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Title:
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Large off-shore windfarms : linking wake models with atmospheric boundary layer models
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Author(s):
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Schepers, J.G.; Barthelmie, R.; Kostas, K.; Lange, B.; Schlez, W.
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Published by:
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Publication date:
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ECN
Wind Energy
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1-3-2002
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ECN report number:
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Document type:
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ECN-RX--02-007
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Conference Paper
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Number of pages:
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Full text:
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9
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Download PDF
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Presented at: Off-shore wakes, measurements and modelling, Roskilde, Denmark, 7-8 maart 2002.
Abstract:
One of the main objectives of the EU-5th Framework project ENDOW (EfficientDevelopment of Off-Shore Wind Farms) is to develop a design tool, which
calculates the power production of a large off-shore wind farm. This
design tool will consist of an atmospheric model coupled with a wake
model. An atmospheric model is meant to calculate the free flow in off-shore
conditions, taking into account terrain and meteorological effects,
but usually no wind turbines and resulting wake effects are included.
The wake model is then meant to fill this gap, i.e it calculates the
disturbance from a wind turbine on the initial flow, where meteorological
and terrain effects are usually not included in the principal wake calculations.
Some wake models assume that the outer atmospheric flow remains constant
over the farm and as a consequence the flow at infinity returns to the
initial flow field again. Other wake models calculate a wake deficit
under the assumption of a constant outer flow, and superimpose this
wake deficit on a (possibly) varying outer flow.
Within the ENDOW project various candidate atmospheric and wake models
are available to be incorporated into the design tool. In order to gain
insight into the suitability of the various models and in the way how
they can be linked, a questionnaire has been distributed between the
various modelling partners. Using the response on the questionnaire
an inventory of the different models has been made with emphasis on
the items which determine the compatibility of the different models.
Aspects, which are of importance for this compatibility are consistancy
from a physical point of view, but also consistancy from an informatic
point of view (i.e. input/output, platform, compiler etc.).
In the paper the first results from the questionnaire are summarized.
Thereto Section 2 gives a brief description of the questionnaire. This
is followed by section 3 and 4, in which the response on the wake and
the atmospherice models is summarized. In section 5 some first ideas
on the interfacing are proposed. It must be noted that the present inventory
is very preliminary:
Many answers on the questionnaire are still lacking and the paper is
mainly intended to serve as food for discussion within the project group.
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