Presentazioni e Articoli Tecnici

In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Underpaint Corrosion Modelling

T. Machado Amorim, and C. Allély
ArcelorMittal Research and Development, Automotive Products Center, Maizières les Metz, France

Underpaint corrosion is one of the most important degradation modes for galvanized steel sheets employed in automotive and building industry. Simplified systems (metal coated with thin polymer layer) under corrosion situations have been studied in the past few years and it is now widely accepted that one of the mechanisms responsible for the paint disbonding is cathodic delamination. In this ...

Modeling of Circulating Nuclear Fuels with COMSOL Multiphysics

A. Cammi, V. Di Marcello, and L. Luzzi
Politecnico di Milano, Department of Nuclear Engineering, Milan, Italy

This paper presents multiphysics modeling of a circulating nuclear fuel in a simple geometry by means of COMSOL Multiphysics.Among the Circulating Fuel Reactors (CFR), the most promising is the Molten Salt Reactor (MSR). Physics of such circulating nuclear fuel requires five coupled equations of conservation laws: the momentum balance, the energy balance, the neutron balance and the precursors ...

Numerical Modeling of a Levitated Liquid in a Cold Crucible

R. Ernst, C. Garnier, P. Petitpas, and C. Trassy
SIMAP-EPM Laboratory (CNRS), Saint Martin d'Hères, France

The cold crucible is a useful tool for the elaboration of high purity materials by electromagnetic fields. The application areas range from titanium part elaboration, for the aeronautic industry or in medical prosthesis, to silicon purification for the photovoltaic industry. In this paper, the main results of a 3D electromagnetic model of a cold crucible from a former paper are briefly ...

FEM Analysis in Sensor Development - Siemens VDO

M. Sas, L. Bizon, and A. Krsjak
Siemens VDO Automotive, Frenstat, Czech Republic

When developing sensors with electrical output in automotive applications, different optimizations are taken into consideration; geometry shape, placement of the sensor, ambient conditions, chemical interaction, material composition, electrical components and their influence, accuracy, response and durability.These parameters and factors are designed, evaluated and simulated by proper CAD/CAE ...

Evaluation of the Moderator Temperature Coefficient of Reactivity in a PWR

V. Memoli, and A. Cammi
Department of Nuclear Engineering, Politecnico di Milano, Milan, Italy

The moderator temperature coefficient (MTC) plays an important role within power thermal reactor dynamics. In order to run a reactor safely, a negative moderator coefficient temperature is necessary to reach stability during changes in temperature that can be caused by a step insertion of reactivity. Thus, MTC calculation is a key point in the reactor design process. The aim of the present work ...

An Optimized Convolutional-Perfectly Matched Layer (C-PML) Absorbing Boundary Condition for Second-order Elastic Wave Equations

O. Bou Matar1,2, E. Galopin1, Y. Li1,2, and O. Ducloux1,2
1Institut d'Electronique, de Micro-électroniqueet de Nanotechnologie, Villeneuve d'Acsq, France
2Laboratoire Européen Associé en MagnétoAcoustiqueNonlinéaire de la matière condensée (LEMAC), Ecole Centrale de Lille, Villeneuve d'Ascq, France

In this study, we extend the Convolution-Perfectly Matched Layer (C-PML) method we have developed for a first order system describing elastic waves in velocity and stress formulation to the same equation written as a second order system displacement.We illustrate the efficiency of this second order Perfectly Matched Layer upon 2D benchmarks with surface waves and Lamb Waves.

A Material Model for Simulating Volume Changes during Phase Transformations

M. Tehler, and S. Jonsson
Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden

The present work describes the first steps in creating a robust material model able to predict volume changes due to thermal expansion and phase transformations.A dilatometer test is simulated starting from room temperature, with an original microstructure constituting a mixture of ferrite and pearlite. During heating, the structure transforms to austenite, which upon quenching will transform ...

A Computational Design Synthesis Method for MEMS using COMSOL

F. Bolognini1, A. A. Seshia1, and K. Shea2
1Engineering Department, University of Cambridge, Cambridge, UK
2Technical University of Munich, Munich, Germany

Computational synthesis methods, used to help designers in the creative phase of the design process, often find an obstacle to their development in the difficulty of finding efficient simulation packages to integrate into the automated search of design solutions.Problems in coupling these search methods with analysis tools arise due to the impossibility of integrating them easily and ...

Mechanical Simulation of Electrical Wafer Sort using PAD Over Active Structures in 0.18μm Smart Power Technology

L. Cecchetto1, L. Zullino1, R. Vallauri1, A. Andreini1, L. Redaelli2, P. Anghilieri2, and R. Vettori2
1STMicroelectronics, Agrate Brianza, Italy
2Technoprobe, Agrate Brianza, Italy

The Electrical Wafer Sort (EWS) process is performed on all electronic devices at the end of the silicon diffusion steps to verify IC functionality. This process is performed by probing ICs with suitable tips on a flat metal surface (PAD).A mechanical simulation feasibility of EWS process is presented here. In most advanced technologies, in order to optimize the area consumption, PAD Over Active ...

Implementation of Hysteresis Material Characteristics in Finite Element Computations

P. Sergeant, and L. Dupré
Department of Electrical Energy, Systems and Automation, Ghent University, Ghent, Belgium

The hysteresis loss in a sample is obtained by evaluating the drag force profile when slowly moving the sample forward and backward through the strong field of a permanent magnet.A numerical time-stepping model is presented that calculates the drag force profile. At every time step, the sample is slightly moved relative to the magnet. The model is based on 2D-FE computations (COMSOL AC/DC module, ...

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