Turbulent drag reduction using fluid spheres

Gillissen, J. J. J.

doi:10.1017/jfm.2012.510

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…The reduction of flow drag due to the presence of the particles has been reported in some previous works [16][17][18]. In their study, Gillissen [19] used lattice-Boltzmann and immersed boundary methods to investigate the drag reduction in turbulent Couette flow of the suspensions of neutrally fluid spheres and of diameter larger than the Kolmogorov length scale. The drag reduction originates in the logarithmic region, while a slight increase of drag occurs in the buffer region.…”

Section: Introductionmentioning

confidence: 86%

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

et al. 2017

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The dynamic and thermal performance of particleladen turbulent flow is investigated via direction numerical simulation combined with the Lagrangian point-particle tracking under the condition of two-way coupling, with a focus on the contributions of particle feedback effect to momentum and heat transfer of turbulence. We take into account the effects of particles on flow drag and Nusselt number and explore the possibility of drag reduction in conjunction with heat transfer enhancement in particle-laden turbulent flows. The effects of particles on momentum and heat transfer are analyzed, and the possibility of drag reduction in conjunction with heat transfer enhancement for the prototypical case of particle-laden turbulent channel flows is addressed. We present results of turbulence modification and heat transfer in turbulent particle-laden channel flow, which shows the heat transfer reduction when large inertial particles with low specific heat capacity are added to the flow. However, we also found an enhancement of the heat transfer and a small reduction of the flow drag when particles with high specific heat capacity are involved. The present results show that particles, which are active agents, interact not only with the velocity field, but also the temperature field and can cause a dissimilarity in momentum and heat transport. This demonstrates that the possibility to increase heat transfer and B Yuhong Dong suppress friction drag can be achieved with addition of particles with different thermal properties.

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Section: Introductionmentioning

confidence: 86%

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

et al. 2017

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“…As an alternative approach, the LBM has also been applied as a PRS method for turbulent particle-laden flows [22][23][24][25][26]. The LBM approach features a high-level data locality essential to efficient parallel implementation of PRS.…”

Section: Introductionmentioning

confidence: 99%

Flow Modulation by Finite-Size Neutrally Buoyant Particles in a Turbulent Channel Flow

Wang

Peng

Guo³

et al. 2015

Journal of Fluids Engineering

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A fully mesoscopic, multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) is developed to perform particle-resolved direct numerical simulation (DNS) of wall-bounded turbulent particle-laden flows. The fluid–solid particle interfaces are treated as sharp interfaces with no-slip and no-penetration conditions. The force and torque acting on a solid particle are computed by a local Galilean-invariant momentum exchange method. The first objective of the paper is to demonstrate that the approach yields accurate results for both single-phase and particle-laden turbulent channel flows, by comparing the LBM results to the published benchmark results and a full-macroscopic finite-difference direct-forcing (FDDF) approach. The second objective is to study turbu-lence modulations by finite-size solid particles in a turbulent channel flow and to demon-strate the effects of particle size. Neutrally buoyant particles with diameters 10 % and 5% the channel width and a volume fraction of about 7 % are considered. We found that the mean flow speed was reduced due to the presence of the solid particles, but the local phase-averaged flow dissipation was increased. The effects of finite particle size are reflected in the level and location of flow modulation, as well as in the volume fraction distribution and particle slip velocity near the wall. [DOI: 10.1115/1.4031691]

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“…Recently, PRSs of turbulent particle-laden flow have become feasible, using both the macroscopic N-S equation [18,19,22,30] and the mesoscopic lattice Boltzmann equation [24][25][26][27][28]. In each approach, the physical accuracy of the computational treatment of the moving fluid-solid interfaces will continue to be improved [29,34], and direct intercomparison between two different approaches serves as a way to build up fidelity of a PRS tool [28].…”

Section: Discussionmentioning

confidence: 99%

“…Alternatively, mesoscopic methods, such as the LBM, have also been developed as a PRS method for turbulent particle-laden flows [24][25][26][27][28]. The LBM approach features a high-level data locality ideal for efficient parallel implementation.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Ardila

Ayala

et al. 2015

Journal of Fluids Engineering

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As particle-resolved simulations (PRSs) of turbulent flows laden with finite-size solid particles become feasible, methods are needed to analyze the simulated flows in order to convert the simulation data to a form useful for model development. In this paper, the focus is on turbulence statistics at the moving fluid–solid interfaces. An averaged governing equation is developed to quantify the radial transport of turbulent kinetic energy when viewed in a frame moving with a solid particle. Using an interface-resolved flow field solved by the lattice Boltzmann method (LBM), we computed each term in the transport equation for a forced, particle-laden, homogeneous isotropic turbulence. The results illustrate the distributions and relative importance of volumetric source and sink terms, as well as pressure work, viscous stress work, and turbulence transport. In a decaying particle-laden flow, the dissipation rate and kinetic energy profiles are found to be self-similar.

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Turbulent drag reduction using fluid spheres

Cited by 9 publications

References 24 publications

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

Flow Modulation by Finite-Size Neutrally Buoyant Particles in a Turbulent Channel Flow

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

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