Spectral-based simulations of particle-laden turbulent flows

Sengupta, Kaustav; Shotorban, Babak; Jacobs, Gustaaf; Mashayek, Farzad

doi:10.1016/j.ijmultiphaseflow.2009.03.007

Cited by 26 publications

(3 citation statements)

References 108 publications

(143 reference statements)

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“…Since this pioneering work, several classes of particle SGS models have been developed. These models, which are suitable either for LES or RANS or both, can be grouped into two main categories [98,115]: structural models (sometimes referred to as deterministic [21]), which aim at reconstructing the entire subfilter velocity field, and stochastic models (sometimes referred to as functional [98]), which aim at retrieving only some statistical features of the subfilter 2 The Lagrangian integral timescale of the subgrid fluid velocity seen by a fluid particle is defined as follows:…”

Section: Overview Of Particle Sgs Modelsmentioning

confidence: 99%

Large-eddy simulation of turbulent dispersed flows: a review of modelling approaches

Marchioli

2017

Acta Mech

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In large-eddy simulation (LES) of turbulent dispersed flows, modelling and numerical inaccuracies are incurred because LES provides only an approximation of the filtered velocity. Interpolation errors can also occur (on coarse-grained domains, for instance). These inaccuracies affect the estimation of the forces acting on particles, obtained when the filtered fluid velocity is supplied to the Lagrangian equation of particle motion, and accumulate in time. As a result, particle trajectories in LES fields progressively diverge from particle trajectories in DNS fields, which can be considered as the exact numerical reference: the flow fields seen by the particles become less and less correlated, and the forces acting on particles are evaluated at increasingly different locations. In this paper, we review models and strategies that have been proposed in the EulerianLagrangian framework to correct the above-mentioned sources of inaccuracy on particle dynamics and to improve the prediction of particle dispersion in turbulent dispersed flows.

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Section: Overview Of Particle Sgs Modelsmentioning

confidence: 99%

Large-eddy simulation of turbulent dispersed flows: a review of modelling approaches

Marchioli

2017

Acta Mech

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“…Application of TVD schemes is justified for detonation flows as well, which are characterized by presence of ignition and combustion fronts (narrow region with a sharp change in flow parameters). WENO-type finite difference schemes of 3rd and 5th order (WENO-Z scheme) are used in [18,19] for the simulation of turbulent compressible gas-particle flows (Eulerian-Lagrangian approach is applied). Sampling of main equations is carried out on a uniform grid.…”

Section: Introductionmentioning

confidence: 99%

Interaction of a shock wave with an array of particles and effect of particles on the shock wave weakening

et al. 2017

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Two-phase systems that involve gas-particle or gas-droplet flows are widely used in aerospace and power engineering. The problems of weakening and suppression of detonation during saturation of a gas or liquid flow with the array of solid particles are considered. The tasks, associated with the formation of particles arrays, dust lifting behind a travelling shock wave, ignition of particles in high-speed and high-temperature gas flows are adjoined to safety of space flight. The mathematical models of shock wave interaction with the array of solid particles are discussed, and numerical methods are briefly described. The numerical simulations of interaction between sub-and supersonic flows and an array of particles being in motionless state at the initial time are performed. Calculations are carried out taking into account the influence that the particles cause on the flow of carrier gas. The results obtained show that inert particles significantly weaken the shock waves up to their suppression, which can be used to enhance the explosion safety of spacecrafts.

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“…In the last decades, several examples of LPT coupled with LES of wall-bounded turbulent flows can be found in the literature [9][10][11][12][13][14][15][16][17][18][19]. In most of the earlier studies, the fluid SGS velocity fluctuations were simply neglected in the particle motion equations [9-11, 14, 15].…”

Section: Introductionmentioning

confidence: 99%

Statistical properties of an ideal subgrid-scale correction for Lagrangian particle tracking in turbulent channel flow

Bianco

Chibbaro

Marchioli

et al. 2011

J. Phys.: Conf. Ser.

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One issue associated with the use of Large-Eddy Simulation (LES) to investigate the dispersion of small inertial particles in turbulent flows is the accuracy with which particle statistics and concentration can be reproduced. The motion of particles in LES fields may differ significantly from that observed in experiments or direct numerical simulation (DNS) because the force acting on the particles is not accurately estimated, due to the availability of the only filtered fluid velocity, and because errors accumulate in time leading to a progressive divergence of the trajectories. This may lead to different degrees of inaccuracy in the prediction of statistics and concentration. We identify herein an ideal subgrid correction of the a-priori LES fluid velocity seen by the particles in turbulent channel flow. This correction is computed by imposing that the trajectories of individual particles moving in filtered DNS fields exactly coincide with the particle trajectories in a DNS. In this way the errors introduced by filtering into the particle motion equations can be singled out and analyzed separately from those due to the progressive divergence of the trajectories. The subgrid correction term, and therefore the filtering error, is characterized in the present paper in terms of statistical moments. The effects of the particle inertia and of the filter type and width on the properties of the correction term are investigated.

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Spectral-based simulations of particle-laden turbulent flows

Cited by 26 publications

References 108 publications

Large-eddy simulation of turbulent dispersed flows: a review of modelling approaches

Large-eddy simulation of turbulent dispersed flows: a review of modelling approaches

Interaction of a shock wave with an array of particles and effect of particles on the shock wave weakening

Statistical properties of an ideal subgrid-scale correction for Lagrangian particle tracking in turbulent channel flow

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