Wake decay constant for the infinite wind turbine array Application of asymptotic speed deficit concept to existing engineering wake model
|
|
- Aron Kelly
- 5 years ago
- Views:
Transcription
1 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; Frandsen, Sten Tronæs; Nielsen, Morten Published in: EWEC 200 Proceedings online Publication date: 200 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Rathmann, O., Frandsen, S. T., & Nielsen, M. (200). Wake decay constant for the infinite wind turbine array: Application of asymptotic speed deficit concept to existing engineering wake model. In EWEC 200 Proceedings online European Wind Energy Association (EWEA). General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
2 WAKE DECAY FOR THE INFINITE WIND TURBINE ARRAY Application of asymptotic speed deficit concept to existing engineering wake model Ole Rathmann, Sten Frandsen and Morten Nielsen Risoe-DTU, National Laboratory for Sustainable Energy Acknowledments: Dong, Vattenfall for providing data EU Upwind, Danish Strategic Research Council, Energinet.dk (PSO) for sponsoring the work Technical topic Wakes ID265 Wake Decay for the Infinite Wind Turbine Array []
3 WAKE DECAY FOR THE INFINITE WIND TURBINE ARRAY Application of asymptotic speed deficit concept to existing engineering wake model Outline Background Asymptotic speed deficit from boundary layer considerations WAsP Park model details Asymptotic speed deficit of the WAsP Park model Adjustment of WAsP Park model Comparative wind farm predictions Conclusions Wake Decay for the Infinite Wind Turbine Array [2]
4 Background Very large wind farms: Standard wake models seems to underpredict wake effects. Recent investigations by Sten Frandsen [, 2]: The reason is the lack of accounting for the effect a large wind farm may have on the atmospheric boundary layer, e.g. by modifying the vertical wind profile. In some way the effect of an extended wind farm resembles that of a change in surface roughness: increased equivalent roughness length. Idea: While more detailed models are underway [3], modify the existing WAsP Park engineering wind farm wake model to take this boundary-layer effect into account. [] Frandsen, S.T., Barthelmie, R.J., Pryor, S.C., Rathmann, O., Larsen, S., Højstrup, J. and M. Thøgersen, Analytical modelling of wind speed deficit in large offshore wind farms. Wind Energ. 2006, 9: [2] Frandsen, S: The wake-decay constant for the infinite row of wind turbine rotors. Draft paper (2009 ). [3] Rathmann O., Frandsen S, Barthelmie R., Wake Modelling for intermediate and large wind farms, Paper BL3.99, EWEC 2007 Wake Decay for the Infinite Wind Turbine Array [3]
5 Asymptotic speed deficit from boundary layer considerations () When should a wind farm be considered as large/infinite? (Hand drawing illustrating the initial idea) Wake Decay for the Infinite Wind Turbine Array [4]
6 Asymptotic speed deficit from boundary layer considerations (2) BL-Limited infinite wind farm Geostrophic wind speed U ( z z > H ) = G Roughness z 00 ln(z) H Outer layer Friction velocity u 0 Hub height shear t = ρc 2 t U h U h Jump in friction velocity at hub-height due to rotor thrust: ρ(u * eff ) 2 = ρ(u *i ) 2 + t Inner layer u i, z 0 c 2 t = π/8 C t /(s r s f ), t = ρc t U h s r and s f : dimensionless* WTG-distances (along- and across-wind) *by D rotor Z<h: profile according to ground surface friction velocity u *i / roughness z 0. U Approximation: homogeneously distributed thrust c t Z>h: profile according to increased friction velocity u eff * (= u *0 ) / roughness z eff 0 (=z 00 ). ( ) eff Equivalent, effective surface roughness: z = h exp κ / c + ( κ / ln( h / z )) 0 H t H 0 2 Wake Decay for the Infinite Wind Turbine Array [5]
7 Asymptotic speed deficit from boundary layer considerations (3) Approximate geostrophic drag-law G u ln κ G fz 0 A G General hub-height wind speed: Uh ( ) = ln G + A* i h f Free flow: i = /ln h 0 z 0 Flow over wind farm: i = i + i i = 2 2 Tot 0 add, add c κ t G + ln i ' h f Relative speed deficit ε: ε = G + ln i h f ' 0 Tot Wake Decay for the Infinite Wind Turbine Array [6]
8 Asymptotic speed deficit from boundary layer considerations (3) Comparison with wind farm (Horns Rev): 0.9 s r s f 7, h=80m, D R = 60 m 0.85 Wake deficit about 50% of the BLlimiting value. Horns Rev wind farm NOT infinite. Speed ratio Ct=0.4, z0= Ct=0.4, Z0= Ct=0.8, z0=0.0 Ct=0.8, z0= Data Free wind speed (m/s) Distance for severe wake interference (k wake =0.075) Horns Rev Power density (W/m 2 )[4] Actual extension Horns Rev 2MW turb s (observed) Entire North Sea 5 MW turb s (Frandsen BL-limited) 7.5 km 5 km [4] Barthelmie,R.J., Frandsen,S.T.,., Pryor, S.C., Energy dynamics of an infinitely large offshore wind farm., Paper 24, European Offshore WInd 2009 Conference and Exhibition, Stockholm, Sweden (Sept. 2009). Wake Decay for the Infinite Wind Turbine Array [7]
