain
Journal of Physics: Conference Series PAPER OPEN ACCESS Wind-turbine wakes responding to stably stratified flow over complex terrain To cite this article: Antonia Englberger and Andreas Dörnbrack 2018
More informationConvective Fluxes: Sensible and Latent Heat Convective Fluxes Convective fluxes require Vertical gradient of temperature / water AND Turbulence ( mixing ) Vertical gradient, but no turbulence: only very
More informationEffect of Wind Turbine Wakes on the Performance of a Real Case WRF-LES Simulation
Effect of Wind Turbine Wakes on the Performance of a Real Case WRF-LES Simulation Paula Doubrawa 1, A. Montornès 2, R. J. Barthelmie 1, S. C. Pryor 1, G. Giroux 3, P. Casso 2 1 Cornell University, Ithaca,
More informationOn wake modeling, wind-farm gradients, and AEP predictions at the Anholt wind farm
https://doi.org/.5194/wes-3-191-2018 Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. On wake modeling, wind-farm gradients, and AEP predictions at the Anholt
More informationSimulating wind energy resources with mesoscale models: Intercomparison of stateof-the-art
Downloaded from orbit.dtu.dk on: Nov 01, 2018 Simulating wind energy resources with mesoscale models: Intercomparison of stateof-the-art models Olsen, Bjarke Tobias; Hahmann, Andrea N.; Sempreviva, Anna
More informationBoundary Layer Meteorology. Chapter 2
Boundary Layer Meteorology Chapter 2 Contents Some mathematical tools: Statistics The turbulence spectrum Energy cascade, The spectral gap Mean and turbulent parts of the flow Some basic statistical methods
More informationInvestigating low-level jet wind profiles using two different lidars
Investigating low-level jet wind profiles using two different lidars B.J. Vanderwende 1 J.K. Lundquist 1,2 1. Atmospheric and Oceanic Sciences University of Colorado Boulder, CO USA 2. National Renewable
More informationComparison of 3D turbulence measurements using three staring wind lidars and a sonic anemometer
Comparison of 3D turbulence measurements using three staring wind lidars and a sonic anemometer J. Mann, J.-P. Cariou, M.S. Courtney, R. Parmentier, T. Mikkelsen, R. Wagner, P. Lindelöw, M. Sjöholm and
More informationAnalysis of Near-Surface Oceanic Measurements Obtained During CBLAST-Low
Analysis of Near-Surface Oceanic Measurements Obtained During CBLAST-Low John H. Trowbridge Woods Hole Oceanographic Institution, MS#12, Woods Hole, MA 02543 phone: (508) 289-2296 fax: (508) 457-2194 email:
More informationAirfoil data sensitivity analysis for actuator disc simulations used in wind turbine applications
Journal of Physics: Conference Series OPEN ACCESS Airfoil data sensitivity analysis for actuator disc simulations used in wind turbine applications To cite this article: Karl Nilsson et al 24 J. Phys.:
More informationThe use of high resolution prediciton models for energy asessment -challenges in cold climate. Gard Hauge
The use of high resolution prediciton models for energy asessment -challenges in cold climate Gard Hauge gard.hauge@stormgeo.com Outline Models and methods Wind Resource Mapping Challenges in cold climate
More informationRemote Wind Measurements Offshore Using Scanning LiDAR Systems
OWA Report Remote Wind Measurements Offshore Using Scanning LiDAR Systems Offshore Wind Accelerator Wakes 2014 Remote Wind Measurements Offshore Using Scanning LiDAR Systems Lee Cameron lee.cameron@res-group.com
More informationResolution of tower shadow models for downwind mounted rotors and its effects on the blade fatigue
Journal of Physics: Conference Series OPEN ACCESS Resolution of tower shadow models for downwind mounted rotors and its effects on the blade fatigue To cite this article: M Reiso and M Muskulus 2014 J.
