A fictitious domain method for particulate flows of arbitrary density ratio

Xia, Yan; Yu, Zhaosheng; Deng, Jian

doi:10.1016/j.compfluid.2019.104293

Cited by 8 publications

(6 citation statements)

References 51 publications

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“…Vreman (2015) demonstrated that the non-uniform part of the mean feedback drag force contributed significantly to particle-induced turbulence attenuation. Xia, Yu & Deng (2019) observed that, at the same settling coefficient, light (bubble) particles attenuated the turbulence in a downward channel flow, where the particles migrated towards the channel centre, whereas light particles enhanced the turbulence in an upward channel, where the particles migrated towards the channel wall. From these observations, it seems that the particle feedback force distributed in the bulk region suppresses the self-generation of large-scale vortices in the channel flow.…”

Section: Vortex Structurementioning

confidence: 95%

Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

Xia

Guo

et al. 2021

J. Fluid Mech.

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Section: Vortex Structurementioning

confidence: 95%

Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

Xia

Guo

et al. 2021

J. Fluid Mech.

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“…Considering single-phase flow and ignoring the influence of solid phase on continuous phase flow, continuity and momentum can be written as Eqs ( 1 ) and ( 2 ) [ 19 ]. ∇ is the vector of Differential operator, p is the pressure, ρ is the fluid density, u is the velocity, g is the Gravitational acceleration, τviscous shear stress can be defined by Formula ( 3 ) [ 20 ]。 By substituting the viscous shear τ in a Newtonian fluid from Eq (3) into Eq ( 1 ) and considering an incompressible Newtonian fluid (where the shear deformation of the fluid under stress is linear), Eq ( 4 ) can be obtained. As the Reynolds number increases (i.e., the ratio of inertial to viscous forces) the flow state changes from creep (the convective term in the momentum equation can be ignored), to laminar, to transitional, and finally to turbulent.…”

Section: Methodsmentioning

confidence: 99%

Study on the diffusion and deposition law of pore slurry in gangue filling zone based on CFD-DEM coupling

Ji,

Gao,

Guo

et al. 2024

PLoS ONE

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In this study, the slurry diffusion in a cavity filled with coal gangue was studied by combining experimental and numerical simulation methods. By calibrating slurry and particle materials, the grouting process in coal gangue filling area is simulated successfully, and the change of slurry diffusion flow field and particle movement and settling process in different dimensions are deeply analyzed. Both experimental and numerical simulation results show that the particle settlement presents a bell-shaped curve, which is of great significance for understanding the particle movement and settlement behavior in the filling cavity. In addition, it is found that the grouting speed has a significant effect on the particle settlement during the slurry diffusion process. When the grouting speed increases from 0.1m /s to 0.2m /s, the particle settlement and diffusion range increases about twice. In the plane flow field, it is observed that the outward diffusion trend and speed of grouting are more obvious. It is worth noting that in the whole process of grouting, it is observed that with the increase of grouting distance and depth, both the velocity of slurry and particles show a trend of rapid initial decline and gradually slow down, and the flow velocity of slurry near the grouting outlet at a flow rate of 0.2m/s is 2–4 times that of 0.1m/s. This provides important enlightenment for the porous seepage effect at different grouting speeds.

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“…In [5], a fictitious domain method with Distributed Lagrange Multipliers for simulating two-dimensional (hereinafter 2D) unsteady shear-thinning non-newtonian incompressible flow in a single-screw and twin-screw extruder is developed. The issues of flow motion with an arbitrary density of particles are considered in [6].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…In [4][5][6], the authors successfully applied the fictitious domain method for numerical simulation of incompressible fluids in different areas, carried out theoretical and numerical analyses, and also used the finite element method. It is important to note that the finite element method won't always work for parallel computing.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Development of parallel implementation for the Navier-Stokes equation in doubly connected areas using the fictitious domain method

Temirbekov

Altybay

Temirbekova

et al. 2022

EEJET

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This paper presents a numerical realization of the Navier-Stokes equations in irregular domains using the fictitious domain method with a continuation along with the lowest coefficient. To solve numerous connected issues in irregular regions, the fictitious domain method is broadly used. The advantage of the fictitious domain method is that the problem is solved not in the original complex domain, but in a few other, easier domains. Using the method, computation is done easily for a sufficiently wide class of problems with arbitrary computational domains. The problem is solved using two methods. The primary method is based on the development of a distinct issue in variables of the stream function and the vortex velocity using the pressure uniqueness condition. The second method is to understand the expressed issue by the fictitious domain method with a continuation by lower coefficients. Using the fictitious domain method, a computational algorithm is constructed based on the explicit finite difference schemes. The finite difference scheme is stable and has high computational accuracy and it gives the possibility to parallelize. Temperature distributions and stream functions are presented as numerical results. A parallel algorithm has been developed using Open Multi-Processing (hereinafter OpenMP) and Message Passing Interface (hereinafter MPI) technologies. Within the parallel approach, we used OpenMP technology for parallel calculation of vorticity and stream work, and for calculating temperature we applied MPI technology. The performance analysis on our parallel code shows favorable strong and weak scalability. The test results show that the code running in the parallel approach gives the expected results by comparing our results with those obtained while running the same simulation on the central processing unit (CPU)

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A fictitious domain method for particulate flows of arbitrary density ratio

Cited by 8 publications

References 51 publications

Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

Study on the diffusion and deposition law of pore slurry in gangue filling zone based on CFD-DEM coupling

Development of parallel implementation for the Navier-Stokes equation in doubly connected areas using the fictitious domain method

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