9 WAsP Park Model Details Wake Evolution and speed deficit [5,6] Adir.overlap( =A (R) ) Aref.overlap Speed deficit from single wake: D ( yp ) ( t ) A ( type ) 0 type overlap 0 0 ( R) D0 + 2kX0 A δvδ V = U C, ( type) = " dir.", " ref." Resulting speed deficit at a downwind turbine: dir ref ((, ) (, ) ) δv = δv + δv 2 (.) 2 (.) 2 turb i turb i turb i upwturb. ' s 2 [5] N.O.Jensen, A Note on Wind Generator Interaction, Risø-M-24, Risø National Laboratory 983. [6] I.Katic, J.Højstrup, N.O.Jensen, A Simple Model for Cluster Effeciency, Paper C6, EWEC 2006, Rome, Italy, 986. Wake Decay for the Infinite Wind Turbine Array [8]
10 Asymptotic speed deficit of the WAsP Park model Speed deficit for a turbine in an infinite wind farm Speed deficit the same for all turbines, thus also the turbine thrusts. Infinite (convergent!!) sum: ( ) 2 δ 2 D ( ) ( ) 2 R V U ε upwind 0 N( s ) ε j w( xj ) ; ε = w( x) = ; ε 0 = Ct j= The infinite sum may be approximated by an infinite integral - a simple function G: δ V Park = G k; sr, s f, h/ DR, Ct U ε D R + 2kx x j : Distance to upwind turbine row j. N(x j ): number of turbines row j throwing wake on the rotor in focus. U upwind : Wind speed immediately upwind of a turbine upwind 0 ( ) G park s r = s f = 7; h/d R = Since U upwind = U w = U free -δv: Wake expansion coefficient k δv U Free app ε w app park = εw = ; εw = ε0g ( layout; k) app + ε w Wake Decay for the Infinite Wind Turbine Array [9]
11 Adjustment of the WAsP Park model Adjustment to match the BL based asymptotic speed deficit For deep positions the wake expansion coefficient k of the Park Model is modified to approach the BL-based asymptotic speed deficit value k inf : δvinfin. park ( kinf ;[ sr, sf, h, Ct ]) = δvbl based ( sr, sf, h, Ct ) Wake expansion coefficient k Original Adjusted to match asymptotic speed deficit The k-change applies when a wake overlaps with a downwind rotor (to both wakes involved), using a relaxation factor F relax : A adj adj adj overlap k = k + ( k + k ) F A j j inf j relax w The change of the wake expansion cofficient is indicated. segment j segment j+ Model-paramters used in the following (based on Horns Rev data): k initial := (recommended value for onshore!) F relax = 0.2 relax Wake Decay for the Infinite Wind Turbine Array [0]
12 Comparative wind farm predictions: Horns Rev () Turbines: 2MW, D R = 80m, H hub = 60m Layout: s r = s f = 7 Wake Decay for the Infinite Wind Turbine Array []
13 Comparative wind farm predictions: Horns Rev (2) ed el. reduced wind spee R e Horns Rev m/s o Data Pred. BL-Adjusted Pred. Std. park Wind direction: 270 o +/- 3 o Wind speed: 8.5 m/s +/- 0.5 m/s Downwind distance [m] Horns Rev m/s o Data - int.line Data - ext.line Pred. BL-Adjusted d Re el. reduced wind speed Pred. Std. park Wind direction: 270 o +/- 3 o Wind speed: 2.0 m/s +/- 0.5 m/s Downwind distance [m] Wake Decay for the Infinite Wind Turbine Array [2]
14 Comparative wind farm predictions: Horns Rev (3) Rel. R reduced wind speed Horns Rev m/s o (int.line) Data - int.line Pred. BL-Adjusted Pred. Std. park Rel. reduced wind speed Horns Rev m/s o (ext.line) Data - int.line Pred. BL-Adjusted Pred. Std. park Wind direction: 222 o +/- 3 o Wind speed: 8.5 m/s +/- 0.5 m/s Downwind distance [m] Downwind distance [m] Rel. reduced wind speed d Horns Rev m/s o (int.line) Data - int.line Pred. BL-Adjusted Pred. Std. park Rel. reduced wind spee ed Horns Rev m/s o (ext.line) Data - int.line Pred. BL-Adjusted Pred. Std. park Wind direction: 222 o +/- 3 o Wind speed: 2.0 m/s +/- 0.5 m/s Downwind distance [m] Downwind distance [m] Wake Decay for the Infinite Wind Turbine Array [3]
15 Comparative wind farm predictions: Nysted () Turbines: 2.33 MW, D R = 82m, H hub = 69m Layout: s r = 0.6, s f = 5.9 Wake Decay for the Infinite Wind Turbine Array [4]
16 Comparative wind farm predictions: Nysted(2) Rel. reduced turbine power Nysted -0.0 m/s o Data Pred. BL-Adjusted Pred. Std. park Wind direction: 278 o +/- 2.5 o Wind speed: 0.0 m/s +/- 0.5 m/s Downwind distance [m].2 Rel. reduced turbine power 0.8 Nysted -0.2 m/s o Data Pred. BL-Adjusted Pred. Std. park Wind direction: 263 o +/- 2.5 o Wind speed: 0.2 m/s +/- 0.5 m/s Downwind distance [m] Wake Decay for the Infinite Wind Turbine Array [5]
