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.

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.

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 ...

Finite Element Analysis of Resonant Frequencies in Surface Acoustic Wave (SAW) Devices

G. Scheerschmidt, K.J. Kirk, and G. McRobbie
University of Paisley

This document presents a way to model the resonances for magnetostrictive Surface Acoustic Wave (SAW) devices with the structural mechanics module of COMSOL Multiphysics. Lamb and surface modes were identified by simulation of the frequency response. A first approach was also taken to introduce damping to the model. The results from the model were compared to the data from a real device ...

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 ...

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 ...

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 ...

Numerical Simulation of an Induction Stirred Ladle

M. Pal1, S. Kholmatov2 and P. J├Ânsson2
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 ...

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.

Improved Temperature Standards Using COMSOL Multiphysics

J.V. Pearce
National Physical Laboratory, Teddington, Middlesex

This paper describes the use of COMSOL Multiphysics to evaluate the propagation of the liquid-solid interface in fixed point crucibles, and the resulting temperature distribution throughout the system as the phase transition progresses. This enables a robust identification of the features of the melting curve corresponding to physical phenomena such as the liquidus point, and also enhances the ...

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 ...

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