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Fluids
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Advances in Numerical Methods for Multiphase Flows, Volume II
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Advances in Numerical Methods for Multiphase Flows, Volume II

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Flow of Multi-Phase Fluids and Granular Materials".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 13955

Special Issue Editors

Prof. Stéphane Vincent

E-Mail Website
Guest Editor
Laboratoire MSME, UMR CNRS 8208, Université Paris-Est Marne-La-Vallée, 77420 Marne-la-Vallée, France
Interests: finite volume method; non-isothermal multiphase flow; penalty and augmented Lagrangian methods; interface tracking; real flows; turbulence in heterogeneous environments; multiscale modeling of two-phase flows
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Anthony Wachs

E-Mail Website
Guest Editor
Departments of Mathematics and Chemical & Biological Engineering, University of British Columbia, Vancouver, BC, Canada
Interests: particle-laden flows; granular flows; non-Newtonian fluids; numerical methods; high performance computing
Dr. Davide Zuzio

E-Mail Website
Guest Editor
ONERA/DMPE, Université de Toulouse, 31055 Toulouse, France
Interests: numerical simulation; multiphase flows; interfacial flows; dispersed phase flows; atomization; multi-scale simulation

Special Issue Information

Dear Colleagues,

The main goal of this Special Issue is to bring together developers and users of different numerical approaches and codes to share their experience in the development and validation of specific algorithms for multiphase flows. Both resolved scale interfaces and Eulerian–Eulerian or Eulerian–Lagrangian approaches are of interest. The participants will be encouraged to discuss the difficulties and limitations of the different methods and their pros and cons.

Prof. Stéphane Vincent
Prof. Dr. Anthony Wachs
Dr. Davide Zuzio
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • non-isothermal multiphase flow
  • Eulerian–Eulerian approach
  • numerical methods
  • Eulerian–Lagrangian approach
  • multiscale modeling of multiphase flow

Published Papers (7 papers)

