ITEM METADATA RECORD
Title: CFD modelling and wind tunnel validation of airflow through plant canopies using 3D canopy architecture
Authors: Melese, Ayenew ×
Hertog, Maarten
Baetens, K
Delele, Mulugeta Admasu
Persoons, Tim
Baelmans, Martine
Ramon, Herman
Nicolai, Bart
Verboven, Pieter #
Issue Date: Apr-2009
Publisher: Mechanical Engineering Publications
Series Title: International journal of heat and fluid flow vol:30 issue:2 pages:356-368
Abstract: The efficiency of pesticide application to agricultural fields and the resulting environmental contamination highly depend on atmospheric airflow. A computational fluid dynamics (CFD) modelling of airflow within plant canopies using 3D canopy architecture was developed to understand the effect of the canopy to airflow. The model average air velocity was validated using experimental results in a wind tunnel with two artificial model trees of 24 cm height. Mean air velocities and their root mean square (RMS) values were measured on a vertical plane upstream and downstream sides of the trees in the tunnel using 2D hotwire anemometer after imposing a uniform air velocity of 10 m s(-1) at the inlet. 3D virtual canopy geometries of the artificial trees were modelled and introduced into a computational fluid domain whereby airflow through the trees was simulated using Reynolds-Averaged Navier-Stokes (RANS) equations and k-epsilon turbulence model. There was good agreement of the average longitudinal velocity, U between the measurements and the simulation results with relative errors less than 2% for upstream and 8% for downstream sides of the trees. The accuracy of the model prediction for turbulence kinetic energy k and turbulence intensity I was acceptable within the tree height when using a roughness length (y(0) = 0.02 mm) for the surface roughness of the tree branches and by applying a source model in a porous sub-domain created around the trees. The approach was applied for full scale orchard trees in the atmospheric boundary layer (ABL) and was compared with previous approaches and works. The simulation in the ABL was made using two groups of full scale orchard trees; short (h = 3 m) with wider branching and long (h = 4 m) with narrow branching. This comparison showed good qualitative agreements on the vertical profiles of U with small local differences as expected due to the spatial disparities in tree architecture. This work was able to show airflow within and above the canopy in 3D in more details. (C) 2008 Elsevier Inc. All rights reserved.
URI: 
ISSN: 0142-727X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Mechatronics, Biostatistics and Sensors (MeBioS)
Applied Mechanics and Energy Conversion Section
× corresponding author
# (joint) last author

Files in This Item:
File Description Status SizeFormat
wind tunnel.pdf Published 990KbAdobe PDFView/Open Request a copy

These files are only available to some KU Leuven Association staff members

 




All items in Lirias are protected by copyright, with all rights reserved.

© Web of science