Direct Numerical Simulations of spherical bubbles in vertical turbulent channel flow

Santarelli, Claudio; Fröhlich, Jochen

doi:10.1016/j.ijmultiphaseflow.2015.05.007

Cited by 56 publications

(37 citation statements)

References 58 publications

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“…The extension to non-spherical particles is relatively easy [55,54,58] and also additional deformation of the particle may be introduced [56,59]. Recently, the proposed method was used in several studies of bubbles being modeled as light particles with very satisfactory behavior including bubble chains, swarms and bubble foam [57,53,19,18,20] and it is being applied to other problems of this type. Second order convergence is obtained (Table 1).…”

Section: Discussionmentioning

confidence: 99%

A temporal discretization scheme to compute the motion of light particles in viscous flows by an immersed boundary method

Schwarz

Kempe

Fröhlich

2015

Journal of Computational Physics

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Section: Discussionmentioning

confidence: 99%

A temporal discretization scheme to compute the motion of light particles in viscous flows by an immersed boundary method

Schwarz

Kempe

Fröhlich

2015

Journal of Computational Physics

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“…Many other authors have adopted this model for simulations involving dilute suspensions of particles. For example, Uhlmann (2008) and Santarelli and Fröhlich (2015) investigated particles in a vertical turbulent channel flow, Lucci et al (2010) studied the impact of finite size particles on isotropic turbulence, and Breugem (2012) and Picano et al (2015) have presented results for a horizontal flow laden with neutrally-buoyant particles. In these simulations, particles rarely came in contact, and thus were successfully governed mostly by the IBM, using the repulsive potential only to prevent overlap.…”

Section: Introductionmentioning

confidence: 99%

A collision model for grain-resolving simulations of flows over dense, mobile, polydisperse granular sediment beds

Biegert

Vowinckel

Meiburg

2017

Journal of Computational Physics

215

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We present a collision model for phase-resolved Direct Numerical Simulations of sediment transport that couple the fluid and particles by the Immersed Boundary Method. Typically, a contact model for these types of simulations comprises a lubrication force for particles in close proximity to another solid object, a normal contact force to prevent particles from overlapping, and a tangential contact force to account for friction. Our model extends the work of previous authors to improve upon the time integration scheme to obtain consistent results for particle-wall collisions. Furthermore, we account for polydisperse spherical particles and introduce new criteria to account for enduring contact, which occurs in many sediment transport situations. This is done without using arbitrary values for physically-defined parameters and by maintaining the full momentum balance of a particle in enduring contact. We validate our model against several test cases for binary particle-wall collisions as well as the collective motion of a sediment bed sheared by a viscous flow, yielding satisfactory agreement with experimental data by various authors.

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“…Dominating distances between particles or bubbles can be identified by the discrete radial pair correlation function g r [26,27]. To account for the dimensions of the container, the analysis is done here in a two-dimensional manner.…”

Section: Details For the Experimental And Numerical Proceduresmentioning

confidence: 99%

Combined experimental and numerical analysis of a bubbly liquid metal flow

Krull

Strumpf

Keplinger

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The paper proposes a combined experimental and numerical procedure for the investigation of bubbly liquid-metal flows. It describes the application to a model configuration consisting of a recirculating GaInSn flow driven by an argon bubble chain. The experimental methods involve X-ray measurements to detect the bubbles and UDV measurements to gain velocity information about the liquid metal. The chosen numerical method is an immersed boundary method extended to deformable bubbles. The model configuration includes typical phenomena occurring in industrial applications and allows insight into the physics of bubbly liquid-metal flows. It constitutes an attractive test case for assessing further experimental and numerical methods.

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Direct Numerical Simulations of spherical bubbles in vertical turbulent channel flow

Cited by 56 publications

References 58 publications

A temporal discretization scheme to compute the motion of light particles in viscous flows by an immersed boundary method

A temporal discretization scheme to compute the motion of light particles in viscous flows by an immersed boundary method

A collision model for grain-resolving simulations of flows over dense, mobile, polydisperse granular sediment beds

Combined experimental and numerical analysis of a bubbly liquid metal flow

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