J.S. Petrovic, V. Mezentsev, and I. Bennion
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 ...
G. McRobbie, P. Marin-Franch, and S. Cochrane
 University of Paisley
 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.
D.M. Espino, M.A. Watkins, D.E.T. Shepherd, D.W.L. Hukins, and K.G. Buchan
 University of Birmingham
 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 ...
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 ...
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 ...
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 ...
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.
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 ...
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 ...