17 Conclusions The adjustment of the wake expansion coefficient towards a value matching the BL-limited asymptotic speed deficit seems a valuable engineering approach A value for the wake expansion coefficient close to that normally used for onshore locations seems reasonable in this approach also for off-shore wind farms The model (relaxation factor) needs to be fine-tuned in order not to produce over estimations. The model needs to be tested t on situations ti with wake effects between neighboring wind farms. Wake Decay for the Infinite Wind Turbine Array [6]
Validation 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 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 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 informationImpact of the interfaces for wind and wave modeling - interpretation using COAWST, SAR and point measurements
Downloaded from orbit.dtu.dk on: Oct 21, 2018 Impact of the interfaces for wind and wave modeling - interpretation using COAWST, SAR and point measurements Larsén, Xiaoli Guo; Du, Jianting; Bolanos, Rodolfo;
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 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 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 informationGlobal Wind Atlas validation and uncertainty
Downloaded from orbit.dtu.dk on: Nov 26, 20 Global Wind Atlas validation and uncertainty Mortensen, Niels Gylling; Davis, Neil; Badger, Jake; Hahmann, Andrea N. Publication date: 20 Document Version Publisher's
More informationApplication of mesoscale models with wind farm parametrisations in EERA-DTOC
Downloaded from orbit.dtu.dk on: Dec 21, 2017 Application of mesoscale models with wind farm parametrisations in EERA-DTOC Volker, Patrick; Badger, Jake; Hahmann, Andrea N.; Hansen, S.; Badger, Merete;
More informationValidation and comparison of numerical wind atlas methods: the South African example
Downloaded from orbit.dtu.dk on: Jul 18, 2018 Validation and comparison of numerical wind atlas methods: the South African example Hahmann, Andrea N.; Badger, Jake; Volker, Patrick; Nielsen, Joakim Refslund;
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 informationPrediction of airfoil performance at high Reynolds numbers.
Downloaded from orbit.dtu.dk on: Nov 04, 2018 Prediction of airfoil performance at high Reynolds numbers. Sørensen, Niels N.; Zahle, Frederik; Michelsen, Jess Publication date: 2014 Document Version Publisher's
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 informationSteady State Comparisons HAWC2 v12.2 vs HAWCStab2 v2.12
Downloaded from orbit.dtu.dk on: Jan 29, 219 Steady State Comparisons v12.2 vs v2.12 Verelst, David Robert; Hansen, Morten Hartvig; Pirrung, Georg Publication date: 216 Document Version Publisher's PDF,
More informationComparisons of winds from satellite SAR, WRF and SCADA to characterize coastal gradients and wind farm wake effects at Anholt wind farm
Downloaded from orbit.dtu.dk on: Dec 10, 2018 Comparisons of winds from satellite SAR, WRF and SCADA to characterize coastal gradients and wind farm wake effects at Anholt wind farm Hasager, Charlotte
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 informationVindkraftmeteorologi - metoder, målinger og data, kort, WAsP, WaSPEngineering,
Downloaded from orbit.dtu.dk on: Dec 19, 2017 Vindkraftmeteorologi - metoder, målinger og data, kort, WAsP, WaSPEngineering, meso-scale metoder, prediction, vindatlasser worldwide, energiproduktionsberegninger,
More informationOptimizing Reliability using BECAS - an Open-Source Cross Section Analysis Tool
Downloaded from orbit.dtu.dk on: Dec 20, 2017 Optimizing Reliability using BECAS - an Open-Source Cross Section Analysis Tool Bitsche, Robert; Blasques, José Pedro Albergaria Amaral Publication date: 2012
More informationMatrix representation of a Neural Network
Downloaded from orbit.dtu.dk on: May 01, 2018 Matrix representation of a Neural Network Christensen, Bjørn Klint Publication date: 2003 Document Version Publisher's PDF, also known as Version of record
More informationApplication of the wind atlas for Egypt
Downloaded from orbit.dtu.dk on: Dec 19, 2017 Application of the wind atlas for Egypt Mortensen, Niels Gylling Publication date: 2005 Document Version Peer reviewed version Link back to DTU Orbit Citation
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 informationReflection of sound from finite-size plane and curved surfaces
