Influence of Gaussian Hill on Concentration of Solid Particles in Suspension Inside Turbulent Boudary Layer

Simoëns, Serge; Saleh, A.M.; Leribault, C.; Belhmadi, M.; Zegadi, R.; Allag, F.; Vignon, J. M.; Huang, G.

doi:10.1016/j.piutam.2015.06.015

Cited by 6 publications

(10 citation statements)

References 8 publications

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“…The vertical flow velocity, shown in Figure b, presents a strong updraft at the windward side of the hill and an extended downdraft region between 3 and 10 h beyond the hill. The modeled flow field around the hill and in particular the extension of the wake region are in good agreement with the wind tunnel studies by Simoëns et al (), carried out in flow regimes that satisfy the criterion for Reynolds number independence proposed by Cermak ().…”

Section: Resultssupporting

confidence: 86%

Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales

et al. 2019

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Preferential deposition of snow and dust over complex terrain is responsible for a wide range of environmental processes and accounts for a significant source of uncertainty in the surface mass balances of cold and arid regions. Despite the growing body of literature on the subject, previous studies reported contradictory results on the location and magnitude of deposition maxima and minima. This study aims at unraveling the governing processes of preferential deposition in a neutrally stable atmosphere and to reconcile seemingly inconsistent results of previous works. For this purpose, a comprehensive modeling approach is developed, based on large eddy simulations of the turbulent airflow, Lagrangian stochastic model of particle trajectories, and immersed boundary method to represent the underlying topography. The model is tested against wind tunnel measurements of dust deposition around isolated and sequential hills. A scale analysis is then performed to investigate the dependence of snowfall deposition on the particle Froude and Stokes numbers, which fully account for the governing processes of inertia, flow advection, and gravity. Model results suggest that different deposition patterns emerge from different combinations of dimensionless parameters, with deposition maxima located either on the windward or the leeward slope of the hill. Additional simulations are performed, to test whether the often used assumption of inertialess particles yields accurate deposition patterns. Results indicate that this assumption can be justified when snowflakes present dendritic shape but may generate unrealistic results for rounded particles. We finally show that our scale analysis provides qualitatively similar results for hills with different aspect ratios.

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Section: Resultssupporting

confidence: 86%

Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales

et al. 2019

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“…For the single hill configuration, a recirculation zone of approximatively 6H appears on the lee side of the hill. This is in agreement with the experimental results of Simoëns et al [2]. The flow evolution before the first hill is similar in the three cases.…”

Section: Shear Stress and Recirculation Zonessupporting

confidence: 93%

“…The simulation results are compared to the PC09 experiments of Simoëns et al [2]. The flow between and behind Gaussian hills is dominated by large recirculation zones.…”

Section: Discussionmentioning

confidence: 99%

“…To this purpose, an experimental campaign was conducted in the frame of the NFS/ANR Sino-French program PEDO-COTESOF "Particle EMission and Deposition Over Complex Terrain for Soil Fixation (PC09). Particle dispersion over one or two hills was investigated [2]. At our best knowledge, this is the only experimental case that produces both aerodynamic description, recirculation zones and solid particle concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Then, LES velocity and concentration profiles are compared to the experiments on solid particle dispersion downstream of Gaussian hills, by Simoëns et al [2]. Special attention is given to the trapping of solid particles inside the recirculation bubbles.…”

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confidence: 99%

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Large Eddy Simulation of Saltation Over Gaussian Hills

Huang¹,

Ribault²,

Simoëns³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. Soil erosion plays an important role for climate, health and environmental issues. In this study, we focus on the transport of solid particles over a dry rough bed and their interaction with Gaussian hills. For this aim, we use large-eddy simulations (LES) performed with the atmospheric code ARPS. To follow the trajectories of the solid particles, a Lagrangian model is coupled with the LES, according to Vinkovic [1]. Different empirical models have been developed to take into account the interactions of particles with the rough bed, especially the takeoff, the rebound and the deposition.A rough boundary layer at different external velocities is first simulated. The solid particle mass flux as function of the friction velocity is plotted and compared to classical analytical and empirical results in the Shields diagram.Then, LES velocity and concentration profiles are compared to the experiments on solid particle dispersion downstream of Gaussian hills, by Simoëns et al. [2]. Special attention is given to the trapping of solid particles inside the recirculation bubbles. Regions of high particle deposition or erosion are identified. The influence of the distance between two consecutive hills is evaluated. 7074

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

Huang¹,

Ribault²,

Vinkovic³

et al. 2019

Boundary-Layer Meteorol

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Influence of Gaussian Hill on Concentration of Solid Particles in Suspension Inside Turbulent Boudary Layer

Cited by 6 publications

References 8 publications

Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales

Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales

Large Eddy Simulation of Saltation Over Gaussian Hills

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

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