Prof.
Gérard Liger-Belair
(CNRS)
12/12/2016 09:00
Bubbles in a glass of champagne may seem like the acme of frivolity to most of people, but in fact they may rather be considered as a fantastic playground for any fluid physicist. In a glass of champagne, about a million bubbles will nucleate and rise if you resist drinking from your flute. The so-called effervescence process, which enlivens champagne and sparkling wines tasting, is the result...
M.
Arthur Talpaert
(CEA and Ecole Polytechnique (Paris-Saclay))
12/12/2016 09:45
This talk presents the implementation of the simulation of two-phase flows in conditions of
water-cooled nuclear reactors, at the scale of individual bubbles. To achieve that, we study several models for Thermal-Hydraulic flows and we focus on a technique for the capture of the thin interface between liquid and vapour phases. We thus review some possible techniques for Adaptive Mesh...
Dr
Daniel FUSTER
(Institut D'Alembert, UPMC-CNRS 75005 Paris)
12/12/2016 11:00
In this work we numerically investigate the effect of heat and mass transfer on the dynamic response of gas-vapor bubbles. The numerical solution of the full non-linear 1D equations is compared with the analytical solution of the equations obtained for the oscillation of an spherical gas/vapor bubble in
response of a weak pressure perturbation (linear solution). For a system with known...
Mme
Dena Kazerani
(Laboratoire Jacques-Louis Lions (UPMC, Paris 6))
12/12/2016 11:30
In this work, we present a numerical scheme for solving free surface flows. The free surface is modeled using the level-set formulation. Besides, the mesh is anisotropic and adapted at each iteration. This adaptation allows us to obtain a precise approximation for the free- surface location. In addition, it enables us to solve the time-discretized fluid equation only on the fluid domain. The...
Dr
Sébastien Tanguy
(Institut de Mécanique des Fluides de Toulouse)
12/12/2016 12:00
Studies on two-phase flows are of interest in many fundamental problems and industrial
applications, as the spray formation in internal combustion engine, the bubble formation in heat
exchangers, the fluid management in satellites or space launcher tanks, the spray cooling or the
interaction of bubbles with acoustic waves. The Direct Numerical Simulation is a powerful tool,
which is...
Prof.
Stéphane Zaleski
(Université Pierre et Marie Curie (Paris))
12/12/2016 14:15
We discuss recent developments in the Volume-Of-Fluid (VOF) methods, such as the height
function method for the approximation of the geometry of the interface, the balanced-force
surface tension method, and the methods that conserve mass and momentum at machine accuracy. Applications at high Reynolds number,such as high speed liquid-gas flows, and low Reynolds and low Capillary numbers, are...
Dr
Guillaume Bois
(CEA (Paris-Saclay))
12/12/2016 15:00
The Front-Tracking method has been implemented in TrioCFD and improved over the last
decade. It has been widely used on large parallel architectures to study incompressible two-
phase flows. The permanent increase in computing capabilities allows to perform simulations
of fully turbulent bubbly flows in relatively small periodic domains. This talk will be organized
in two parts. The...
13.
High fidelity anisotropic adaptive FEM towards physical couplings occurring in turbulent boiling
Dr
Elie Hachem
12/12/2016 16:30
We propose in this work an adaptive variational multiscale method for complex multiphase
flows with surface tension: applications to 3D bubble dynamics, turbulent boiling and solid
quenching with experimental comparisons will be presented. A new conservative level-set
method is used to provide a precise position of the interfaces. An implicit implementation of
the surface tension in the...
Dr
François-Xavier Demoulin
(CORIA)
12/12/2016 17:00
DNS[1], LES [2] and RANS [3] modelling of atomization have been developed for the last decade in our
laboratory with a particular attention devoted on the behavior of the interface. In particular model
equations for the liquid-gas surface density have been proposed based on the pioneering work of Borghi
and Vallet [4]. The purpose of this approach is to determine the surface density that we...
Prof.
Rémi Abgrall
(Université de Zürich)
12/12/2016 17:30
Since the celebrated Lax Wendroff theorem, it is known that the right way of discretising systems of hyperbolic
equations written in conservation form is to use a flux formulation. However, in many occasions, the relevant formu-
lation, from an engineering point of view, is not to consider this conservative formulation but one non conservative
form. For example, with standard notations, a...
Dr
Hélène Mathis
(Université de Nantes)
13/12/2016 09:00
We propose a model of liquid-vapor phase transition including metastable
states of the van der Waals Equation of State. The first part of the talk concerns
the thermodynamics model. Following the second principle, the problem boils
down to a minimization problem with constraints of the mixture energy. This
”static” description allows to recover the classical equilibria: pure...
Prof.
Richard Saurel
(Université Aix-Marseille)
13/12/2016 09:45
Conventional models of capillary fluids with phase transition consider linked thermodynamics and capillarity. Such coupling has serious consequences, such as:
- sound propagation, undefined in some critical regions,
- very thin interfaces, causing serious issues in practical computations.
In the present talk an approached based on hyperbolic systems with relaxation is promoted to...
Prof.
Laurette Tuckerman
(Ecole Supérieure de Physique et de Chimie Industrielle (Paris))
13/12/2016 11:00
In 1831, Faraday described the standing wave patterns that form on
the surface of a layer of fluid subjected to periodic vertical vibration.
These waves usually take the form of stripes, squares, or hexagons.
However, other phenomena have been observed numerically, such as
quasipatterns, supersquares, heteroclinic cycles, and oscillons.
Until recently, numerical simulation of Faraday...
Mme
Marie Béchereau
(Ecole normale supérieure de Cachan (Paris-Saclay))
13/12/2016 11:45
Two-fluid extensions of Lattice Boltzmann methods with free boundaries usually consider "microscopic''
pseudopotential interface models. In this paper, we rather propose an interface-capturing Lattice
Boltzmann approach where the mass fraction variable is considered as an unknown and is advected.
Several works have reported the difficulties of LBM methods to deal with such two-fluid...
Dr
Laurent Martin Witkowski
13/12/2016 14:30
The free surface deformation generated by a disk rotating at the bottom of a container partially filled with fluid
is an exciting challenge for numerical simulations. The shape of the free surface has shown surprising
patterns in experiments performed by different research groups. However, for many regimes (non
axisymmetric, dewetted disk, sloshing), an accurate comparison with numerical...
