### 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 |
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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 |
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Country | France |

City | Poitiers |

Period | 13/8/28 → 13/8/30 |

### Fingerprint

### ASJC Scopus subject areas

- Fluid Flow and Transfer Processes

### Cite this

*International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013*(Vol. 1). TSFP-8.

**Effects of a forest clearing : An experimental and numerical assessment.** / Nakamura, Tetsuya; Fukagata, Koji; Segalini, Antonio; Alfredsson, P. Henrik.

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

*International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013.*vol. 1, TSFP-8, 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, Poitiers, France, 13/8/28.

}

TY - GEN

T1 - Effects of a forest clearing

T2 - An experimental and numerical assessment

AU - Nakamura, Tetsuya

AU - Fukagata, Koji

AU - Segalini, Antonio

AU - Alfredsson, P. Henrik

PY - 2013/1/1

Y1 - 2013/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=85034064565&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85034064565&partnerID=8YFLogxK

M3 - Conference contribution

VL - 1

BT - International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013

PB - TSFP-8

ER -