A quantitative and generalized assessment of bubble-induced turbulence models for gas-liquid systems

Magolan, Ben; Lubchenko, Nazar; Baglietto, Emilio

doi:10.1016/j.cesx.2019.100009

Cited by 12 publications

(11 citation statements)

References 40 publications

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“…Magolan et al. compared a multitude of BIT models with experimental data from Liu . They analyze the differences of the models and the deviations from the measurements.…”

Section: Two‐phase Systemsmentioning

confidence: 99%

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Models for the Numerical Simulation of Bubble Columns: A Review

Mühlbauer

Hlawitschka

Bart

2019

Chemie Ingenieur Technik

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This work reviews the state‐of‐the‐art models for the simulation of bubble columns and focuses on methods coupled with computational fluid dynamics (CFD) where the potential and deficits of the models are evaluated. Particular attention is paid to different approaches in multiphase fluid dynamics including the population balance to determine bubble size distributions and the modeling of turbulence where the authors refer to numerous published examples. Additional models for reactive systems are presented as well as a special chapter regarding the extension of the models for the simulation of bubble columns with a present solid particle phase, i.e., slurry bubble columns.

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“…Magolan et al. compared a multitude of BIT models with experimental data from Liu . They analyze the differences of the models and the deviations from the measurements.…”

Section: Two‐phase Systemsmentioning

confidence: 99%

“…Examples where LES was applied successfully for bubbly flows can be found in [131,132]. Magolan et al [133] compared a multitude of BIT models with experimental data from Liu [134]. They analyze the differences of the models and the deviations from the measurements.…”

Section: Turbulence Modelingmentioning

confidence: 99%

Models for the Numerical Simulation of Bubble Columns: A Review

Mühlbauer

Hlawitschka

Bart

2019

Chemie Ingenieur Technik

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“…The size of the first cell at the wall (Δ 1 ) influences the turbulence model through the y + , as well as the wall lubrication force. The first grid spacing near the wall (and its corresponding y + value of 16) for M1 is within the range commonly used for this problem in previous studies [39] [43] [44] [69]. The first node distance is within the active range for all wall lubrication forces considered.…”

Section: Mesh Sensitivity Studymentioning

confidence: 99%

A Comparative Study of Closure Relations for CFD Modelling of Bubbly Flow in a Vertical Pipe

Gray¹,

Ormiston²

2021

OJFD

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Commercial code CFX was used to examine the performance of a two-fluid model to predict the details of upward isothermal bubbly flow of air and water in a vertical pipe. The model equations are volume-averaged Navier-Stokes equations that require closure models for interfacial forces and bubble-induced turbulence effects. Two-equation SST and k-epsilon RANS turbulence models were also used. A parametric study of closure models included both standard options in CFX and previously published novel closure models that were implemented with user-defined functions. The CFD simulations were compared with two cases from the MTLoop experiments by Lucas et al. at the Helmholtz-Zentrum Dresden Rossendorf: one with wall-peak void fraction profile (MT039), and another with a core-peak void fraction profile (MT118). The effect of changing the drag force closures was not significant for the set examined. Poor predictions were found when the lift force and wall lubrication models were incompatible in magnitude. There was no significant effect of changing the liquid phase turbulence model. Changing the bubble-induced turbulence models, however, had a significant impact on the radial void fraction profile. The novel wall force from Lubchenko et al. at the Massachusetts Institute of Technology significantly improved the prediction of the near wall void fraction in the wall peak profile.

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“…Over the last three decades, remarkable works have been accomplished in developing two-equation RANS models with source terms capturing the so-called bubble-induced turbulence (BIT) (Lopez de Bertodano et al, 1994;Morel, 1997;Troshko and Hassan, 2001;Rzehak and Krepper, 2013;Colombo and Fairweather, 2015;Ma, 2017;Vaidheeswaran and Hibiki, 2017;Liu et al, 2018;Liao et al, 2019;Magolan et al, 2019). These linear eddy-viscosity models take the bubble influence into account by adding source terms in the turbulence transport equations for both the turbulent kinetic energy (TKE, k) and a turbulence length-scale related parameter, e.g., the turbulence dissipation rate ε.…”

Section: Introductionmentioning

confidence: 99%

Study on bubble-induced turbulence in pipes and containers with Reynolds-stress models

Liao

2022

Exp. Comput. Multiph. Flow

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Bubbly flow still represents a challenge for large-scale numerical simulation. Among many others, the understanding and modelling of bubble-induced turbulence (BIT) are far from being satisfactory even though continuous efforts have been made. In particular, the buoyancy of the bubbles generally introduces turbulence anisotropy in the flow, which cannot be captured by the standard eddy viscosity models with specific source terms representing BIT. Recently, on the basis of bubble-resolving direct numerical simulation data, a new Reynolds-stress model considering BIT was developed by Ma et al. (J Fluid Mech, 883: A9 (2020)) within the Euler—Euler framework. The objective of the present work is to assess this model and compare its performance with other standard Reynolds-stress models using a systematic test strategy. We select the experimental data in the BIT-dominated range and find that the new model leads to major improvements in the prediction of full Reynolds-stress components.

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A quantitative and generalized assessment of bubble-induced turbulence models for gas-liquid systems

Cited by 12 publications

References 40 publications

Models for the Numerical Simulation of Bubble Columns: A Review

Models for the Numerical Simulation of Bubble Columns: A Review

A Comparative Study of Closure Relations for CFD Modelling of Bubbly Flow in a Vertical Pipe

Study on bubble-induced turbulence in pipes and containers with Reynolds-stress models

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