Study of the Distribution Characteristics of the Airflow Field in Tree Canopies Based on the CFD Model

Article Construction & Building Technology

Numerical simulation of the effects of canopy properties on airflow and pollutant dispersion in street canyons

Le Wang et al.

Summary: The position of the tree canopy directly affects the airflow form and velocity distribution in the street canyon, while the uniform/random distribution of leaves has minimal impact on pollutant concentration fields.

INDOOR AND BUILT ENVIRONMENT (2022)

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Article Agriculture, Multidisciplinary

Numerical simulation of downwash airflow distribution inside tree canopies of an apple orchard from a multirotor unmanned aerial vehicle (UAV) sprayer

Hao Zhang et al.

Summary: This study developed a CFD model to predict downwash airflow inside tree canopies and validated the model through experiments. The results showed that airflow velocity inside tree canopies is influenced by multiple factors. This research provides important references for the application of UAV sprayers in orchards.

COMPUTERS AND ELECTRONICS IN AGRICULTURE (2022)

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Article Chemistry, Multidisciplinary

Research on Droplets Deposition Characteristics of Anti-Drift Spray Device with Multi-Airflow Synergy Based on CFD Simulation

Guiju Fan et al.

Summary: This paper presents a V-shaped anti-drift spray device with multi-airflow synergy to improve droplet deposition in the canopy of fruit trees. A droplet spatial motion model and an anti-drift mechanism based on particle dynamics analysis were constructed. The influences of spray pressure and V-shaped wind speed on droplet movement were investigated, and a simulation model of the flow field between the spray device and the fruit trees canopy was established using computational fluid mechanics (CFD). The results showed significant impact of the factors on droplet deposition characteristics, with V-shaped wind speed having the highest influence. The anti-drift experiments demonstrated the effectiveness of the device.

APPLIED SCIENCES-BASEL (2022)

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Article Agriculture, Multidisciplinary

Cotton canopy airflow simulation and velocity attenuation model based upon 3D phenotype and stratified sub-regional porous medium

Huiyuan Cui et al.

Summary: In this study, a digital method utilizing computational fluid dynamics (CFD) and machine-learning (ML) methods is proposed to predict airflow distribution in a dense crop canopy. By generating a virtual 3D cotton plant and using a stratified sub-regional porous medium model, ML algorithms are trained under different spray operating parameters to achieve accurate airflow prediction. This data-driven model can optimize operational parameters and eliminate complex CFD simulations or tedious physical experiments.

COMPUTERS AND ELECTRONICS IN AGRICULTURE (2022)

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Article Agronomy

Analysing Airflow Velocity in the Canopy to Improve Droplet Deposition for Air-Assisted Spraying: A Case Study on Pears

Rongkai Shi et al.

Summary: This study explores the variations in airflow attenuation in the inner canopy using pear trees as an example. It determines a suitable inner canopy airflow end velocity (ICAEV) for air-assisted application by examining mist droplet formation, and validates the findings in the field.

AGRONOMY-BASEL (2022)

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Article Thermodynamics

CFD modelling: The most useful tool for developing mesoscale urban canopy parameterizations

Riccardo Buccolieri et al.

BUILDING SIMULATION (2021)

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Article Agronomy

The Airflow Field Characteristics of the Unmanned Agricultural Aerial System on Oilseed Rape (Brassica napus) Canopy for Supplementary Pollination

Songchao Zhang et al.

Summary: The study conducted experiments in an oilseed rape field using an unmanned agricultural aerial system (UAAS) to investigate the effects of flight speed (FS) and flight height (FH) on airflow velocities (vx, vy, vz). The results showed significant impacts of FS and FH on airflow velocities, with confirmed pollen spread effectiveness of the UAAS airflow field, supported by high-speed dynamic camera technology and pollen samples collected during the experiments.

AGRONOMY-BASEL (2021)

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Review Agriculture, Multidisciplinary