Wind erosion of sand placed inside a rectangular box

Ferreira, Almerindo D.; Oliveira, Rui André

doi:10.1016/j.jweia.2008.09.001

Cited by 10 publications

(8 citation statements)

References 14 publications

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“…It has been applied in many fields including process engineering, mining, and Geomechanics. It is also recognized as an effective method for the study of the fundamental behaviour of granular materials [1,2].…”

Section: Discrete Element Methods (Dem)mentioning

confidence: 99%

“…Several researchers have developed a multitude of techniques and methodologies to analyse the wind flow around the piles of open storage yards [1][2][3]. Computational Fluid Dynamic has largely implemented in the succeeding works to study the surrounding wind flow implications for the Aeolian particle transport in case of dune erosion [4].…”

Section: Introductionmentioning

confidence: 99%

“…Farimani et al studied the dispersion of pollutants and dust release either from transportation or storage yards. Also some experiments and CFD simulations performed to investigate the role of saltation and creep module on the deformation and erosion rate of a sand pile [1,5].…”

Section: Introductionmentioning

confidence: 99%

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Dust emission modelling around a stockpile by using computational fluid dynamics and discrete element method

Derakhshani¹,

Schott²,

Lodewijks³

2013

AIP Conference Proceedings

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Abstract. Dust emissions can have significant effects on the human health, environment and industry equipment. Understanding the dust generation process helps to select a suitable dust preventing approach and also is useful to evaluate the environmental impact of dust emission. To describe these processes, numerical methods such as Computational Fluid Dynamics (CFD) are widely used, however nowadays particle based methods like Discrete Element Method (DEM) allow researchers to model interaction between particles and fluid flow. In this study, air flow over a stockpile, dust emission, erosion and surface deformation of granular material in the form of stockpile are studied by using DEM and CFD as a coupled method. Two and three dimensional simulations are respectively developed for CFD and DEM methods to minimize CPU time. The standard -turbulence model is used in a fully developed turbulent flow. The continuous gas phase and the discrete particle phase link to each other through gas-particle void fractions and momentum transfer. In addition to stockpile deformation, dust dispersion is studied and finally the accuracy of stockpile deformation results obtained by CFD-DEM modelling will be validated by the agreement with the existing experimental data.

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Section: Discrete Element Methods (Dem)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dust emission modelling around a stockpile by using computational fluid dynamics and discrete element method

Derakhshani¹,

Schott²,

Lodewijks³

2013

AIP Conference Proceedings

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“…Recent work by Ferreira and Oliveira [8] reported experimental data for surface changes for sand contained in a rectangular box and exposed to air flow; these results present a clear correlation between recirculation zones and surface contour changes.…”

Section: Introductionmentioning

confidence: 93%

Numerical and experimental analysis of wind erosion on a sinusoidal pile

2010

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Erosion is a common phenomenon in nature, and it may cause a wide range of problems such as air pollution, and destruction of agricultural land, shelters and stockpiles. The present work deals with stockpiles, which have their profiles described by a sinus function or by similar trigonometric functions. Analysis of the erosion by air flow over these piles will provide for further understanding of the erosion underlying mechanisms and, moreover, how to control them and eventually to prevent them. To this purpose, different experimental tests are conducted for a pile with a sinuous profile, and particular attention is given to the time development of the profile due to the erosion process; the effect of the air velocity is also studied by selecting different velocities. In addition, the flow over several deformed piles is numerically predicted using the CFX software; the results clearly show the erosion process is strongly dependent upon time, velocity field and surface disturbances. A correlation between the erosion rate and the velocity is proposed.

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“…The measured boundary layer thickness is δ = 0.4 m, almost four times the height of the pile model; the exponent was evaluated as α = 0.11 [16]. Due to the model scale adopted in this work, and because of the ratio between the pile height and the thickness of the wind tunnel boundary layer, the profile given by Eq.…”

Section: Incoming Velocity Profile and Similarity Criteriamentioning

confidence: 99%

Numerical and wind tunnel modeling on the windbreak effectiveness to control the aeolian erosion of conical stockpiles

Ferreira

Lambert

2010

Environ Fluid Mech

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There are many industrial sites where open aggregate conical piles exist to store granular materials, like coal, industrial residuals, or other minerals. Usually these storage piles are placed in open areas, making them susceptible to wind erosion, which can create health, environmental, and/or economical concerns. It is common to minimize the dust emission through the placement of windbreaks in the vicinity of the storage piles, which reduces the wind speed in the vicinity of the pile's surface. In this work, some experimental results from a wind tunnel study on the erosion of a conical sand pile, exposed or protected by a fence with porosities of 0, 70, and 83%, are shown. For the sheltered cases, the windbreak was placed at several distances from the pile's leading edge, ranging from H to 4H, where H is the initial height of the non-eroded pile. The evolution of the shape of the sand pile is shown, at different instances in time, and the pile deformation quantified, using a novel experimental setup developed for wind erosion studies. This information might be regarded as a useful dataset for the benchmark of computational models aiming to produce the transient simulation of the aeolian erosion of stockpiles. The CFD results are comprised of the modeling of several experimental scenarios. The computational results for the surface wind velocity show a good correlation with the initial deformation of the pile. Based on the results, the isocontours of (u s /u r ) presented might be regarded as a good basis for the estimation of the pile shear velocity.

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Wind erosion of sand placed inside a rectangular box

Cited by 10 publications

References 14 publications

Dust emission modelling around a stockpile by using computational fluid dynamics and discrete element method

Dust emission modelling around a stockpile by using computational fluid dynamics and discrete element method

Numerical and experimental analysis of wind erosion on a sinusoidal pile

Numerical and wind tunnel modeling on the windbreak effectiveness to control the aeolian erosion of conical stockpiles

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