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Research

20 pages, 7658 KiB  
Article
Numerical Modelling of Water Flashing at Sub-Atmopsheric Pressure with a Multi-Regime Approach
by Clément Loiseau, Stéphane Mimouni, Didier Colmont and Stéphane Vincent
Fluids 2023, 8(5), 143; https://doi.org/10.3390/fluids8050143 - 28 Apr 2023
Viewed by 1171
Abstract
The CFD numerical study of the flash boiling phenomenon of a water film was conducted using an Euler–Euler method, and compared to the experiments on the flashing of a water film. The water film is initially heated at temperatures ranging from 34 to [...] Read more.
The CFD numerical study of the flash boiling phenomenon of a water film was conducted using an Euler–Euler method, and compared to the experiments on the flashing of a water film. The water film is initially heated at temperatures ranging from 34 to 74 ∘C (frim 1 to 41 ∘C superheat), and the pressure is decreased from 1 bar to 50 mbar during the experiments. This paper shows that the experiments could not be correctly modelled by a simple liquid/bubble model because of the overestimation of the drag force above the water film (in the gas/droplet region). The generalised large interface model (GLIM), however, a multi-regime approach implemented in the version 7.0 of the neptune_cfd software, is able to differentiate the water film, where liquid/bubble interactions are predominant from the gas region where gas/droplet interactions are predominant, and gives nice qualitative results. Finally, this paper shows that the interfacial heat transfer model of Berne for superheated liquids could accurately predict the evolution of the water temperature over time. Full article
(This article belongs to the Special Issue Advances in Numerical Methods for Multiphase Flows, Volume II)
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28 pages, 34090 KiB  
Article
A Highly Scalable Direction-Splitting Solver on Regular Cartesian Grid to Compute Flows in Complex Geometries Described by STL Files
by Antoine Morente, Aashish Goyal and Anthony Wachs
Fluids 2023, 8(3), 86; https://doi.org/10.3390/fluids8030086 - 28 Feb 2023
Cited by 5 | Viewed by 1508
Abstract
We implement the Direction-Splitting solver originally proposed by Keating and Minev in 2013 and allow complex geometries to be described by a triangulation defined in STL files. We develop an algorithm that computes intersections and distances between the regular Cartesian grid and the [...] Read more.
We implement the Direction-Splitting solver originally proposed by Keating and Minev in 2013 and allow complex geometries to be described by a triangulation defined in STL files. We develop an algorithm that computes intersections and distances between the regular Cartesian grid and the surface triangulation using a ray-tracing method. We thoroughly validate the implementation on assorted flow configurations. Finally, we illustrate the scalability of our implementation on a test case of a steady flow through 144,327 spherical obstacles randomly distributed in a tri-periodic box at Re=19.2. The grid comprises 6.8 billion cells and the computation runs on 6800 cores of a supercomputer in less than 48 h. Full article
(This article belongs to the Special Issue Advances in Numerical Methods for Multiphase Flows, Volume II)
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20 pages, 1766 KiB  
Article
Analysis of Particle-Resolved CFD Results for Dispersion in Packed Beds
by P. Lovreglio, K. A. Buist, J. A. M. Kuipers and E. A. J. F. Peters
Fluids 2022, 7(6), 199; https://doi.org/10.3390/fluids7060199 - 09 Jun 2022
Cited by 1 | Viewed by 1848
Abstract
Dispersion is the spreading of a solute while it is moved by a flowing medium. The study of dispersion in catalytic chemical reactors is fundamental to their design, since dispersion influences the reactant and product transport within the bed. In this paper, longitudinal [...] Read more.
Dispersion is the spreading of a solute while it is moved by a flowing medium. The study of dispersion in catalytic chemical reactors is fundamental to their design, since dispersion influences the reactant and product transport within the bed. In this paper, longitudinal and transverse dispersion of an inert tracer in slender packed beds of spheres and spherocylinders is studied using Computational Fluid Dynamics simulations. The focus is on the analysis of dispersion from full field data. The purpose is to develop a methodology that can later also be used to characterize dispersion from full field experimental data such as MRI measurements. Results obtained by means of particle-resolved CFD simulations are discussed. Spatial distributions and residence times are analyzed and the results are interpreted by comparison to results obtained from 1D and 2D convection-diffusion equations. Full article
(This article belongs to the Special Issue Advances in Numerical Methods for Multiphase Flows, Volume II)
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21 pages, 5723 KiB  
Article
Numerical Study on Pool Boiling of Hybrid Nanofluids Using RPI Model
by Mohammed Saad Kamel, Ahmed K. Albdoor, Saad Jabbar Nghaimesh and Mohannad Naeem Houshi
Fluids 2022, 7(6), 187; https://doi.org/10.3390/fluids7060187 - 27 May 2022
Cited by 1 | Viewed by 1880
Abstract
The performance of deionized (DI) water and hybrid nanofluids for pool boiling from a horizontal copper heater under atmospheric pressure conditions is numerically examined in the current study. The Eulerian–Eulerian scheme is adopted with a Rensselaer Polytechnic Institute (RPI) sub-boiling model to simulate [...] Read more.
