Study of Local Turbulence Profiles Relative to the Particle Surface in Particle-Laden Turbulent Flows

Wang, Lian‐Ping; Ardila, Oscar Gerardo Castro; Ayala, Orlando; Gao, Hui; Peng, Cheng

doi:10.1115/1.4031692

Cited by 4 publications

(4 citation statements)

References 47 publications

(102 reference statements)

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“…(2001) and Wang et al. (2016 a ). The former was performed in a simulation of particle-laden turbulent flow in a vertical channel with , but no details were provided on what the budget equation was and how this equation was examined.…”

Section: Resultsmentioning

confidence: 97%

“…2012; Wang et al. 2016 a ; Eshghinejadfard et al. 2017; Uhlmann & Chouippe 2017), which assume the short-range hydrodynamic interactions are always repulsive forces depending only on the gap distance between two approaching solid surfaces.…”

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

“…The first category is the repulsive barriers (in e.g. Uhlmann 2008;Lucci et al 2010;Shao et al 2012;Wang et al 2016a;Eshghinejadfard et al 2017;Uhlmann & Chouippe 2017), which assume the short-range hydrodynamic interactions are always repulsive forces depending only on the gap distance between two approaching solid surfaces. The other category is the Stokes lubrication forces (in e.g.…”

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

“…Vreman (2016) found that the presence of particles 26 C. Peng et al triggered the conveyance of TKE from far field to the particle surfaces to sustain the enhanced dissipation there. Two other relevant studies were reported by Kajishima et al (2001) and Wang et al (2016a). The former was performed in a simulation of particle-laden turbulent flow in a vertical channel with Re p ≈ 500, but no details were provided on what budget equation was and how this equation was examined.…”

Section: The Tke Profile and Budget Analysismentioning

confidence: 99%

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A direct numerical investigation of two-way interactions in a particle-laden turbulent channel flow

2019

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Understanding the two-way interactions between finite-size solid particles and a wall-bounded turbulent flow is crucial in a variety of natural and engineering applications. Previous experimental measurements and particle-resolved direct numerical simulations revealed some interesting phenomena related to particle distribution and turbulence modulation, but their in-depth analyses are largely missing. In this study, turbulent channel flows laden with neutrally buoyant finite-size spherical particles are simulated using the lattice Boltzmann method. Two particle sizes are considered, with diameters equal to 14.45 and 28.9 wall units. To understand the roles played by the particle rotation, two additional simulations with the same particle sizes but no particle rotation are also presented for comparison. Particles of both sizes are found to form clusters. Under the Stokes lubrication corrections, small particles are found to have a stronger preference to form clusters, and their clusters orientate more in the streamwise direction. As a result, small particles reduce the mean flow velocity less than large particles. Particles are also found to result in a more homogeneous distribution of turbulent kinetic energy (TKE) in the wall-normal direction, as well as a more isotropic distribution of TKE among different spatial directions. To understand these turbulence modulation phenomena, we analyse in detail the total and component-wise volume-averaged budget equations of TKE with the simulation data. This budget analysis reveals several mechanisms through which the particles modulate local and global TKE in the particle-laden turbulent channel flow.

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Section: Resultsmentioning

confidence: 97%

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

Section: The Tke Profile and Budget Analysismentioning

confidence: 99%

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A direct numerical investigation of two-way interactions in a particle-laden turbulent channel flow

2019

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A comparative study of immersed boundary method and interpolated bounce-back scheme for no-slip boundary treatment in the lattice Boltzmann method: Part II, turbulent flows

Peng¹,

Ayala²,

Motta³

et al. 2019

Computers & Fluids

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In the first part of this study [1], we compared the performances of two categories of no-slip boundary treatments, i.e., the interpolated bounce-back schemes and the immersed boundary methods in a series of laminar flow simulations within the lattice Boltzmann method. In this second part, these boundary treatments are further compared in the simulations of turbulent flows with complex geometry to provide a next-level assessment of these schemes. Two non-trivial turbulent flow problems, a fully developed turbulent pipe flow at a low Reynolds number, and a decaying homogeneous isotropic turbulent flow laden with a large number of resolved spherical particles are considered. The major problem of the immersed boundary method revealed by the present study is its incapability in computing the local velocity gradients inside the diffused interface, which can result in significantly

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A scalable interface-resolved simulation of particle-laden flow using the lattice Boltzmann method

Geneva

Peng

et al. 2017

Parallel Computing

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Study of Local Turbulence Profiles Relative to the Particle Surface in Particle-Laden Turbulent Flows

Cited by 4 publications

References 47 publications

A direct numerical investigation of two-way interactions in a particle-laden turbulent channel flow

A direct numerical investigation of two-way interactions in a particle-laden turbulent channel flow

A comparative study of immersed boundary method and interpolated bounce-back scheme for no-slip boundary treatment in the lattice Boltzmann method: Part II, turbulent flows

A scalable interface-resolved simulation of particle-laden flow using the lattice Boltzmann method

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