More informationDamage detection in wind turbine blades using time-frequency analysis of vibration signals
Dublin Institute of Technology From the SelectedWorks of Breiffni Fitzgerald Damage detection in wind turbine blades using time-frequency analysis of vibration signals Breiffni Fitzgerald, Dublin Institute
More informationValidation of the actuator line and disc techniques using the New MEXICO measurements
Downloaded from orbit.dtu.dk on: Dec, 7 Validation of the actuator line and disc techniques using the New MEXICO measurements Sarmast, Sasan; Shen, Wen Z.; Zhu, Wei Jun; Mikkelsen, Robert Flemming; Breton,
More informationA Procedure for Classification of Cup-Anemometers
Downloaded from orbit.dtu.dk on: Dec, 17 A Procedure for Classification of Cup-Anemometers Friis Pedersen, Troels; Paulsen, Uwe Schmidt Published in: Proceedings of EWEC 97 Publication date: 1997 Link
More informationChapter (3) TURBULENCE KINETIC ENERGY
Chapter (3) TURBULENCE KINETIC ENERGY 3.1 The TKE budget Derivation : The definition of TKE presented is TKE/m= e = 0.5 ( u 2 + v 2 + w 2 ). we recognize immediately that TKE/m is nothing more than the
More informationNicola Bodini et al. Correspondence to: Nicola Bodini
Supplement of Atmos. Meas. Tech., 11, 4291 4308, 2018 https://doi.org/10.5194/amt-11-4291-2018-supplement Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. Supplement
More informationChapter 7 The Time-Dependent Navier-Stokes Equations Turbulent Flows
Chapter 7 The Time-Dependent Navier-Stokes Equations Turbulent Flows Remark 7.1. Turbulent flows. The usually used model for turbulent incompressible flows are the incompressible Navier Stokes equations
More informationPart I: Dry Convection
Turbulent dispersion and chemical transformation in the atmospheric boundary layer: Part I: Dry Convection DISPERSION Thanks: Alessandro Dosio Jordi Vilà-Guerau de Arellano WA G E N I N G E N U N I VE
More informationMechanical Engineering for Renewable Energy Systems. Dr. Digby Symons. Wind Turbine Blade Design
ENGINEERING TRIPOS PART IB PAPER 8 ELECTIVE () Mechanical Engineering for Renewable Energy Systems Dr. Digby Symons Wind Turbine Blade Design Student Handout CONTENTS 1 Introduction... 3 Wind Turbine Blade
More informationFlap testing on the rotating test rig in the INDUFLAP project
Downloaded from orbit.dtu.dk on: Dec 26, 2018 Flap testing on the rotating test rig in the INDUFLAP project Barlas, Athanasios; Aagaard Madsen, Helge; Enevoldsen, Karen; Klemmensen, Kasper Publication
More informationOctober 1991 J. Wang and Y. Mitsuta 587 NOTES AND CORRESPONDENCE. Turbulence Structure and Transfer Characteristics
October 1991 J. Wang and Y. Mitsuta 587 NOTES AND CORRESPONDENCE Turbulence Structure and Transfer Characteristics in the Surface Layer of the HEIFE Gobi Area By Jiemin Wang Lanzhou Institute of Plateau
More informationWASA Project Team. 13 March 2012, Cape Town, South Africa
Overview of Wind Atlas for South Africa (WASA) project WASA Project Team 13 March 2012, Cape Town, South Africa Outline The WASA Project Team The First Verified Numerical Wind Atlas for South Africa The
More informationPerformance and Equivalent Loads of Wind Turbines in Large Wind Farms.
