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Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (1): 215-228.DOI: 10.7522/j.issn.1000-694X.2024.00156

Previous Articles    

Application and validation of the varied porosity model in simulating sand-grown flexible plant

Jialiang Sun(), Ning Huang, Yuhao Zhao, Binbin Pei, Jie Zhang()   

  1. MOE Key Laboratory of Mechanics on Disaster and Environment in Western China / College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China
  • Received:2024-10-08 Revised:2024-11-18 Online:2025-01-20 Published:2025-01-13
  • Contact: Jie Zhang

Abstract:

The swaying effects of flexible plants under turbulent flow conditions can affect their wind erosion control effectiveness. This study develops a varied porosity model based on the traditional porous media model to describe the flexural movement of plants, and parameterizes plant flexibility to improve the accuracy of wind erosion control engineering design. Large eddy simulation (LES) is conducted to analyze the impact of plants with different oscillation frequencies and amplitudes on canopy flow characteristics.Results show that flexible plants exhibit lower mean velocities within the canopy and in the near-wake region, but higher fluctuating velocities and turbulent kinetic energy. The surface shear stress around flexible plants are also smaller, providing better sheltering effects in the wake region. Highly flexible plants form turbulent zones at the top of the canopy and generate strong gusts in the near-wake region on the leeward side, partially reducing the protective effect in this area.

Key words: flexible vegetation, porous media model, turbulence structure, windbreak efficiency, wind profile

CLC Number: