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.

Application of the Focused Impedance Method (FIM) to Determine the Volume of an Object within a Volume Conductor

M. A. Kadir[1], S. P. Ahmed[2], G. D. Al Quaderi[3], R. Rahman[2], K. Siddique-e Rabbani[1]
[1]Department of Biomedical Physics & Technology, University of Dhaka, Dhaka, Bangladesh
[2]Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh
[3]Department of Physics, University of Dhaka, Dhaka, Bangladesh

Focused Impedance Method (FIM), a new technique of electrical impedance measurement having high sensitivity in the central region, can sense the change in transfer impedance of an object embedded at a shallow depth within a volume conductor of unchanging background conductivity, using electrodes at the surface. This paper presents a new method for measuring the volume of such an embedded object ...

Transient Finite Element Analysis of a SPICE-coupled Transformer with COMSOL Multiphysics

T. Bödrich[1], H. Neubert[1], and R. Disselnkötter[2]
[1]Technische Universität Dresden, Germany
[2]ABB AG, Forschungszentrum Deutschland, Ladenburg, Germany

The operation of transformers is characterised by strong dynamic interactions between the magnetic system and the electric circuits that are connected to the primary and econdary windings. Transient finite element modelling (FEM) of the transformer with coupling to SPICE circuit models containing the electrical sources and loads is a powerful means for analysis and design. This paper describes ...

Universal Dielectric Response of Atmospheric Ice Using COMSOL Multiphysics®

U.N. Mughal[1], M.S. Virk[1], K. Zaman[1]
[1]Narvik University College, Narvik, Norway

Heterogeneous materials with different phases, are conductive and insulating (dielectric), and are physically present in different natural materials as e.g. atmospheric ice. Jonscher’s proposed ‘universal dielectric response’ is not sufficient for such materials, as it only reflects conductivity as a nonlinear function of frequency, whereas at lower temperatures dipolar vibrations are also ...

Modeling of Resonant Optical Trapping in a 2D Photonic Crystal Cavity

U.P. Dharanipathy[1], N. Descharmes[1], Z. Diao[1], M. Tonin[1], R. Houdré[1]
[1]Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

Photonic crystals (PhC) are optical nanostructures that are widely known for their strong spatial and temporal confinement of electromagnetic radiation. Here, we study the resonant optical trapping of a single nanoparticle within a hollow circular photonic crystal cavity. The Electromagnetic Waves (emw) interface of COMSOL Multiphysics® was extensively used during the analysis of all our ...

Quench Propagation and Detection in a YBCO Racetrack

G. Escamez[1], C. Lorin[1], T. Wu[1], P. J. Masson[1]
[1]University of Houston, Houston, TX, USA

High temperature superconductors (HTS) such as YBCO coated conductors show great promise for future applications where high magnetic fields are needed. The superconducting state only exists under a critical surface defined in the (J,T,B) space. Quench is the process by which a current-carrying superconducting conductor changes rapidly and irreversibly from the superconducting state to the ...

Finite Element Modeling of a Pulsed Eddy Current Probe for Steam Generator Tube Inspection

S. G. Mokros[1, 2], V. K. Babbar[1], T. W. Krause[1], J. Morelli[2]
[1]Department of Physics, Royal Military College of Canada, Kingston, ON, Canada
[2]Department of Physics, Engineering Physics and Astronomy, Queen's University, Kingston, ON, Canada

Steam generator (SG) tubes in CANDU® nuclear reactors can lose efficiency in the presence of corrosion and its by-products. Condition monitoring of support structures could help direct maintenance activities and thereby increase SG tube lifetime. Pulsed eddy current (PEC) has been proposed as a method to non-destructively determine the presence of defects in support structures. COMSOL ...

Characterization of a 3D Photonic Crystal Structure Using Port and S-Parameter Analysis

M. Dong[1], M. Tomes[1], M. Eichenfield[2], M. Jarrahi[1], T. Carmon[1]
[1]University of Michigan, Ann Arbor, MI, USA
[2]Sandia National Laboratories, Albuquerque, NM, USA

We present a 3D port sweep method in a lossy silicon photonic crystal resonator to demonstrate the capabilities of COMSOL Multiphysics® for frequency domain analysis with input and output ports. This method benefits from the advantages of the S-parameter analysis to characterize the input and output coupling into the resonator. By pumping one end of the cavity with a CW plane wave, we are able ...

External Field Induced Flow Patterns in Microscale Multiphase Flows

D. Bandyopadhyay[1], A. Sharma[1], S. Timung[1], V. Tiwari[1], T. K. Mandal[1]
[1]Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India

The study of multiphase flows inside the microfluidic devices has received much attention recently because of its applications in heat and mass transfer, mixing, microreaction, emulsification and most importantly in MEMS and lab-on-a-chip. We study the influence of an electric field on the interfacial morphologies and their transitions, the phenomenon termed electrohydrodynamics. The literature ...

Multiphysics Process Simulation of the Electromagnetic-Supported High Power Laser Beam Welding of Austenitic Stainless Steel

M. Bachmann[1], V. Avilov[1], A. Gumenyuk[1], M. Rethmeier[1]
[1]BAM Federal Institute for Materials Research and Testing, Berlin, Germany

The application of an oscillating magnetic field on the high-power full-penetration laser beam welding process of a 20 mm thick stainless steel plate was numerically and experimentally investigated. In the simulations, three-dimensional heat transfer and fluid dynamics as well as electromagnetics were solved taking into account the most important physical effects of the process, namely the ...

Design and Optimization of Electrostatically Actuated Micromirror

Anna Thomas[1], Juny Thomas[1], Deepika Vijayan[1], K.Govardhan[2]
[1]VIT University, Sensor System Technology, School of Electronics Engineering, Vellore, Tamil Nadu, India
[2]VIT University, MEMS & Sensor Division, School of Electronics Engineering, Vellore, Tamil Nadu, India

The microscopic size of MEMS devices accounts for strong coupling effects which arise between the different physical fields and forces. Micromirrors are essential parts of microswitches in fiber optic network telecommunication. They are usually 1 to 3 mm in size, fabricated from single crystalline silicon and mostly are electrostatically actuated. The objective is to design the micromirror to ...

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