Performance and Equivalent Loads of Wind Turbines in Large Wind Farms. Søren Juhl Andersen 1, Jens Nørkær Sørensen, and Robert Mikkelsen May 30, 2017 Email: 1 sjan@dtu.dk Andersen Performance of Large
More informationWhy WASA an introduction to the wind atlas method and some applications
Why WASA an introduction to the wind atlas method and some applications Jens Carsten Hansen and Niels G. Mortensen DTU Wind Energy (Dept of Wind Energy, Technical University of Denmark) Eugene Mabille,
More informationSteven Greco* and George D. Emmitt Simpson Weather Associates, Charlottesville, VA. 2. Experiments
3.3 INVESTIGATION OF FLOWS WITHIN COMPLEX TERRAIN AND ALONG COASTLINES USING AN AIRBORNE DOPPLER WIND LIDAR: OBSERVATIONS AND MODEL COMPARISONS Steven Greco* and George D. Emmitt Simpson Weather Associates,
More informationTHE EFFECT OF STRATIFICATION ON THE ROUGHNESS LENGTH AN DISPLACEMENT HEIGHT
THE EFFECT OF STRATIFICATION ON THE ROUGHNESS LENGTH AN DISPLACEMENT HEIGHT S. S. Zilitinkevich 1,2,3, I. Mammarella 1,2, A. Baklanov 4, and S. M. Joffre 2 1. Atmospheric Sciences,, Finland 2. Finnish
More informationThe Long distance wake behind Horns Rev I studied using large eddy simulations and a wind turbine parameterization in WRF
Journal of Physics: Conference Series PAPER OPEN ACCESS The Long distance wake behind Horns Rev I studied using large eddy simulations and a wind turbine parameterization in WRF To cite this article: O
More informationA Discussion on The Effect of Mesh Resolution on Convective Boundary Layer Statistics and Structures Generated by Large-Eddy Simulation by Sullivan
耶鲁 - 南京信息工程大学大气环境中心 Yale-NUIST Center on Atmospheric Environment A Discussion on The Effect of Mesh Resolution on Convective Boundary Layer Statistics and Structures Generated by Large-Eddy Simulation
More informationOn the impact of non-gaussian wind statistics on wind turbines - an experimental approach
On the impact of non-gaussian wind statistics on wind turbines - an experimental approach Jannik Schottler, N. Reinke, A. Hölling, J. Peinke, M. Hölling ForWind, Center for Wind Energy Research University
More informationToward Isolation of Salient Features in Stable Boundary Layer Wind Fields that Influence Loads on Wind Turbines
Energies 5, 8, 977-3; doi:.339/en84977 OPEN ACCESS energies ISSN 996-73 www.mdpi.com/journal/energies Article Toward Isolation of Salient Features in Stable Boundary Layer Wind Fields that Influence Loads
More informationKommerciel arbejde med WAsP
Downloaded from orbit.dtu.dk on: Dec 19, 2017 Kommerciel arbejde med WAsP Mortensen, Niels Gylling Publication date: 2002 Document Version Peer reviewed version Link back to DTU Orbit Citation (APA): Mortensen,
More informationBOUNDARY LAYER STRUCTURE SPECIFICATION
August 2017 P09/01X/17 BOUNDARY LAYER STRUCTURE SPECIFICATION CERC In this document ADMS refers to ADMS 5.2, ADMS-Roads 4.1, ADMS-Urban 4.1 and ADMS-Airport 4.1. Where information refers to a subset of
More informationLarge eddy simulation studies on convective atmospheric boundary layer
Large eddy simulation studies on convective atmospheric boundary layer Antti Hellsten & Sergej Zilitinkevich Finnish Meteorological Institute Outline Short introduction to atmospheric boundary layer (ABL)
More informationNumerical Investigation of Aerodynamic Performance and Loads of a Novel Dual Rotor Wind Turbine
energies Article Numerical Investigation of Aerodynamic Performance and Loads of a Novel Dual Rotor Wind Turbine Behnam Moghadassian, Aaron Rosenberg and Anupam Sharma * Department of Aerospace Engineering,
More informationAssessment of QPE results from 4 kw X-band Local Area Weather Radar (LAWR) evaluated with S-band radar data
Assessment of QPE results from 4 kw X-band Local Area Weather Radar (LAWR) evaluated with S-band radar data Lisbeth Pedersen 1+3, Isztar. Zawadzki 2, Niels Einar Jensen 1 and Henrik Madsen 3, (1) DHI,
More informationA Note on the Estimation of Eddy Diffusivity and Dissipation Length in Low Winds over a Tropical Urban Terrain
