Large-Eddy Simulation of Erosion and Deposition over Multiple Two-Dimensional Gaussian Hills in a Turbulent Boundary Layer

Huang, G.; Ribault, Catherine; Vinkovic, Ivana; Simoëns, Serge

doi:10.1007/s10546-019-00463-2

Cited by 4 publications

(19 citation statements)

References 54 publications

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“…To evaluate the impact of recirculation zones generated by obstacles on the solid particle mass flux, experiments were performed around one or a set of two 2D Gaussian hills with different spacings by Simoëns et al (2015). G. Huang et al (2018Huang et al ( , 2019 conducted LES of the related cases and compared the results to the experiments by Simoëns et al (2015). Such LES applications were possible as no a priori mean friction velocity nor global laws depending on friction velocity on flat terrains, were included in the modeling.…”

Section: 1029/2020jd034461 2 Of 36mentioning

confidence: 99%

“…To evaluate the aerodynamic entrainment rate, G. Huang et al (2018Huang et al ( , 2019 developed a new take-off criterion based on the instantaneous evaluation of the different forces exerted on the particle. G. Huang et al (2019) assumed that take-off occurs when the impulse of the forces acting on the particle (the gravity, the cohesion and the lift forces) at the ground is large enough to disrupt the local equilibrium. Since turbulent structures play a crucial role in the initiation of particle motion (G. Huang et al, 2019;Schmeeckle et al, 2007;Sumer et al, 2003) particle lift is related to strong turbulent sweeps.…”

Section: Particle-bed Interactionsmentioning

confidence: 99%

“…G. Huang et al (2019) assumed that take-off occurs when the impulse of the forces acting on the particle (the gravity, the cohesion and the lift forces) at the ground is large enough to disrupt the local equilibrium. Since turbulent structures play a crucial role in the initiation of particle motion (G. Huang et al, 2019;Schmeeckle et al, 2007;Sumer et al, 2003) particle lift is related to strong turbulent sweeps. Contrary to the hill simulations by G. Huang et al (2019), the present work simulations are performed over a fixed smooth wall.…”

Section: Particle-bed Interactionsmentioning

confidence: 99%

“…Building obstacles is also a widely employed method for stopping or reducing desert progression (Xu et al., 2018). Numerical simulations have widely been used to study natural erodible zones in turbulent boundary layers or above hills (Dupont et al., 2013; G. Huang, 2015; G. Huang et al., 2018, 2019). These simulations can provide detailed information about the evolution of solid particle mass fluxes and help to predict accumulation and erosion zones in a given configuration at different scales.…”

Section: Introductionmentioning

confidence: 99%

“…G. Huang et al. (2018, 2019) conducted LES of the related cases and compared the results to the experiments by Simoëns et al. (2015).…”

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer

2021

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The prediction of solid particle transport, deposition, and emission around one or more obstacles, disposed at the ground, is an important issue for cities in the proximity of deserts or in semi-arid regions. Building obstacles is also a widely employed method for stopping or reducing desert progression (Xu et al., 2018). Numerical simulations have widely been used to study natural erodible zones in turbulent boundary layers or above hills (

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Section: 1029/2020jd034461 2 Of 36mentioning

confidence: 99%

Section: Particle-bed Interactionsmentioning

confidence: 99%

Section: Particle-bed Interactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…G. Huang et al. (2018, 2019) conducted LES of the related cases and compared the results to the experiments by Simoëns et al. (2015).…”

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer

2021

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Large eddy simulation of particle transport and deposition over multiple 2D square obstacles in a turbulent boundary layer

Ribault

Vinkovic²,

SIMOENS

2020

Preprint

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Predicting solid particle transport in the lowest parts of the atmosphere is a major issue for man-made obstacles in semi-arid regions. Here, we investigate the effects on solid particle saltation, of square obstacles on the ground with different spacings. The aerodynamic field is determined by large eddy simulations coupled with an immersed boundary method for the obstacles. Solid particles are tracked by a Lagrangian approach. Takeoff and rebound models are introduced for the interaction of particles with the wall. Without particles, fluid velocity profiles are first compared with experiments (Simoens et al., 2007) showing good agreement. Special focus is put on the recirculation zone that plays an important role in solid particle entrapment.Particle concentration fields are presented. Accumulation zones are studied regarding the different obstacle spacings as an extension of the aerodynamic scheme by Oke (1988) to solid particle transport. A deposition peak appears before the first obstacle. When the spacing between the two obstacles is large enough, some particles are trapped within the recirculation and a second deposition peak arises. The streamwise evolution of the horizontal saltation flux shows that the lowest flux downstream of the obstacles is obtained for the highest separation. The deposition rate or the streamwise saltation flux are estimated globally as a function of obstacle spacing. These results illustrate how the numerical tool developed here can be used for assessing air quality in terms of solid particle concentration.

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On Conditions for the Wind Removal of Soil Particles

Malinovskaya

Chkhetiani

2021

J Appl Mech Tech Phy

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Large-Eddy Simulation of Erosion and Deposition over Multiple Two-Dimensional Gaussian Hills in a Turbulent Boundary Layer

Cited by 4 publications

References 54 publications

Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer

Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer

Large eddy simulation of particle transport and deposition over multiple 2D square obstacles in a turbulent boundary layer

On Conditions for the Wind Removal of Soil Particles

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