Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Thermo-fluid Dynamics Modelling of Hydrogen Absorption and Desorption in a LaNi4.8Al0.2 Hydride Bed

D. Baldissin[1] and D. Lombardo[1]
[1]Compumat S.r.l., Torino, Italy

A two-dimensional mathematical model for the absorption and desorption of H2 in LaNi4.8Al0.2 was developed and experimentally validated. The model is composed of an energy balance, a mass balance and a momentum balance. These differential equations are numerically solved by means of the finite element method using the software COMSOL Multiphysics®. From a comparison between theoretical ...

Modelling and Simulation of Moving Boundaries and Convective Heat Transfer in non-Autogenous Fusion Weld Pools using FEMLAB 3.1

Edstorp, M., Eriksson, K.
University of Trollhättan/Uddevalla, Dep. of Technology, Mathematics & Computer Science, Trollhättan

This article is concerned with the mathematical modelling and simulation of the thermo and fluid dynamics of the molten pool created during an arc fusion welding process with consumable electrodes. Weld pool simulation is a true multiphysics problem in that a model for a typical process such as GMAWis required to incorporate the effects on the transfer of heat and mass that are induced by ...

Stabilized Finite Element Modeling of the Flow Through Porous Medium

Khodabakhshi, G., Parvazinia, M.
Loughborough University, U.K.

The standard Galerkin method employing standard finite elements is not a robust approach for transport problmes exhibiting multiscale behaviour [1]. The elements enriched with bubble functions improve the stability of the solution dramatically. It is shown that basically all of stable methods are derived from particular class of subgrid scale models [2]. To prevent it, multiscale finite ...

FEMLAB Solution of the Creeping Flow Equations for a Particle in Stagnation Point Flows in the Vicinity of a Wall

Pasol, L., Feuillebois, F.
Paris

The fluid velocity and pressure of the floweld around axed spherical particle embedded in an unperturbed axisymmetric creeping flow in the vicinity of a wall is calculated analytically by the method of bipolar coordinates. Results are obtained with a 10-16 precision allowing a comparison with the results from a FEMLAB calculation. Results from the analytical calculation exhibit several cell ...

Finite Element Simulation of the Oscillatory Flow in a Channel with the Heat Transfer through a Hot Bump

Lee, Y.
Dep. of Engineering Sciences, Embry-Riddle Aeronautical University

The present numerical simulation investigates the time-dependent flow driven by the oscillatory pressure gradient in the streamwise direction. An attempt was made to obtain the flow field that is initially stationary and evolves to the purely oscillatory flow with zero mean velocity, and the results after several cycles of oscillation are compared with the long-time analytical solution in the ...

Modeling Flow Through Foam Channels

F. Rouyer, E. Lorenceau, and O. Pitois
Laboratoire de Physique des Matériaux Divisés et des Interfaces, Université Paris-est, Paris, France

We model the liquid transport in foam (i.e. drainage) by unidirectional flow transverse to a triangular planar area that represents channel (i.e. Plateau borders) cross-sections. Partial mobility of the interfaces is obtained balancing the bulk viscous stress with the surface viscous stress and a velocity equal to zero is imposed at the vertices. In liquid foams, the wedges of the channels are ...

Stability Analysis of a Boiling Loop in Space

W. R. Schlichting1, R. T. Lahey Jr.1, M. Z. Podowski1, and T. A. Ortega G?mez2
1Center for Mutliphase Research, Rensselaer Polytechnic Institute, Troy, NY, USA
2Institute for Nuclear & Energy Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany

Boiling systems must be analyzed to determine their stability characteristics. Multiphase system instabilities can be predicted by the use of a one-dimensional drift-flux model. Using this model, an analysis has been performed with the COMSOL code to investigate both linear and nonlinear instability phenomena. In particular, density-wave oscillations in boiling channels were investigated, and, ...

Dynamic Multi-Phase Modelling and Optimisation of Fluid Jet Polishing Process

A. Beaucamp[2], R. Freeman[2], and Y. Namba[1]
[1]Chubu University, Kasugai, Japan
[2]Zeeko Ltd, Coalville, UK

In the Fluid Jet Method, a polishing fluid is compressed and delivered through a nozzle, allowing the spot area to become continuously replenished with abrasives and coolant. Process parameters include: Abrasive type and concentration, Inlet pressure, Nozzle diameter, Impingement angle, Surface feed of spot. The simulation uses COMSOL’s turbulent 2-phase flow model, with the incompressible ...

Coupled Electric-Thermal-Fluid Analysis of High Voltage Bushing

G. Eriksson[1]
[1]ABB, Corporate Research, Västerås, Sweden

Modern power transmission systems are in general designed to operate at high voltages in order to reduce resistive losses generated by high currents. This, however, tends to increase the risk for dielectric breakdown or flashovers if the equipment is not properly designed to withstand the stress. The present work illustrates how multiphysics simulations can be used to analyze and predict the ...

Helium Two-Phase Flow in a Thermosiphon Open Loop

Bertrand Baudouy
Head of the Cryogenics R&D Group, CEA Saclay, France

Outline of presentation: Missions of SACM (Accelerator, Cryogenics and Magnetism Division) Context : The Large Hadron collider at CERN, Geneva Cooling large superconducting magnet Thermosiphon open loops for cooling superconducting magnets Experimental facility and ranges of the study COMSOL Multiphysics Modeling Results with COMSOL Multiphysics Comparison with experimental ...

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