The fence experiment – full-scale lidar-based shelter observations

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Abstract

We present shelter measurements of a fence from a field experiment in Denmark. The measurements
were performed with three lidars scanning on a vertical plane downwind of the fence. Inflow conditions are based
on sonic anemometer observations of a nearby mast. For fence-undisturbed conditions, the lidars’ measurements
agree well with those from the sonic anemometers and, at the mast position, the average inflow conditions are
well described by the logarithmic profile. Seven cases are defined based on the relative wind direction to the fence, the fence porosity, and the inflow conditions. The larger the relative direction, the lower the effect of the shelter. For the case with the largest relative directions, no sheltering effect is observed in the far wake (distances ' 6 fence heights downwind of the fence). When comparing a near-neutral to a stable case, a stronger shelter effect is noticed. The shelter is highest below ≈ 1.46 fence heights and can sometimes be observed at all downwind positions (up to 11 fence heights downwind). Below the fence height, the porous fence has a lower impact on the flow close to the fence compared to the solid fence. Velocity profiles in the far wake converge onto each other using the self-preserving forms from two-dimensional wake analysis.
Original languageEnglish
JournalWind Energy Science
Volume1
Issue number2
Pages (from-to)101-114
Number of pages14
ISSN2366-7443
DOIs
Publication statusPublished - 2016

Cite this

@article{0b91f98cdb7a4a1f95305be58bc8985e,
title = "The fence experiment – full-scale lidar-based shelter observations",
abstract = "We present shelter measurements of a fence from a field experiment in Denmark. The measurementswere performed with three lidars scanning on a vertical plane downwind of the fence. Inflow conditions are basedon sonic anemometer observations of a nearby mast. For fence-undisturbed conditions, the lidars’ measurementsagree well with those from the sonic anemometers and, at the mast position, the average inflow conditions arewell described by the logarithmic profile. Seven cases are defined based on the relative wind direction to the fence, the fence porosity, and the inflow conditions. The larger the relative direction, the lower the effect of the shelter. For the case with the largest relative directions, no sheltering effect is observed in the far wake (distances ' 6 fence heights downwind of the fence). When comparing a near-neutral to a stable case, a stronger shelter effect is noticed. The shelter is highest below ≈ 1.46 fence heights and can sometimes be observed at all downwind positions (up to 11 fence heights downwind). Below the fence height, the porous fence has a lower impact on the flow close to the fence compared to the solid fence. Velocity profiles in the far wake converge onto each other using the self-preserving forms from two-dimensional wake analysis.",
author = "{Pena Diaz}, Alfredo and Andreas Bechmann and Davide Conti and Nikolas Angelou",
year = "2016",
doi = "10.5194/wes-1-101-2016",
language = "English",
volume = "1",
pages = "101--114",
journal = "Wind Energy Science",
issn = "2366-7443",
publisher = "Copernicus GmbH",
number = "2",

}

The fence experiment – full-scale lidar-based shelter observations. / Pena Diaz, Alfredo; Bechmann, Andreas; Conti, Davide; Angelou, Nikolas.

In: Wind Energy Science, Vol. 1, No. 2, 2016, p. 101-114.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The fence experiment – full-scale lidar-based shelter observations

AU - Pena Diaz, Alfredo

AU - Bechmann, Andreas

AU - Conti, Davide

AU - Angelou, Nikolas

PY - 2016

Y1 - 2016

N2 - We present shelter measurements of a fence from a field experiment in Denmark. The measurementswere performed with three lidars scanning on a vertical plane downwind of the fence. Inflow conditions are basedon sonic anemometer observations of a nearby mast. For fence-undisturbed conditions, the lidars’ measurementsagree well with those from the sonic anemometers and, at the mast position, the average inflow conditions arewell described by the logarithmic profile. Seven cases are defined based on the relative wind direction to the fence, the fence porosity, and the inflow conditions. The larger the relative direction, the lower the effect of the shelter. For the case with the largest relative directions, no sheltering effect is observed in the far wake (distances ' 6 fence heights downwind of the fence). When comparing a near-neutral to a stable case, a stronger shelter effect is noticed. The shelter is highest below ≈ 1.46 fence heights and can sometimes be observed at all downwind positions (up to 11 fence heights downwind). Below the fence height, the porous fence has a lower impact on the flow close to the fence compared to the solid fence. Velocity profiles in the far wake converge onto each other using the self-preserving forms from two-dimensional wake analysis.

AB - We present shelter measurements of a fence from a field experiment in Denmark. The measurementswere performed with three lidars scanning on a vertical plane downwind of the fence. Inflow conditions are basedon sonic anemometer observations of a nearby mast. For fence-undisturbed conditions, the lidars’ measurementsagree well with those from the sonic anemometers and, at the mast position, the average inflow conditions arewell described by the logarithmic profile. Seven cases are defined based on the relative wind direction to the fence, the fence porosity, and the inflow conditions. The larger the relative direction, the lower the effect of the shelter. For the case with the largest relative directions, no sheltering effect is observed in the far wake (distances ' 6 fence heights downwind of the fence). When comparing a near-neutral to a stable case, a stronger shelter effect is noticed. The shelter is highest below ≈ 1.46 fence heights and can sometimes be observed at all downwind positions (up to 11 fence heights downwind). Below the fence height, the porous fence has a lower impact on the flow close to the fence compared to the solid fence. Velocity profiles in the far wake converge onto each other using the self-preserving forms from two-dimensional wake analysis.

U2 - 10.5194/wes-1-101-2016

DO - 10.5194/wes-1-101-2016

M3 - Journal article

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SP - 101

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JO - Wind Energy Science

JF - Wind Energy Science

SN - 2366-7443

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ER -