The impact of wind direction yaw angle on cliff flows
Abstract
Abstract The behavior of flow close to a cliff at heights relevant to wind turbines is explored using observations and simulations from a field experiment conducted at the Wind Energy Institute of Canada Prince Edward Island field site. There are 4 wind turbines located approximately 100 m from a 12 m high cliff and a fifth turbine located 500 m inland. During the field experiment, ongoing mast‐based observations were supplemented with additional sonic anemometers and Doppler lidars. Consistent with wind tunnel measurements and previous model simulations, a small speedup in the flow (~3‐5%) at the turbine hub‐height (of 80 m) is observed when the flow is perpendicular to the cliff. The objective here is to determine the degree to which the magnitude of the speedup, or horizontal distance over which it is manifest, changes as the flow deviates from the perpendicular impingement angle (ie, for nonzero yaw angles). Results indicate that the zone of deceleration upwind of the cliff and the downwind acceleration zone are maintained with flow ±25° to the perpendicular. Further, there is little change in the relative magnitude of either the wind speed or the turbulence intensity with modest deviations from perpendicular flow. However, as the angle from the perpendicular increases (ie,more »
- Authors:
-
[1];
[2]
- Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca New York USA
- Department of Earth and Atmospheric Sciences Cornell University Ithaca New York USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1459230
- Grant/Contract Number:
- DE‐SC0016438
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Wind Energy
- Additional Journal Information:
- Journal Name: Wind Energy Journal Volume: 21 Journal Issue: 12; Journal ID: ISSN 1095-4244
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Barthelmie, R. J., and Pryor, S. C. The impact of wind direction yaw angle on cliff flows. United Kingdom: N. p., 2018.
Web. doi:10.1002/we.2227.
Barthelmie, R. J., & Pryor, S. C. The impact of wind direction yaw angle on cliff flows. United Kingdom. https://doi.org/10.1002/we.2227
Barthelmie, R. J., and Pryor, S. C. Fri .
"The impact of wind direction yaw angle on cliff flows". United Kingdom. https://doi.org/10.1002/we.2227.
@article{osti_1459230,
title = {The impact of wind direction yaw angle on cliff flows},
author = {Barthelmie, R. J. and Pryor, S. C.},
abstractNote = {Abstract The behavior of flow close to a cliff at heights relevant to wind turbines is explored using observations and simulations from a field experiment conducted at the Wind Energy Institute of Canada Prince Edward Island field site. There are 4 wind turbines located approximately 100 m from a 12 m high cliff and a fifth turbine located 500 m inland. During the field experiment, ongoing mast‐based observations were supplemented with additional sonic anemometers and Doppler lidars. Consistent with wind tunnel measurements and previous model simulations, a small speedup in the flow (~3‐5%) at the turbine hub‐height (of 80 m) is observed when the flow is perpendicular to the cliff. The objective here is to determine the degree to which the magnitude of the speedup, or horizontal distance over which it is manifest, changes as the flow deviates from the perpendicular impingement angle (ie, for nonzero yaw angles). Results indicate that the zone of deceleration upwind of the cliff and the downwind acceleration zone are maintained with flow ±25° to the perpendicular. Further, there is little change in the relative magnitude of either the wind speed or the turbulence intensity with modest deviations from perpendicular flow. However, as the angle from the perpendicular increases (ie, flow becomes increasingly parallel to the coast), the impact on wind speed and turbulence intensity decreases and is manifest over narrow and spatially less coherent regions.},
doi = {10.1002/we.2227},
journal = {Wind Energy},
number = 12,
volume = 21,
place = {United Kingdom},
year = {Fri Jul 06 00:00:00 EDT 2018},
month = {Fri Jul 06 00:00:00 EDT 2018}
}
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https://doi.org/10.1002/we.2227
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Works referenced in this record:
Variations of the Wake Height over the Bolund Escarpment Measured by a Scanning Lidar
journal, November 2015
- Lange, Julia; Mann, Jakob; Angelou, Nikolas
- Boundary-Layer Meteorology, Vol. 159, Issue 1
Airflow over a two-dimensional escarpment. II: Hydrostatic flow
journal, January 1990
- Pitts, R. O.; Lyons, T. J.
