Prof. Fadl Moukalled
Department of Mechanical Engineering
American University of Beirut
Fadl Moukalled received his PhD degree in Mechanical Engineering from Louisiana State University in 1987. During that same year he joined the Mechanical Engineering Department at the American University of Beirut where currently he serves as a Professor. His research interests cover several aspects of the finite volume method and its use in computational fluid dynamics. A founding member of the CFD Group at AUB, he worked on convection schemes, pressure based segregated algorithms for incompressible and compressible flows, adaptive grid methods, multigrid methods, transient schemes for free surface flows, multiphase flows, and fully coupled pressure based solvers for incompressible, compressible, and multiphase flows.
Prof. Abdullah Kharicha
Lehrstuhl für Simulation und Modellierung Metallurgischer Prozesse
Effects of Coriolis and centrifugal forces on the natural convection
The horizontal centrifugal casting is a metallurgical process, in which a liquid metal is poured inside a horizontally rotating cylindrical mold. The centrifugal force pushes the liquid metal towards the mold wall resulting in a formation of a sleeve with a uniform thickness. The mold gradually extracts the sensible and the latent heat from the sleeve, which eventually becomes solid. The main aim of the present study is to investigate the flow established by a fluid inside this partially filled cylinder when the cylinder rotates about a horizontal axis of rotation. For this a 3D model was built in which the fluid flow is described by the Navier-Stokes (N-S) equations and the continuity equation in the cylindrical coordinates. The pressure term in the N-S is decomposed into the hydrostatic and the non-hydrostatic pressure. At the free-surface a kinematic boundary condition is applied. The convective term is discretized using the Lagrangian trajectory reconstruction. Firstly, only the hydrostatic flow is solved by omitting the non-hydrostatic pressure term. Afterwards, the Poisson equation was solved for the non-hydrostatic pressure. Finally, velocity fields and the free-surface position were corrected. In addition to the fluid flow, the heat advection-diffusion equation together with the solidification represented by a stiff source term was solved. Due to the density differences the natural convection takes place, which can be included by incorporating the baroclinic pressure in the N-S equations. Numerical model has been successfully verified against measurements from experiments done with a transparent material. We use the model to investigate the thermo-solutal convection with/without solidification in the horizontal centrifugal casting process. The process studied is subject to extremely strong acceleration in the order of 120G. Although the liquid metal height is only in the order of 2 cm, the Rayleigh number exceeds 1012. In addition, in the cylindrical configuration the action of the Coriolis force is sensitively different than in well-known spherical configuration. It generates jets in the azimuthal direction, similar to the well-known Jet-stream in the upper atmosphere. It is shown that these jets are strong enough to disturb and fragment the already solidified layer
Dr. Abdellah Kharicha obtained his PhD degree from Grenoble Institute of Technology, France, in 2003. Since 2005, Dr. A. Kharicha is a group leader at the Chair for “Simulation and Modelling of Metallurgical Processes” at Montanuniversität Leoben Austria. He has more than 15 years of experience in simulations of Magneto-hydrodynamic fields during melting/solidification processes by either using professional software packages like Fluent, but also in developing own numerical approaches especially on the generation of eddy current and on dendritic growth during solidification. He worked on “Corrosion and mass transfer in Pb-Li blankets for future Fusion reactors”, “Buoyant convection in the HCLL blanket in a strong and uniform magnetic field”, “Multi-phase simulation of the Electroslag-remelting process”, and “Modelling of the large scale ESR processes”. Aside of MHD related topics, Dr. A. Kharicha worked on the hydrodynamics through Dendritic Structures, on modelling of liquid film sheared by a gas flow, on strongly rotating liquid film, and on the Interaction between Melt Flow and Solidification.
Prof. Luca Mangani
Fluid mechanics and hydro-machines department
Lucerne University of Applied Sciences and Arts
Luca Mangani received his PhD degree form the University of Florence in 2006, where he worked on the development of a state-of-the-art turbo machinery code in OpenFOAM® for heat transfer and combustion analysis. After three years of post-doc work, he joined the Lucerne University of Applied Sciences and Arts as Senior Research and chief engineer for CFD simulations. Since 2014 he is serving as an Associate Professor at the fluid mechanics and hydro-machines department, where he manages a variety of projects with industrial partners aimed at developing advanced and novel CFD tools. His research interests include pressure and density-based solvers, segregated and fully coupled algorithms, fluid-structure interaction (FSI), turbulence, and conjugate heat transfer modeling.
Prof. Djamel Lakehal
CEO ASCOMP AG; Lecturer ETH Zurich; Affiliate Researcher MIT
Progress on FV-based Multiphase-flow Algorithms or CMFD & their Industrial Applications
The ability to predict the motion and the physics of multi-phase flow systems with or without heat and mass transfer is essential for refining the design of various industrial processes, in both conventional and novel technologies. In practical applications, the flow may involve phenomena acting at different time/length scales. At each level of the scale cascade, the physics of the flow is amenable to numerical prediction by scale-specific strategies. Particles, interfaces, mixtures need to be resolved with specific approaches, and so is the case as to their interaction with turbulence. We will show how Finite-volumes based Computational Fluid Dynamics and Computational Multi-Fluid Dynamics (CFD or CMFD) are (and will) playing an extremely important role to respond to particular design needs and technology challenges. We will proceed by highlighting the main differences between the various existing predictive techniques, their strengths and deficiencies, before evoking new routes for transcending the classical approaches. We then report on recent advances made in predicting complex and multi-phase flows for both conventional and new technologies, including e.g. microfluidics devices, conventional and renewable energy sectors, chemical and process engineering, including the design of innovative processes plants. Examples will include desalination heat exchangers, chemical reaction in automotive catalysis systems, convective-radiative-conductive heat transfer in solar panels and natural convection in solar towers, multiphase flow separation. We will also show examples of simulations of single and multiphase flow processes through porous media in relation with Carbon sequestration, CCS, and Enhanced Oil Recovery, EOR.
Djamel is the CEO of ASCOMP AG Switzerland & ASCOMP Inc. USA. He is also appointed as an Affiliate Research Scientist at the MIT (USA), and acts as an adjunct lecturer at ETH Zurich and ENS Paris France. Djamel studied mechanical engineering, and obtained his M.S. in Fluid Mechanics from Ecole Centrale of Nantes, France in 1991, and his PhD in December 1994. In the period 1995-1997, he collaborated with Prof. W. Rodi at the University of Karlsruhe as a post-doctoral researcher. As a Research Associate at the Institute of Fluid Mechanics at TU-Berlin (1997-1998), he collaborated with Prof. F. Thiele. In 1998 he joined the Institute of Energy Technology of the ETH Zurich as a Group Leader and Senior Lecturer. He initiated the creation of the Computational Multi-fluid Dynamics Group, hosting doctoral and post-doctoral scientists, performing cutting-edge research in computational multi-fluid flows. In June 2004 he was awarded the French Habilitation Degree jointly from the Ecole Centrale of Lyon and ETH Zurich. In January 2004, he founded ASCOMP, a Company specialized in industrial fluid dynamics and heat transfer for energy-related technologies. Dr Lakehal was hosted as invited Professor in various universities, including MIT, KTH Stockholm, UC Sta Barbara, ENS Cachan Paris, and Imperial College London. Dr Lakehal acts as a reviewer of research projects for the EU (DG Energy), and the US DOE. He authored about 70 journal papers and more than 120 conference papers in various areas related to fluid mechanics and heat transfer.