The performance of deionized (DI) water and hybrid nanofluids for pool boiling from a horizontal copper heater under atmospheric pressure conditions is numerically examined in the current study. The Eulerian–Eulerian scheme is adopted with a Rensselaer Polytechnic Institute (RPI) sub-boiling model to simulate the boiling phenomena and predict the heat and mass transfer in the interior of the pool boiling vessel. This paper attempts to correct the coefficient of the bubble waiting time (BWTC) in the quenching heat flux partition as a proportion of the total heat flux and then correlate this coefficient to the superheat temperature. The pool boiling curve and pool boiling heat transfer coefficient (PBHTC) obtained for the present model are verified against experimental data from the literature and show good agreement. In addition, this work comprehensively discusses the transient analysis of the vapor volume fraction contours, the vapor velocity vectors, and the streamlines of water velocity at different superheat temperatures. Finally, for BWTC, new proposed correlations with high coefficients of determination of 0.999, 0.932, and 0.923 are introduced for DI water and 0.05 vol.% and 0.1 vol.% hybrid nanofluids, respectively. Full article
(This article belongs to the Special Issue Advances in Numerical Methods for Multiphase Flows, Volume II)
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15 pages, 1782 KiB  
Article
Gas-Solid Heat Transfer Computation from Particle-Resolved Direct Numerical Simulations
by Mohamed-Amine Chadil, Stéphane Vincent and Jean-Luc Estivalèzes
Fluids 2022, 7(1), 15; https://doi.org/10.3390/fluids7010015 - 30 Dec 2021
Cited by 2 | Viewed by 1566
Abstract
Particle-Resolved simulations (PR-DNS) have been conducted using a second order implicit Viscous Penalty Method (VPM) to study the heat transfer between a set of particles and an incompressible carrier fluid. A Lagrange extrapolation coupled to a Taylor interpolation of a high order is [...] Read more.
Particle-Resolved simulations (PR-DNS) have been conducted using a second order implicit Viscous Penalty Method (VPM) to study the heat transfer between a set of particles and an incompressible carrier fluid. A Lagrange extrapolation coupled to a Taylor interpolation of a high order is utilized to the accurate estimate of heat transfer coefficients on an isolated sphere, a fixed Faced-Centered Cubic array of spheres, and a random pack of spheres. The simulated heat transfer coefficients are compared with success to various existing Nusselt laws of the literature. Full article
(This article belongs to the Special Issue Advances in Numerical Methods for Multiphase Flows, Volume II)
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22 pages, 10772 KiB  
Article
Pore-Scale Simulation of the Interaction between a Single Water Droplet and a Hydrophobic Wire Mesh Screen in Diesel
by Omar Elsayed, Ralf Kirsch, Fabian Krull, Sergiy Antonyuk and Sebastian Osterroth
Fluids 2021, 6(9), 319; https://doi.org/10.3390/fluids6090319 - 07 Sep 2021
Viewed by 2275
Abstract
Recently, the trend towards sustainable energy production and pollution control has motivated the increased consumption of ultra-low-sulfur diesel (ULSD) or bio-fuels. Such fuels have relatively low surface tension with water and therefore, the separation of water from fuel has become a challenging problem. [...] Read more.
Recently, the trend towards sustainable energy production and pollution control has motivated the increased consumption of ultra-low-sulfur diesel (ULSD) or bio-fuels. Such fuels have relatively low surface tension with water and therefore, the separation of water from fuel has become a challenging problem. The separation process relies on using porous structures for the collection and removal of water droplets. Hence, understanding the interaction between water droplets and the separators is vital. The simplest geometry of a separator is the wire mesh screen, which is used in many modern water–diesel separators. Thus, it is considered here for systematic study. In this work, pore-scale computational fluid dynamics (CFD) simulations were performed using OpenFOAM® (an open-source C++ toolbox for fluid dynamics simulations) coupled with a new accurate scheme for the computation of the surface tension force. First, two validation test cases were performed and compared to experimental observations in corresponding bubble-point tests. Second, in order to describe the interaction between water droplets and wire mesh screens, the simulations were performed with different parameters: mean diesel velocity, open area ratio, fiber radii, Young–Laplace contact angle, and the droplet radius. New correlations were obtained which describe the average reduction of open surface area (clogging), the pressure drop, and retention criteria. Full article
(This article belongs to the Special Issue Advances in Numerical Methods for Multiphase Flows, Volume II)
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14 pages, 4919 KiB  
Article
Study of Different Alternatives for Dynamic Simulation of a Steam Generator Using MATLAB
by Cristhian Álvarez, Edwin Espinel and Carlos J. Noriega
Fluids 2021, 6(5), 175; https://doi.org/10.3390/fluids6050175 - 29 Apr 2021
Cited by 2 | Viewed by 2622
Abstract
This work presents the simulation of a steam generator or water-tube boiler through the implementation in MATLAB® for a proposed mathematical model. Mass and energy balances for the three main components of the boiler—the drum, the riser and down-comer tubes—are presented. Three [...] Read more.
This work presents the simulation of a steam generator or water-tube boiler through the implementation in MATLAB® for a proposed mathematical model. Mass and energy balances for the three main components of the boiler—the drum, the riser and down-comer tubes—are presented. Three alternative solutions to the ordinary differential equation (ODE) were studied, based on Runge–Kutta 4th order method, Heun’s method, and MATLAB function Ode45. The best results were obtained using MATLAB® function Ode45 based on the Runge–Kutta 4th Order Method. The error was less than 5% for the simulation of the steam pressure in the drum, the total volume of water in the boiler, and the mixture quality in relation to what was reported. Full article
(This article belongs to the Special Issue Advances in Numerical Methods for Multiphase Flows, Volume II)
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