- Quarterly Journal of the Royal Meteorological Society, Vol. 116, Issue 492
Siting wind turbines near cliffs-the effect of wind direction: Siting Wind Turbines near Cliffs - the Effect of Wind Direction
journal, September 2015
- Rowcroft, J.; Burton, D.; Blackburn, H. M.
- Wind Energy, Vol. 19, Issue 8
Turbulent boundary layers over smooth and rough forward-facing steps
journal, April 2011
- Ren, Huiying; Wu, Yanhua
- Physics of Fluids, Vol. 23, Issue 4
Modification of air flow over an escarpment ? Results from the Hjardem�l experiment
journal, April 1995
- Emeis, Stefan; Frank, Helmut P.; Fiedler, Franz
- Boundary-Layer Meteorology, Vol. 74, Issue 1-2
Study of Atmospheric Boundary Layer Flows over a Coastal Cliff
journal, January 2005
- Gasset, Nicolas; Poitras, Gérard J.; Gagnon, Yves
- Wind Engineering, Vol. 29, Issue 1
An experimental investigation of the recirculation zone formed downstream of a forward facing step
journal, December 2010
- Sherry, M.; Lo Jacono, D.; Sheridan, J.
- Journal of Wind Engineering and Industrial Aerodynamics, Vol. 98, Issue 12
Computation of wind flow over topography
journal, August 1993
- Paterson, D. A.; Holmes, J. D.
- Journal of Wind Engineering and Industrial Aerodynamics, Vol. 46-47
Measurements of topographic multipliers and flow separation from a steep escarpment. Part I. Full scale measurements
journal, July 1997
- Holmes, J. D.; Banks, R. W.; Paevere, P.
- Journal of Wind Engineering and Industrial Aerodynamics, Vol. 69-71
Effects of an escarpment on flow parameters of relevance to wind turbines: Flow over an escarpment at turbine relevant heights
journal, March 2016
- Barthelmie, R. J.; Wang, H.; Doubrawa, P.
- Wind Energy, Vol. 19, Issue 12
A wind-tunnel investigation of the wind speed and turbulence characteristics close to the ground over various escarpment shapes
journal, October 1977
- Bowen, A. J.; Lindley, D.
- Boundary-Layer Meteorology, Vol. 12, Issue 3
The determination of topographical exposure factors for railway embankments
journal, August 1985
- Baker, C. J.
- Journal of Wind Engineering and Industrial Aerodynamics, Vol. 21, Issue 1
Numerical studies of neutrally stratified planetary boundary-layer flow above gentle topography: I: Two-dimensional cases
journal, August 1977
- Taylor, P. A.
- Boundary-Layer Meteorology, Vol. 12, Issue 1
Experimental and Numerical Modelling of Flow over Complex Terrain: The Bolund Hill
journal, September 2015
- Conan, Boris; Chaudhari, Ashvinkumar; Aubrun, Sandrine
- Boundary-Layer Meteorology, Vol. 158, Issue 2
Effect of Reynolds number and inflow parameters on mean and turbulent flow over complex topography
journal, January 2016
- Kilpatrick, Ryan; Hangan, Horia; Siddiqui, Kamran
- Wind Energy Science, Vol. 1, Issue 2
For wind turbines in complex terrain, the devil is in the detail
journal, September 2017
- Lange, Julia; Mann, Jakob; Berg, Jacob
- Environmental Research Letters, Vol. 12, Issue 9
Sea cliffs: Their processes, profiles, and classification
journal, January 1982
- Emery, K. O.; Kuhn, G. G.
- Geological Society of America Bulletin, Vol. 93, Issue 7