Transport of particles by a turbulent flow around an obstacle – a numerical and a wind tunnel approach

Laslandes, S; Sacre, Christian

doi:10.1016/s0167-6105(98)00052-x

Cited by 17 publications

(13 citation statements)

References 2 publications

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“…Modified versions of the k-ε model, such as the renormalised group (RNG) theory [52] and the C-K [53] models have been tested by other authors in similar applications [23,54]. Leitl and Meroney [55] demonstrated that the standard and the RNG k-ε turbulence models gave almost the same results for the simulated flow field inside a street canyon bounded by sharp-edged buildings.…”

Section: Discussion and Recommendationsmentioning

confidence: 99%

Numerical Model Inter-comparison for Wind Flow and Turbulence Around Single-Block Buildings

Vardoulakis

Dimitrova

Richards³

et al. 2010

Environ Model Assess

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Wind flow and turbulence within the urban canopy layer can influence the heating and ventilation of buildings, affecting the health and comfort of pedestrians, commuters and building occupants. In addition, the predictive capability of pollutant dispersion models is heavily dependent on wind flow models. For that reason, well-validated microscale models are needed for the simulation of wind fields within built-up urban microenvironments. To address this need, an inter-comparison study of several such models was carried out within the European research network ATREUS. This work was conducted as part of an evaluation study for microscale numerical models, so they could be further implemented to provide reliable wind fields for building energy simulation and pollutant dispersion codes. Four computational fluid dynamics (CFD) models (CHENSI, MIMO, VADIS and FLUENT) were applied to reduced-scale single-block buildings, for which quality-assured and fully documented experimental data were obtained. Simulated wind and turbulence fields around two surface-mounted cubes of different dimensions and wall roughness were compared against experimental data produced in the wind tunnels of the Meteorological Institute of Hamburg University under different inflow and boundary conditions. The models reproduced reasonably well the general flow patterns around the single-block buildings, although over-predictions of the turbulent kinetic energy were observed near stagnation points in the upwind impingement region. Certain discrepancies between the CFD models were also identified and interpreted. Finally, some general recommendations for CFD model evaluation and use in environmental applications are presented

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Section: Discussion and Recommendationsmentioning

confidence: 99%

Numerical Model Inter-comparison for Wind Flow and Turbulence Around Single-Block Buildings

Vardoulakis

Dimitrova

Richards³

et al. 2010

Environ Model Assess

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“…Since Laslandes and Sacre [9] only publicized the distribution of solid particle velocities, we merely compare the velocities of solid particles calculated by k-e-S p model with two two-fluid models (k-e-A p , k-e-k p ) and experiment. Fig.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

“…To test the k-e-S p model, the physical and numerical results for dilute gas-solid two-phase flow by Laslandes and Sacre [9] are used. Fig.…”

Section: Physical Domainmentioning

confidence: 99%

“…U ref is the inlet gas velocity equal to 10.5 m/s; the solid mass loading is 0.1-0.2; solid particles are made of copper, diameter is 70 lm and the density of the particles is q s = 8800 kg/m 3 ; the carrier gas is air at atmospheric pressure and the density of gas is q g = 1.2 kg/m 3 . Laslandes and Sacre [9] employed two turbulent two-phase flow models to calculate the gas-solid two-phase flow of this backwardfacing step and compared their computed results with experimental measurements. In this paper, the author employed the k-e-S p model to calculate this flow numerically at a mass loading of 0.2 and compared the computed results with LaslandesÕs numerical and experiment results.…”

Section: Physical Domainmentioning

confidence: 99%

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CFD of turbulent transport of particles behind a backward-facing step using a new model—k-ε-Sp

Shang

2005

Applied Mathematical Modelling

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The k-e-S p model, describing two-dimensional gas-solid two-phase turbulent flow, has been developed. In this model, the diffusion flux and slip velocity of solid particles are introduced to represent the particle motion in two-phase flow. Based on this model, the gas-solid two-phase turbulent flow behind a vertical backward-facing step is simulated numerically and the turbulent transport velocities of solid particles with high density behind the step are predicted. The numerical simulation is validated by comparing the results of the numerical calculation with two other two-phase turbulent flow models (k-e-A p , k-e-k p ) by Laslandes and the experimental measurements. This model, not only has the same virtues of predicting the longitudinal transport of the solid particles as the present practical two-phase flow models, but also can predict the lateral transport of the solid particles correctly.

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“…(23)-(26) with only a minor difference in the closure models of some phase interaction terms. Figure1 shows the simulation results of particle number density in wind-sand flows behind an obstacle, reported by Laslandes and Sacre [18], using both k--k p and k--A p models and their comparisons with experiments. It is seen that the k--k p model is much better than the k--A p model in predicting the particle dispersion.…”

Section: The Unified Second-order Moment (Usm Two-phase Reynolds Strmentioning

confidence: 99%

Second-order moment modeling of dispersed two-phase turbulence—Part 1: USM, k-ɛ-k p, and non-linear k-ɛ-k p two-phase turbulence models

Zhou

2011

Sci. China Phys. Mech. Astron.

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Turbulent dispersed multiphase flows, including gas-particle, gas-droplet and bubble-liquid flows, are widely encountered in various engineering facilities. Modeling of two-phase turbulence, in particular the dispersed phase turbulence, is the key problem in the Eulerian-Eulerian simulation of practical dispersed multiphase flows. Although different models were developed and used, the experimental validation shows that they cannot always give satisfactory prediction results. In this paper the present author give a detailed review of the unified second-order moment (USM), k--k p and nonlinear k--k p two-phase turbulence models, proposed by him. The derivation and closure of these models are described in detail and the experimental validation and application of these models are extensively discussed. dispersed multiphase flows, second-order moment model, two-phase turbulence

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Transport of particles by a turbulent flow around an obstacle – a numerical and a wind tunnel approach

Cited by 17 publications

References 2 publications

Numerical Model Inter-comparison for Wind Flow and Turbulence Around Single-Block Buildings

Numerical Model Inter-comparison for Wind Flow and Turbulence Around Single-Block Buildings

CFD of turbulent transport of particles behind a backward-facing step using a new model—k-ε-Sp

Second-order moment modeling of dispersed two-phase turbulence—Part 1: USM, k-ɛ-k p, and non-linear k-ɛ-k p two-phase turbulence models

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