Towards large eddy simulation of isothermal two-phase flows: Governing equations and a priori tests

Labourasse, Emmanuel; Lacanette, Delphine; Toutant, Adrien; Lubin, Pierre; Vincent, Stéphane; Lebaigue, Olivier; Caltagirone, Jean‐Paul; Sagaut, Pierre

doi:10.1016/j.ijmultiphaseflow.2006.05.010

Cited by 113 publications

(109 citation statements)

References 57 publications

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“…The main conclusion concerning a priori LES filtering is that the inertia term is not predominant in two-phase flows with fragmentation and rupture of interface. This conclusion is different from that of the studies of [3,[10][11][12][13]. concerning LES models, functional modeling do 1 not correlate to filtered DNS results whereas structural approaches do.…”

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confidence: 60%

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A priori filtering and LES modeling of turbulent two-phase flows application to phase separation

et al. 2018

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The Large Eddy Simulation (LES) of two-phase flows with resolved scale interfaces is investigated through the a priori filtering of Direct Numerical Simulations (DNS) of one-fluid and multifield models. A phase inversion benchmark [1][2][3][4] is considered highlighting many coalescence and interface rupture events in a kind of atomization process. The order of magnitude of specific two-phase subgrid LES terms is first considered with the two modeling approaches. Then, different existing models such as Smagorinsky [5], Wall-Adapting Local Eddyviscosity (WALE) model [6], Bardina [7], Mixed [8] and Approximate Deconvolution Model (ADM) [9] are used to account for two-phase subgrid effects. These models are compared to filtered DNS results. The main conclusion concerning a priori LES filtering is that the inertia term is not predominant in two-phase flows with fragmentation and rupture of interface. This conclusion is different from that of the studies of [3,[10][11][12][13]. concerning LES models, functional modeling do 1 not correlate to filtered DNS results whereas structural approaches do. Bardina and ADM are clearly the good LES framework to consider for two-phase flows with resolved scale interfaces. ADM is clearly better than Bardina in our study. The authors greatly acknowledge the reviewer for its comments and remarks that have guided us in improving the technical and editorial aspects of the manuscript. From a general point of view, all the comments and remarks recommended by the reviewer have been taken into account. They are highlighted in the text in red. More specifically, we can detail them as follows: COMPUTERS & FLUIDS 1) I would recommend to add the main conclusions to the abstract and to add a separate section conclusions to the paper.In agreement with reviewer remark and in order to improve the fast reading and understanding of the paper, we have included a conclusion part in the abstract. In addition, the last section have been extended to "Summary, conclusion and future work", with addition of conclusions in order to highlight the originality and main results of the work. 2) Abstract : DNS and ADM should be defined.Done. The same has been achieved for the Wall-Adapting Local Eddy-viscosity (WALE) model. 3) A streak of the interface points towards the upper left corner of the box. Is that physical?Yes, this a physical feature of the interface. As we are dealing with liquid-liquid twophase flows, when the light fluid (blue surface) goes to the top part of the cavity under gravity effects, heavy liquid can be trapped near vertical walls or vertical corners, inducing this king of interface topology.4) The sentence "Among the few existing …" seems to have a grammar mistake. Detailed Response to ReviewersThis sentence has been rewritten as follows "Among the few existing references, it is worth mentioning the work on LES formulation for the one-fluid model and subsequent a priori LES filtering of DNS simulations for the estimate of new specific two-phase contributions in the mass, momentu...