Downloaded from orbit.dtu.dk on: Sep, 08 Reflection of sound from finite-size plane and curved surfaces Rindel, Jens Holger Published in: Journal of the Acoustical Society of America Publication date:
More informationConcept Testing of a Simple Floating Offshore Vertical Axis Wind Turbine
Downloaded from orbit.dtu.dk on: Nov 18, 2018 Concept Testing of a Simple Floating Offshore Vertical Axis Wind Turbine Pedersen, Troels Friis; Schmidt Paulsen, Uwe; Aagaard Madsen, Helge; Nielsen, Per
More informationNumerical modeling of the conduction and radiation heating in precision glass moulding
Downloaded from orbit.dtu.dk on: May 02, 2018 Numerical modeling of the conduction and radiation heating in precision glass moulding Sarhadi, Ali; Hattel, Jesper Henri; Hansen, Hans Nørgaard; Tutum, Cem
More informationAalborg Universitet. Lecture 14 - Introduction to experimental work Kramer, Morten Mejlhede. Publication date: 2015
Aalborg Universitet Lecture 14 - Introduction to experimental work Kramer, Morten Mejlhede Publication date: 2015 Document Version Publisher's PDF, also known as Version of record Link to publication from
More informationAnalytical Studies of the Influence of Regional Groundwater Flow by on the Performance of Borehole Heat Exchangers
Analytical Studies of the Influence of Regional Groundwater Flow by on the Performance of Borehole Heat Exchangers Claesson, Johan; Hellström, Göran Published in: [Host publication title missing] Published:
More informationThe dipole moment of a wall-charged void in a bulk dielectric
Downloaded from orbit.dtu.dk on: Dec 17, 2017 The dipole moment of a wall-charged void in a bulk dielectric McAllister, Iain Wilson Published in: Proceedings of the Conference on Electrical Insulation
More informationRadioactivity in the Risø District July-December 2013
Downloaded from orbit.dtu.dk on: Jan 02, 2019 Radioactivity in the Risø District July-December 2013 Nielsen, Sven Poul; Andersson, Kasper Grann; Miller, Arne Publication date: 2014 Document Version Publisher's
More informationAccelerating interior point methods with GPUs for smart grid systems
Downloaded from orbit.dtu.dk on: Dec 18, 2017 Accelerating interior point methods with GPUs for smart grid systems Gade-Nielsen, Nicolai Fog Publication date: 2011 Document Version Publisher's PDF, also
More informationGenerating the optimal magnetic field for magnetic refrigeration
Downloaded from orbit.dtu.dk on: Oct 17, 018 Generating the optimal magnetic field for magnetic refrigeration Bjørk, Rasmus; Insinga, Andrea Roberto; Smith, Anders; Bahl, Christian Published in: Proceedings
More informationA Note on Powers in Finite Fields
Downloaded from orbit.dtu.dk on: Jul 11, 2018 A Note on Powers in Finite Fields Aabrandt, Andreas; Hansen, Vagn Lundsgaard Published in: International Journal of Mathematical Education in Science and Technology
More informationMeasurements of the angular distribution of diffuse irradiance
Downloaded from orbit.dtu.dk on: Nov 02, 2018 Measurements of the angular distribution of diffuse irradiance Nielsen, Elsabet Nomonde Noma; Nielsen, Kristian Pagh ; Dragsted, Janne; Furbo, Simon Published
More informationModelling Salmonella transfer during grinding of meat
Downloaded from orbit.dtu.dk on: Nov 24, 2018 Modelling Salmonella transfer during grinding of meat Hansen, Tina Beck Publication date: 2017 Document Version Publisher's PDF, also known as Version of record
More informationDetermination of packaging induced 3D stress utilizing a piezocoefficient mapping device
Downloaded from orbit.dtu.dk on: Dec 15, 2018 Determination of packaging induced 3D stress utilizing a piezocoefficient mapping device Richter, Jacob; Hyldgård, A.; Birkelund, Karen; Arnoldus, Morten Berg;
More informationSAR-based wind climatology for wind turbines
Downloaded from orbit.dtu.dk on: Dec 16, 2017 SAR-based wind climatology for wind turbines Badger, Merete; Hasager, Charlotte Bay; Nielsen, Morten; Astrup, Poul; Badger, Jake; Mortensen, Niels Gylling;
More informationAn Equivalent Source Method for Modelling the Lithospheric Magnetic Field Using Satellite and Airborne Magnetic Data
Downloaded from orbit.dtu.dk on: Oct 03, 2018 An Equivalent Source Method for Modelling the Lithospheric Magnetic Field Using Satellite and Airborne Magnetic Data Kother, Livia Kathleen; D. Hammer, Magnus;
More informationCrack Tip Flipping: A New Phenomenon yet to be Resolved in Ductile Plate Tearing
