Artigos Técnicos e Apresentações

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.

Long Period Gratings (LPG) in Photonic Crystal Fibres

J.S. Petrovic, V. Mezentsev, and I. Bennion
Aston University

A numerical model of long-period gratings in photonic crystal fibres is presented and illustrated on the example of a grating fabricated by an electric-arc. Resonant modes responsible for the attenuation bands in the transmission spectrum of the grating are identified and a correspondence with a grating in the step-index fibre established. The model is justified by good agreement between ...

Beam Characteristics of Ultrasonic Transducers for Underwater Marine Use

G. McRobbie[1], P. Marin-Franch[2], and S. Cochrane[1]
[1] University of Paisley
[2] Piezo Composite Transducers, Ltd

This paper illustrates how finite element analysis with COMSOL Multiphysics can be used to simulate the mechanical and electrical characteristics of piezoelectric transducers. It also shows how beam transmit plots and performance measurements can be modeled by coupling between a piezo domain and a second domain governed by the wave equation.

Simulation of Blood Flow through the Mitral Valve of the Heart

D.M. Espino[1], M.A. Watkins[1], D.E.T. Shepherd[1], D.W.L. Hukins[1], and K.G. Buchan[2]
[1] University of Birmingham
[2] Aberdeen Royal Infirmary

A two-dimensional FSI model of the mitral valve was generated, using an ALE mesh, where valve closure was simulated using contact equations. The simulation predicted a large vortex behind the anterior leaflet during inflow of blood into the left ventricle, in agreement with MRI scans available in the literature. Leaflet deformations agreed with results from experiments in the literature and ...

Stabilised Finite Element Modelling of Oldroyd-B Viscoelastic Flows

T.J. Craven, J.M. Rees, and W.B. Zimmerman
University of Sheffield

The Oldroyd-B family of viscoelastic fluids are notoriously difficult to model numerically. Standard Galerkin finite element methods are prone to numerical oscillations, and solutions break down as fluid elasticity increases. The situation can be remedied to a certain degree however through the addition of weak stabilisation terms to the Galerkin formulation. We present a stabilised ...

3D Modeling and Simulation of the Electromagnetic and Thermal Properties of Microwave and Millimeter Wave Electronics Packages

J. Ding, and D. Linton
Queen’s University, Belfast

The COMSOL Multiphysics package has been used in this work to model and simulate the electromagnetic and thermal properties of GaAs pHEMT based Monolithic Microwave Integrated Circuits (MMIC), and a multi-chip millimeter wave package including a Low Temperature Co-fired Ceramic (LTCC) antenna array. Embedded shielding ground planes inside the ceramic and silicon carriers have been studied. The ...

Self Heating Effects and Equilibrium Rise Times within Micro Silicon Thermistors Operating Within a Gas Liquid Interface

R.Osborne, and K. Dawkins
University of Birmingham

This paper considers the thermal behaviour of an array of micro-silicon thermistors operating within a liquid/gas interface for fluid level sensing applications. COMSOL Multiphysics has been used to model and simulate the transient multiphysics model and calculate the overall thermal flux, the steady-state condition and time taken to obtain steady thermal balance.

Enhanced Evanescent Near Field Optical Lithography with Embedded Metal Masks

B. Sefa-Ntiri, and P.D. Prewett
University of Birmingham

Simulations of evanescent near field optical lithography (ENFOL) using an embedded metal mask (EMM) show that the resolution and throughput are significantly enhanced over conventional ENFOL, due to the coupling between surface plasmon polaritons and cavity mode excitations. The key role played by surface plasmon polaritons and the necessity for wave vector matching between the incoming ...

Numerical Simulation of an Induction Stirred Ladle

M. Pal1, S. Kholmatov2 and P. Jönsson2
1Centre-University of Wales, Swansea
2Royal Institute of Technology, Stockholm, Sweden

In this paper a simulation model of a laboratory scaled induction ladle is presented. The simulation model so developed will make it feasible to receive information about the fluid flow phenomenon and thermal heat transfer. In order to perform the numerical simulation of the furnace, physical processes involved are expressed as a coupled-nonlinear system of partial differential equations ...

Modelling and Design of the Solid Oxide Fuel Cell Anode

K. Tseronis[1], I. Kookos[2], and K. Theodoropoulos[1]
[1] University of Manchester
[2] University of Patras, Greece

A multidimensional, multicomponent, isothermal and dynamic model has been developed. It simulates the mass transport phenomena taking place in the fuel/air channel, the porous electrodes and the electrolyte of a planar SOFC. It allows prediction of the species composition profiles throughout the SOFC. For the numerical solution of the model equations, the finite element based software ...

The Significance of Coupling in 3D Modelling of Acoustic Wave Propagation in a Cavity Containing Air and Porous Absorbent

L. Kelly, Y.W. Lam, and M. Avis
Research Institute for the Built and Human Environment, University of Salford

This study examines acoustic wave propagation in air and porous media in three dimensions using numerical models; in particular it looks at the significance of the coupling effect between the air and porous layer. The numerical model consist of a layer of air and a layer of porous absorbent which are modelled as equivalent fluid and are characterised by complex characteristic impedance based ...

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