Multifield hybrid approach for two-phase flow modeling – Part 1: Adiabatic flows

Denefle, R.; Mimouni, S.; Caltagirone, Jean‐Paul; Vincent, Stéphane

doi:10.1016/j.compfluid.2014.07.018

Cited by 22 publications

(18 citation statements)

References 21 publications

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“…With these parameters, the obtained final interface thickness is always equal to 5 cells whatever the initial interface diffusion [27,52]. • the domain integrals of potential energies E p,2 = Ω Cρ 2 gydV and E p,1 = Ω (1−C)ρ 1 gydV in fluid 1 and 2 (with g = g ) and the domain integrals of kinetic energies E k,2 = 1 2 Ω Cρ 2 u 2 dV and E k,1 = 1 2 Ω (1 − C)ρ 1 u 2 dV will also be stored at each time step.…”

Section: Methodsmentioning

confidence: 99%

“…Details can be found in [29,47]. The modeling of large interfaces and surface tension forces with the Ishii model is based on a volumetric formulation [27,29,48] taken from [37]. It reads…”

Section: Multi-field Approach (Mfa) 231 a Two-velocity Model For Twmentioning

confidence: 99%

“…This type of two-phase flow modeling was initially designed for a dispersed phase that is represented through an Eulerian variable such as the local concentration of the dispersed phase in the surrounding carrier fluid. However, this EulerEuler model can be extended to large scale and resolved interfaces by introducing a sharpening equation together with the transport of the dispersed phase concentration [27,29]. This sharpening equation is coupled with mass and momentum equations in order to ensure mass conservation to almost zero computer error.…”

Section: Introductionmentioning

confidence: 99%

“…In these three approaches, the standard incompressible Navier-Stokes equations are considered, with an additive specific capillary source term that accounts for the normal jump of constraints at the interface. In the VOF and Level Set, an addi- [27][28][29] or segregated phase modeling [23]. This type of two-phase flow modeling was initially designed for a dispersed phase that is represented through an Eulerian variable such as the local concentration of the dispersed phase in the surrounding carrier fluid.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

“…Details can be found in [29,47]. The modeling of large interfaces and surface tension forces with the Ishii model is based on a volumetric formulation [27,29,48] taken from [37]. It reads…”

Section: Multi-field Approach (Mfa) 231 a Two-velocity Model For Twmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2018

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“…As a first step towards this new approach, we have simplified the general concept by considering the liquid phase as continuous in our simulations. The main results obtained with NEPTUNE CFD are presented in [61][62][63][64].…”

Section: Perspectives: Multifield Approach and Interface Locating Metmentioning

confidence: 99%

Dispersed Two-Phase Flow Modelling for Nuclear Safety in the NEPTUNE_CFD Code

Mimouni

Benguigui

Fleau

et al. 2017

Science and Technology of Nuclear Installations

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The objective of this paper is to give an overview of the capabilities of Eulerian bifluid approach to meet the needs of studies for nuclear safety regarding hydrogen risk, boiling crisis, and pipes and valves maintenance. The Eulerian bifluid approach has been implemented in a CFD code named NEPTUNE CFD. NEPTUNE CFD is a three-dimensional multifluid code developed especially for nuclear reactor applications by EDF, CEA, AREVA, and IRSN. The first set of models is dedicated to wall vapor condensation and spray modelling. Moreover, boiling crisis remains a major limiting phenomenon for the analysis of operation and safety of both nuclear reactors and conventional thermal power systems. The paper aims at presenting the generalization of the previous DNB model and its validation against 1500 validation cases. The modelling and the numerical simulation of cavitation phenomena are of relevant interest in many industrial applications, especially regarding pipes and valves maintenance where cavitating flows are responsible for harmful acoustics effects. In the last section, models are validated against experimental data of pressure profiles and void fraction visualisations obtained downstream of an orifice with the EPOCA facility (EDF R&D). Finally, a multifield approach is presented as an efficient tool to run all models together.

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Simulations of Turbulent Two‐Phase Flows with Phase Change Using a Multifield Approach Combined with LES

Gouénard¹,

Vincent²,

Mimouni³

2022

Fluid Mechanics at Interfaces 1

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Multifield hybrid approach for two-phase flow modeling – Part 1: Adiabatic flows

Cited by 22 publications

References 21 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

Dispersed Two-Phase Flow Modelling for Nuclear Safety in the NEPTUNE_CFD Code

Simulations of Turbulent Two‐Phase Flows with Phase Change Using a Multifield Approach Combined with LES

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