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“…This conclusion is different from that of the studies of [3,[10][11][12][13]. concerning LES models, functional modeling do 1 *Manuscript Click here to download Manuscript: CAF_TI2015.pdf Click here to view linked References not correlate to filtered DNS results whereas structural approaches do.…”

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confidence: 70%

A priori filtering and LES modeling of turbulent two-phase flows application to phase separation

et al. 2018

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“…The analysis of unresolved interfacial scales compared with unresolved turbulence scales conducted hitherto (Labourasse et al 2007;Liovic & Lakehal 2007b) is also worth reconsidering in the present 2D simulations of the TK96 problem. A sample flow field after 11 wave periods is chosen and assumed to be a DNS flow field; a motivation for using a flow field from fully developed wave breaking is because it features both 2D representations of bubble entrainment and spray droplet formation, , simulation; -------, experiment.…”

Section: A Priori Evaluationmentioning

confidence: 98%

Turbulence structure and interaction with steep breaking waves

Lakehal

Liovic

2011

J. Fluid Mech.

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Large-eddy and interface simulation using an interface tracking-based multi-fluid flow solver is conducted to investigate the breaking of steep water waves on a beach of constant bed slope. The present investigation focuses mainly on the 'weak plunger' breaking wave type and provides a detailed analysis of the two-way interaction between the mean fluid flow and the sub-modal motions, encompassing wave dynamics and turbulence. The flow is analysed from two points of views: mean to sub-modal exchange, and wave to turbulence interaction within the sub-modal range. Wave growth and propagation are due to energy transfer from the mean flow to the waves, and transport of mean momentum by these waves. The vigorous downwellingupwelling patterns developing at the head and tail of each breaker are shown to generate both negative-and positive-signed energy exchange contributions in the thin sublayer underneath the water surface. The details of these exchange mechanisms are thoroughly discussed in this paper, together with the interplay between threedimensional small-scale breaking associated with turbulence and the dominant twodimensional wave motion. A conditional zonal analysis is proposed for the first time to understand the transient mechanisms of turbulent kinetic energy production, decay, diffusion and transport and their dependence and/or impact on surface wrinkling over the entire breaking process. The simulations provide a thorough picture of airliquid coherent structures that develop over the breaking process, and link them to the transient mechanisms responsible for their local incidence.

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“…Detailed overviews on methods and models for CFD of multiphase flows can be found in textbooks (Drew and Passman, 1999;Crowe et al 2011). More information about turbulence modelling in the framework of multiphase flows is given by Labourasse et al (2007) and Bombardelli (2012). Smoothed-particle hydrodynamics (SPH) is also a mesh-free method which can be used to describe accurately the 3D surf zone hydrodynamics, as recently shown by Farahani and Dalrymple (2014) who investigated some novel coherent turbulent vortical structures under broken solitary waves.…”

Section: Introductionmentioning

confidence: 99%

Are breaking waves, bores, surges and jumps the same flow?

Lubin

Chanson

2016

Environ Fluid Mech

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The flow structure in the aerated region of the roller generated by breaking waves remains a great challenge to study, with large quantities of entrained air and turbulence interactions making it very difficult to investigate in details. A number of analogies were proposed between breaking waves in deep or shallow water, tidal bores and hydraulic jumps. Many numerical models used to simulate waves in the surf zone do not implicitly simulate the breaking process of the waves, but are required to parameterise the wave-breaking effects, thus relying on experimental data. Analogies are also assumed to quantify the roller dynamics and the energy dissipation. The scope of this paper is to review the different analogies proposed in the literature and to discuss current practices. A thorough survey is offered and a discussion is developed an aimed at improving the use of possible breaking proxies. The most recent data are revisited and scrutinised for the use of most advanced numerical models to educe the surf zone hydrodynamics. In particular, the roller dynamics and geometrical characteristics are discussed. An open discussion is proposed to explore the actual practices and propose perspectives based on the most appropriate analogy, namely the tidal bore.

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Towards large eddy simulation of isothermal two-phase flows: Governing equations and a priori tests

Cited by 113 publications

References 57 publications

A priori filtering and LES modeling of turbulent two-phase flows application to phase separation

A priori filtering and LES modeling of turbulent two-phase flows application to phase separation

Turbulence structure and interaction with steep breaking waves

Are breaking waves, bores, surges and jumps the same flow?

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