Turbulent flow in a square cross-sectioned bubble column computed by a scale-resolving Reynolds-stress model

Ullrich, M.; Krumbein, Benjamin; Maduta, R.; Jakirlić, Suad

doi:10.1016/j.ces.2020.116201

Cited by 7 publications

(4 citation statements)

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“…The present BIT model is now tested for steady fully developed bubbly flows with very encouraging results. In the future work, we will implement this BIT model within the scale-resolving simulations framework (Fröhlich and von Terzi, 2008) as suggested by Ullrich et al (2021), so that the Euler-Euler approach coupled with steady or unsteady RANS modelling can accurately predict the turbulence parameters both for the steady full developed cases, as well as unsteady cases, like bubble plume.…”

Section: Discussionmentioning

confidence: 99%

“…However, the success in this special case cannot be generalized to all kinds of bubbly flows. In contrast, the experiment of Deen et al (2001) has also been simulated very accurately in terms of averaged liquid statistics by using different kinds of scale-resolving simulations without considering any BIT effect (Deen et al, 2001;Ničeno et al, 2008;Ma et al, 2015a;Ullrich et al, 2021). In these cited references, they show that compared to BIT the undulatory modulation of bubble plume is the dominant effect in such a flow, generating the most velocity fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…However, such an assumption cannot be applied for real situations of finite-size bubbles (say several millimetres), where the wake effect is dominant (Riboux et al, 2010). Further EE-RSMs for bubbly flows were performed by Cokljat et al (2006), Colombo and Fairweather (2015), and recently by Ullrich et al (2021). While Cokljat et al (2006) and Ullrich et al (2021) employed an isotropic source tensor to capture BIT, Colombo and Fairweather (2015) used a larger BIT source term in the direction of slip velocity between bubble and fluid.…”

Section: Introductionmentioning

confidence: 99%

“…Further EE-RSMs for bubbly flows were performed by Cokljat et al (2006), Colombo and Fairweather (2015), and recently by Ullrich et al (2021). While Cokljat et al (2006) and Ullrich et al (2021) employed an isotropic source tensor to capture BIT, Colombo and Fairweather (2015) used a larger BIT source term in the direction of slip velocity between bubble and fluid. In all the above studies, the additional BIT tensor in the RSM resulted from various phenomenological modelling arguments.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Discussionmentioning

confidence: 99%