Downloaded from orbit.dtu.dk on: Jan 06, 2019 Crack Tip Flipping: A New Phenomenon yet to be Resolved in Ductile Plate Tearing Nielsen, Kim Lau Published in: Proceedings of the 30th Nordic Seminar on Computational
More informationRadioactivity in the Risø District January-June 2014
Downloaded from orbit.dtu.dk on: Dec 20, 2017 Radioactivity in the Risø District January-June 2014 Nielsen, Sven Poul; Andersson, Kasper Grann; Miller, Arne Publication date: 2014 Document Version Publisher's
More informationIrregular Wave Forces on Monopile Foundations. Effect af Full Nonlinearity and Bed Slope
Downloaded from orbit.dtu.dk on: Dec 04, 2017 Irregular Wave Forces on Monopile Foundations. Effect af Full Nonlinearity and Bed Slope Schløer, Signe; Bredmose, Henrik; Bingham, Harry B. Published in:
More informationBerøringsløs optisk måling af gassammensætning ved UV og IR spektroskopi
Downloaded from orbit.dtu.dk on: Dec 21 2017 Berøringsløs optisk måling af gassammensætning ved UV og IR spektroskopi Clausen Sønnik Publication date: 2008 Document Version Publisher's PDF also known as
More informationMulti-terminal Offshore Grid for the North Sea Region for 2030 and 2050 Scenarios
Downloaded from orbit.dtu.dk on: Jul 25, 2018 Multi-terminal Offshore Grid for the North Sea Region for 2030 and 2050 Scenarios Koivisto, Matti Juhani; Sørensen, Poul Ejnar; Maule, Petr; Traber, Thure
More informationPotential solution for rain erosion of wind turbine blades
Downloaded from orbit.dtu.dk on: Jun 28, 2018 Potential solution for rain erosion of wind turbine blades Hasager, Charlotte Bay; Bech, Jakob Ilsted; Kusano, Yukihiro; Sjöholm, Mikael; Mikkelsen, Torben
More informationOptimal acid digestion for multi-element analysis of different waste matrices
Downloaded from orbit.dtu.dk on: Sep 06, 2018 Optimal acid digestion for multi-element analysis of different waste matrices Götze, Ramona; Astrup, Thomas Fruergaard Publication date: 2014 Document Version
More informationDynamic Effects of Diabatization in Distillation Columns
Downloaded from orbit.dtu.dk on: Dec 27, 2018 Dynamic Effects of Diabatization in Distillation Columns Bisgaard, Thomas Publication date: 2012 Document Version Publisher's PDF, also known as Version of
More informationReflection and absorption coefficients for use in room acoustic simulations
Downloaded from orbit.dtu.dk on: May 1, 018 Reflection and absorption coefficients for use in room acoustic simulations Jeong, Cheol-Ho Published in: Proceedings of Spring Meeting of the Acoustical Society
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 informationA Trust-region-based Sequential Quadratic Programming Algorithm
Downloaded from orbit.dtu.dk on: Oct 19, 2018 A Trust-region-based Sequential Quadratic Programming Algorithm Henriksen, Lars Christian; Poulsen, Niels Kjølstad Publication date: 2010 Document Version
More informationThe Wien Bridge Oscillator Family
Downloaded from orbit.dtu.dk on: Dec 29, 207 The Wien Bridge Oscillator Family Lindberg, Erik Published in: Proceedings of the ICSES-06 Publication date: 2006 Link back to DTU Orbit Citation APA): Lindberg,
More informationThe new worldwide microscale wind resource assessment data on IRENA s Global Atlas. The EUDP Global Wind Atlas
Downloaded from orbit.dtu.dk on: Dec 25, 2017 The new worldwide microscale wind resource assessment data on IRENA s Global Atlas. The EUDP Global Wind Atlas Badger, Jake; Davis, Neil; Hahmann, Andrea N.;
More informationA systematic methodology for controller tuning in wastewater treatment plants
Downloaded from orbit.dtu.dk on: Dec 2, 217 A systematic methodology for controller tuning in wastewater treatment plants Mauricio Iglesias, Miguel; Jørgensen, Sten Bay; Sin, Gürkan Publication date: 212
More informationSound absorption properties of a perforated plate and membrane ceiling element Nilsson, Anders C.; Rasmussen, Birgit
Aalborg Universitet Sound absorption properties of a perforated plate and membrane ceiling element Nilsson, Anders C.; Rasmussen, Birgit Published in: Proceedings of Inter-Noise 1983 Publication date:
More informationMulti (building)physics modeling
Multi (building)physics modeling van Schijndel, A.W.M. Published: 01/01/2010 Document Version Publisher s PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check
More informationDesign of Robust AMB Controllers for Rotors Subjected to Varying and Uncertain Seal Forces
Downloaded from orbit.dtu.dk on: Nov 9, 218 Design of Robust AMB Controllers for Rotors Subjected to Varying and Uncertain Seal Forces Lauridsen, Jonas Skjødt; Santos, Ilmar Published in: Mechanical Engineering