Pure appl. geophys. 160 (2003) 395 404 0033 4553/03/020395 10 Ó Birkhäuser Verlag, Basel, 2003 Pure and Applied Geophysics A Note on the Estimation of Eddy Diffusivity and Dissipation Length in Low Winds
More informationA turbine interaction model for choosing operating points in wind farms
A turbine interaction model for choosing operating points in wind farms Daria Madjidian and Anders Rantzer Dept. of Automatic Control Lund University Outline Motivation Modeling Examples Summary Motivation
More informationBoundary-Layer Study at FINO1
Martin Flügge (CMR), Benny Svardal (CMR), Mostafa Bakhoday Paskyabi (UoB), Ilker Fer (UoB), Stian Stavland (CMR), Joachim Reuder (UoB), Stephan Kral (UoB) and Valerie-Marie Kumer (UoB) Boundary-Layer Study
More informationMesoscale meteorological models. Claire L. Vincent, Caroline Draxl and Joakim R. Nielsen
Mesoscale meteorological models Claire L. Vincent, Caroline Draxl and Joakim R. Nielsen Outline Mesoscale and synoptic scale meteorology Meteorological models Dynamics Parametrizations and interactions
More information8 Lidars and wind turbine control
8 Lidars and wind turbine control David Schlipf, Oliver Bischoff, Martin Hofsäß, Andreas Rettenmeier, Juan José Trujillo, and Martin Kühn Endowed Chair of Wind Energy, Institute of Aircraft Design, Universität
More informationWhy are lidars so uncertain? Why are lidars cups so uncertain? Mike Courtney EWEA Resource Asessment Workshop, Helsinki, June 2, 2015
Why are lidars so uncertain? Why are lidars cups so uncertain? Mike Courtney mike@dtu.dk EWEA Resource Asessment Workshop, Helsinki, June 2, 2015 Summary Lidar calibrations against cup anemometers Have
More informationLidar calibration What s the problem?
Downloaded from orbit.dtu.dk on: Feb 05, 2018 Lidar calibration What s the problem? Courtney, Michael Publication date: 2015 Document Version Peer reviewed version Link back to DTU Orbit Citation (APA):
More informationRisø-R-1133(EN) Mean Gust Shapes. Gunner Chr. Larsen, Wim Bierbooms and Kurt S. Hansen
Risø-R-33(EN) Mean Gust Shapes Gunner Chr. Larsen, Wim Bierbooms and Kurt S. Hansen Risø National Laboratory, Roskilde, Denmark December 3 Abstract The gust events described in the IEC-standard are formulated
More informationReduction of unwanted swings and motions in floating wind turbines
Reduction of unwanted swings and motions in floating wind turbines L F Recalde, W E Leithead Department of Electronic and Electrical Engineering, Wind Energy and Control, University of Strathclyde, Glasgow,
More informationMultivariate Modelling of Extreme Load Combinations for Wind Turbines
Downloaded from orbit.dtu.dk on: Oct 05, 2018 Multivariate Modelling of Extreme Load Combinations for Wind Turbines Dimitrov, Nikolay Krasimirov Published in: Proceedings of the 12th International Conference
More informationMechanical Engineering for Renewable Energy Systems. Wind Turbines
ENGINEERING TRIPOS PART IB PAPER 8 - ELECTIVE (2) Mechanical Engineering for Renewable Energy Systems Wind Turbines Lecture 3: Aerodynamic fundamentals Hugh Hunt Fundamental fluid mechanics limits to energy
More informationWind Flow Modeling The Basis for Resource Assessment and Wind Power Forecasting
Wind Flow Modeling The Basis for Resource Assessment and Wind Power Forecasting Detlev Heinemann ForWind Center for Wind Energy Research Energy Meteorology Unit, Oldenburg University Contents Model Physics
More informationBIAS ON THE WIND-SPEED GUST CAUSED BY QUANTIZATION AND DISJUNCT SAMPLING OF THE CUP-ANEMOMETER SIGNAL
BIAS ON THE WIND-SPEED GUST CAUSED BY QUANTIZATION AND DISJUNCT SAMPLING OF THE CUP-ANEMOMETER SIGNAL Presentation of Main Results L. Kristensen & Ole Frost Hansen January 16, 7 We are here concerned with
More informationExtreme Winds in the Western North Pacific. Søren Ott
in the Western North Pacific Søren Ott Outline Tropical cyclones and wind turbines Modelling extreme winds Validation Conclusions Cat. 4 tropical cyclone IVAN 15 Sept 2004 at landfall near Luisiana, USA
More information