Effects of a forest clearing: An experimental and numerical assessment

Tetsuya Nakamura; Koji Fukagata; Antonio Segalini; P. Henrik Alfredsson

Effects of a forest clearing: An experimental and numerical assessment

Tetsuya Nakamura, Koji Fukagata, Antonio Segalini, P. Henrik Alfredsson

Department of Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The flow above a forest model with and without the presence of a clearing is investigated experimentally in a wind tunnel facility by means of Particle Image Velocimetry. The results have been analyzed in terms of basic velocity statistics and vertical integral length scale and a comparison of the two geometries is presented. In order to improve the current flow understanding and to complement the experimental results, Large Eddy Simulations of the same flows under similar operating conditions are planned. The experimental results indicate that the clearing is associated to a velocity defect in the mean velocity profile associated with a significant vertical momentum flux. The turbulence is redistributed amongst the various velocity components so that the streamwise velocity variance is reduced while the vertical velocity variance is enhanced. From the clearing windward edge the turbulence mixing contributes to the decrease of the vertical correlation length that increases again after the clearing trailing edge.

Original language	English
Title of host publication	International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Publisher	TSFP-8
Volume	1
ISBN (Electronic)	9780000000002
Publication status	Published - 2013 Jan 1
Event	8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 - Poitiers, France Duration: 2013 Aug 28 → 2013 Aug 30

Other

Other	8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Country	France
City	Poitiers
Period	13/8/28 → 13/8/30

ASJC Scopus subject areas

Fluid Flow and Transfer Processes

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Nakamura, T., Fukagata, K., Segalini, A., & Alfredsson, P. H. (2013). Effects of a forest clearing: An experimental and numerical assessment. In International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 (Vol. 1). TSFP-8.

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abstract = "The flow above a forest model with and without the presence of a clearing is investigated experimentally in a wind tunnel facility by means of Particle Image Velocimetry. The results have been analyzed in terms of basic velocity statistics and vertical integral length scale and a comparison of the two geometries is presented. In order to improve the current flow understanding and to complement the experimental results, Large Eddy Simulations of the same flows under similar operating conditions are planned. The experimental results indicate that the clearing is associated to a velocity defect in the mean velocity profile associated with a significant vertical momentum flux. The turbulence is redistributed amongst the various velocity components so that the streamwise velocity variance is reduced while the vertical velocity variance is enhanced. From the clearing windward edge the turbulence mixing contributes to the decrease of the vertical correlation length that increases again after the clearing trailing edge.",

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AU - Alfredsson, P. Henrik

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N2 - The flow above a forest model with and without the presence of a clearing is investigated experimentally in a wind tunnel facility by means of Particle Image Velocimetry. The results have been analyzed in terms of basic velocity statistics and vertical integral length scale and a comparison of the two geometries is presented. In order to improve the current flow understanding and to complement the experimental results, Large Eddy Simulations of the same flows under similar operating conditions are planned. The experimental results indicate that the clearing is associated to a velocity defect in the mean velocity profile associated with a significant vertical momentum flux. The turbulence is redistributed amongst the various velocity components so that the streamwise velocity variance is reduced while the vertical velocity variance is enhanced. From the clearing windward edge the turbulence mixing contributes to the decrease of the vertical correlation length that increases again after the clearing trailing edge.

AB - The flow above a forest model with and without the presence of a clearing is investigated experimentally in a wind tunnel facility by means of Particle Image Velocimetry. The results have been analyzed in terms of basic velocity statistics and vertical integral length scale and a comparison of the two geometries is presented. In order to improve the current flow understanding and to complement the experimental results, Large Eddy Simulations of the same flows under similar operating conditions are planned. The experimental results indicate that the clearing is associated to a velocity defect in the mean velocity profile associated with a significant vertical momentum flux. The turbulence is redistributed amongst the various velocity components so that the streamwise velocity variance is reduced while the vertical velocity variance is enhanced. From the clearing windward edge the turbulence mixing contributes to the decrease of the vertical correlation length that increases again after the clearing trailing edge.

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