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 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 informationCOMPARISON OF THERMAL HAND MODELS AND MEASUREMENT SYSTEMS
COMPARISON OF THERMAL HAND MODELS AND MEASUREMENT SYSTEMS Kuklane, Kalev Published in: [Host publication title missing] Published: 2014-01-01 Link to publication Citation for published version (APA): Kuklane,
More informationRealtime 3D stress measurement in curing epoxy packaging
Downloaded from orbit.dtu.dk on: Dec 17, 2017 Realtime 3D stress measurement in curing epoxy packaging Richter, Jacob; Hyldgård, A.; Birkelund, Karen; Hansen, Ole; Thomsen, Erik Vilain Published in: International
More informationHigher-order spectral modelling of the diffraction force around a vertical circular cylinder
Downloaded from orbit.dtu.dk on: Apr 10, 2018 Higher-order spectral modelling of the diffraction force around a vertical circular cylinder Bredmose, Henrik; Andersen, Søren Juhl Publication date: 2017
More informationConceptual design of a thorium supplied thermal molten salt wasteburner
Downloaded from orbit.dtu.dk on: Dec 20, 2017 Conceptual design of a thorium supplied thermal molten salt wasteburner Schönfeldt, Troels; Klinkby, Esben Bryndt; Klenø, K.H.; Boje, Peter; Eakes, C.; Pettersen,
More informationNeutronics calculations for the ITER Collective Thomson Scattering Diagnostics
Downloaded from orbit.dtu.dk on: Sep 04, 2018 Neutronics calculations for the ITER Collective Thomson Scattering Diagnostics Nonbøl, Erik; Klinkby, Esben Bryndt; Lauritzen, Bent; Santos, R. Publication
More informationAlkali Release from Typical Danish Aggregates to Potential ASR Reactive Concrete
Downloaded from orbit.dtu.dk on: Nov 30, 2018 Alkali Release from Typical Danish Aggregates to Potential ASR Reactive Concrete Thomsen, Hans Christian Brolin; Grelk, Bent; Barbosa, Ricardo Antonio; Hansen,
More informationThe colpitts oscillator family
Downloaded from orbit.dtu.dk on: Oct 17, 2018 The colpitts oscillator family Lindberg, Erik; Murali, K.; Tamasevicius, A. Publication date: 2008 Document Version Publisher's PDF, also known as Version
More informationA beam theory fracture mechanics approach for strength analysis of beams with a hole
A beam theory fracture mechanics approach for strength analysis of beams with a hole Danielsson, Henrik; Gustafsson, Per-Johan Published in: International Network on Timber Engineering Research - Proceedings
More informationUnknown input observer based scheme for detecting faults in a wind turbine converter Odgaard, Peter Fogh; Stoustrup, Jakob
Aalborg Universitet Unknown input observer based scheme for detecting faults in a wind turbine converter Odgaard, Peter Fogh; Stoustrup, Jakob Published in: Elsevier IFAC Publications / IFAC Proceedings
More informationSingle Shooting and ESDIRK Methods for adjoint-based optimization of an oil reservoir
Downloaded from orbit.dtu.dk on: Dec 2, 217 Single Shooting and ESDIRK Methods for adjoint-based optimization of an oil reservoir Capolei, Andrea; Völcker, Carsten; Frydendall, Jan; Jørgensen, John Bagterp
More informationBenchmarking of optimization methods for topology optimization problems
Downloaded from orbit.dtu.dk on: Feb, 18 Benchmarking of optimization methods for topology optimization problems Rojas Labanda, Susana; Stolpe, Mathias Publication date: 14 Document Version Peer reviewed
More informationExposure Buildup Factors for Heavy Metal Oxide Glass: A Radiation Shield
Downloaded from orbit.dtu.dk on: Jan 16, 2019 Exposure Buildup Factors for Heavy Metal Oxide Glass: A Radiation Shield Manonara, S. R.; Hanagodimath, S. M.; Gerward, Leif; Mittal, K. C. Published in: Journal
More informationSpace charge fields in DC cables
Downloaded from orbit.dtu.dk on: Sep 25, 2018 Space charge fields in DC cables McAllister, Iain Wilson; Crichton - Fratrådt, George C; Pedersen, Aage Published in: Conference Record of the IEEE International
More informationA detailed and verified wind resource atlas for Denmark
Downloaded from orbit.dtu.dk on: Dec 24, 2018 A detailed and verified wind resource atlas for Denmark Mortensen, Niels Gylling; Nielsen, P.; Landberg, Lars; Rathmann, Ole Steen; Nielsen, Morten Published
More informationOn numerical evaluation of two-dimensional phase integrals
Downloaded from orbit.dtu.dk on: Nov 28, 2018 On numerical evaluation of two-dimensional phase integrals Lessow, H.; Rusch, W.; Schjær-Jacobsen, Hans Published in: E E E Transactions on Antennas and Propagation
More informationExtreme sea levels and the assessment of future coastal flood risk
Downloaded from orbit.dtu.dk on: Dec 18, 2017 Extreme sea levels and the assessment of future coastal flood risk Nilsen, J. E. Ø. ; Sørensen, Carlo Sass; Dangendore, S. ; Andersson, H. ; Arns, A. ; Jensen,
More informationDesign possibilities for impact noise insulation in lightweight floors A parameter study
Downloaded from orbit.dtu.dk on: Dec 23, 218 Design possibilities for impact noise insulation in lightweight floors A parameter study Brunskog, Jonas; Hammer, Per Published in: Euronoise Publication date:
More informationField validation of the RIX performance indicator for flow in complex terrain
Downloaded from orbit.dtu.dk on: Sep 22, 2018 Field validation of the RIX performance indicator for flow in complex terrain Mortensen, Niels Gylling; Tindal, Andrew; Landberg, Lars Publication date: 2008
More informationAalborg Universitet. Land-use modelling by cellular automata Hansen, Henning Sten. Published in: NORDGI : Nordic Geographic Information
Aalborg Universitet Land-use modelling by cellular automata Hansen, Henning Sten Published in: NORDGI : Nordic Geographic Information Publication date: 2006 Document Version Publisher's PDF, also known
More informationRoom Allocation Optimisation at the Technical University of Denmark
Downloaded from orbit.dtu.dk on: Mar 13, 2018 Room Allocation Optimisation at the Technical University of Denmark Bagger, Niels-Christian Fink; Larsen, Jesper; Stidsen, Thomas Jacob Riis Published in:
More informationStudy of the atmospheric wake turbulence of a CFD actuator disc model
Downloaded from orbit.dtu.dk on: Apr 09, 2018 Study of the atmospheric wake turbulence of a CFD actuator disc model Réthoré, Pierre-Elouan; Sørensen, Niels N.; Bechmann, Andreas; Zahle, Frederik Published
More informationOn the Einstein-Stern model of rotational heat capacities
Downloaded from orbit.dtu.dk on: Jan 06, 2018 On the Einstein-Stern model of rotational heat capacities Dahl, Jens Peder Published in: Journal of Chemical Physics Link to article, DOI: 10.1063/1.77766
More informationDetermination of the minimum size of a statistical representative volume element from a fibre-reinforced composite based on point pattern statistics
Downloaded from orbit.dtu.dk on: Dec 04, 2018 Determination of the minimum size of a statistical representative volume element from a fibre-reinforced composite based on point pattern statistics Hansen,
More informationDevelopment of a Dainish infrastructure for spatial information (DAISI) Brande-Lavridsen, Hanne; Jensen, Bent Hulegaard
Aalborg Universitet Development of a Dainish infrastructure for spatial information (DAISI) Brande-Lavridsen, Hanne; Jensen, Bent Hulegaard Published in: NORDGI : Nordic Geographic Information Publication
More informationSolar radiation and thermal performance of solar collectors for Denmark
Downloaded from orbit.dtu.dk on: Feb 01, 2018 Solar radiation and thermal performance of solar collectors for Denmark Dragsted, Janne; Furbo, Simon Publication date: 2012 Document Version Publisher's PDF,
More informationGraphs with given diameter maximizing the spectral radius van Dam, Edwin
Tilburg University Graphs with given diameter maximizing the spectral radius van Dam, Edwin Published in: Linear Algebra and its Applications Publication date: 2007 Link to publication Citation for published
More informationMultiple Scenario Inversion of Reflection Seismic Prestack Data
Downloaded from orbit.dtu.dk on: Nov 28, 2018 Multiple Scenario Inversion of Reflection Seismic Prestack Data Hansen, Thomas Mejer; Cordua, Knud Skou; Mosegaard, Klaus Publication date: 2013 Document Version
More informationDynamic Asset Allocation - Identifying Regime Shifts in Financial Time Series to Build Robust Portfolios
Downloaded from orbit.dtu.dk on: Jan 22, 2019 Dynamic Asset Allocation - Identifying Regime Shifts in Financial Time Series to Build Robust Portfolios Nystrup, Peter Publication date: 2018 Document Version
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 informationResistivity survey at Stora Uppåkra, Sweden
Resistivity survey at Stora Uppåkra, Sweden Dahlin, Torleif Published in: Uppåkra - Centrum i analys och rapport 2001 Link to publication Citation for published version (APA): Dahlin, T. (2001). Resistivity
More informationVortex statistics for turbulence in a container with rigid boundaries Clercx, H.J.H.; Nielsen, A.H.
Vortex statistics for turbulence in a container with rigid boundaries Clercx, H.J.H.; Nielsen, A.H. Published in: Physical Review Letters DOI: 0.03/PhysRevLett.85.752 Published: 0/0/2000 Document Version
More informationPlane Wave Medical Ultrasound Imaging Using Adaptive Beamforming
Downloaded from orbit.dtu.dk on: Jul 14, 2018 Plane Wave Medical Ultrasound Imaging Using Adaptive Beamforming Voxen, Iben Holfort; Gran, Fredrik; Jensen, Jørgen Arendt Published in: Proceedings of 5th
More informationResistivity imaging for mapping of quick clays
Resistivity imaging for mapping of quick clays Dahlin, Torleif; Leroux, Virginie; Larsson, Rolf; Rankka, Karin 5 Link to publication Citation for published version (APA): Dahlin, T., Leroux, V., Larsson,
More informationDiffusion of sulfuric acid in protective organic coatings
Downloaded from orbit.dtu.dk on: Nov 03, 2018 Diffusion of sulfuric acid in protective organic coatings Wang, Ting; Møller, Victor Buhl; Dam-Johansen, Kim; Frankær, Sarah M.; Kiil, Søren Publication date:
More informationBattling Bluetongue and Schmallenberg virus Local scale behavior of transmitting vectors
Downloaded from orbit.dtu.dk on: Sep 10, 2018 Local scale behavior of transmitting vectors Stockmarr, Anders; Kirkeby, Carsten Thure; Bødker, Rene Publication date: 2015 Link back to DTU Orbit Citation
More informationRadiometric Measurements of Environmental Radioactivity Beta Counting, Alpha and Gamma Spectrometry
Downloaded from orbit.dtu.dk on: Jan 31, 2018 Radiometric Measurements of Environmental Radioactivity Beta Counting, Alpha and Gamma Spectrometry Nielsen, Sven Poul Publication date: 2013 Link back to
More informationCitation (APA): Holm, E., Frøsig, L., & Sidhu, R. (Eds.) (2006). Theory of sampling. (NKS-122).
Downloaded from orbit.dtu.dk on: Feb 12, 2018 Theory of sampling Holm, E.; Frøsig, Lars; Sidhu, R. Publication date: 2006 Document Version Publisher's PDF, also known as Version of record Link back to
More informationFeasibility of non-linear simulation for Field II using an angular spectrum approach
Downloaded from orbit.dtu.dk on: Aug 22, 218 Feasibility of non-linear simulation for using an angular spectrum approach Du, Yigang; Jensen, Jørgen Arendt Published in: 28 IEEE Ultrasonics Symposium Link
More informationStrongly 2-connected orientations of graphs
Downloaded from orbit.dtu.dk on: Jul 04, 2018 Strongly 2-connected orientations of graphs Thomassen, Carsten Published in: Journal of Combinatorial Theory. Series B Link to article, DOI: 10.1016/j.jctb.2014.07.004
More informationTectonic Thinking Beim, Anne; Bech-Danielsen, Claus; Bundgaard, Charlotte; Madsen, Ulrik Stylsvig
Aalborg Universitet Tectonic Thinking Beim, Anne; Bech-Danielsen, Claus; Bundgaard, Charlotte; Madsen, Ulrik Stylsvig Publication date: 2011 Document Version Early version, also known as pre-print Link
More informationAdvantages and Challenges of Superconducting Wind Turbine Generators
Downloaded from orbit.dtu.dk on: Apr 10, 2018 Advantages and Challenges of Superconducting Wind Turbine Generators Jensen, Bogi Bech; Mijatovic, Nenad; Abrahamsen, Asger Bech Publication date: 2012 Link
More informationOn a set of diophantine equations
On a set of diophantine equations Citation for published version (APA): van Lint, J. H. (1968). On a set of diophantine equations. (EUT report. WSK, Dept. of Mathematics and Computing Science; Vol. 68-WSK-03).
More informationResonant Inerter Based Absorbers for a Selected Global Mode
Downloaded from orbit.dtu.dk on: Jun 3, 208 Resonant Inerter Based Absorbers for a Selected Global Mode Krenk, Steen Published in: Proceedings of the 6th European Conference on Structural Control Publication
More informationA note on non-periodic tilings of the plane
A note on non-periodic tilings of the plane de Bruijn, N.G. Published: 01/01/1985 Document Version Publisher s PDF, also known as Version of Record (includes final page, issue and volume numbers) Please
More informationGIS Readiness Survey 2014 Schrøder, Anne Lise; Hvingel, Line Træholt; Hansen, Henning Sten; Skovdal, Jesper Høi
Aalborg Universitet GIS Readiness Survey 2014 Schrøder, Anne Lise; Hvingel, Line Træholt; Hansen, Henning Sten; Skovdal, Jesper Høi Published in: Geoforum Perspektiv DOI (link to publication from Publisher):
More information