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.

Modeling Energy Harvesting From Membrane Vibrations in COMSOL

R.K. Kapania, R.C. Singh, and C. Sultan
Virginia Polytechnic Institute and State University, Blacksburg, VA, USA

This paper presents an ongoing effort, motivated by developing self-contained sensors for structural health monitoring of inflatable structures, to model the process of extracting useable electrical power from the mechanical vibrations of thin, prestressed membrane structures. Energy harvesting from mechanical vibrations of these structures may provide enough power to operate both the sensors as ...

Characterization of an AlGaN/GaN Electrostatically Actuated Cantilever Using the Finite Element Method

N. DeRoller, M. Qazi, J. Liu, and G. Koley
University of South Carolina, Columbia, SC, USA

AlGaN/GaN heterostructures are unique because the 2DEG at the interface is created by the difference in polarization properties of the AlGaN and the GaN layers; not due to intentional doping. In this work, a 3D model of an electrostatically actuated micro cantilever has been developed using COMSOL for characterization using the finite element method (FEM). The microcantilever has AlGaN/GaN HFET ...

A Transient Unified Model of Arc-Weld Pool Couplings During Pulsed Spot Gas Tungsten Arc Welding

A. Traidia[1], and F. Roger[2]
[1]AREVA NP, Technical Center, Saint Marcel, France
[2]ENSTA Paristech, Paris, France

Using COMSOL Multiphysics, a finite element model is introduced in this paper to describe the couplings between the welding arc and the weld pool dynamic in pulsed gas tungsten arc welding. The cathode, arc-plasma and melting anode regions are taken into account. The unified time-dependent model describes the heat transfer, fluid flow and electromagnetic fields in the three regions. The ...

Analysis of Acoustic Response of Rooms

J.S. Crompton[1], L.T. Gritter[1], S. Yushanov[1], K.C. Koppenhoefer[1], and D. Magyari[2]
[1]AltaSim Technologies, LLC, Columbus, OH, USA
[2]Golden Acoustics, Detroit, MI, USA

The preferred acoustic response of recording studios, auditoriums and conference halls is to have an even energy response over the entire room and throughout full audio spectrum. This can be accomplished by using acoustic panels with complex surface structures that scatter acoustic waves and diffuse sound level variability over the room volume or through the use of sound absorbing materials to ...

Stefan's Problem: Validation of a One-Dimensional Solid-Liquid Phase Change Heat Transfer Process

D. Groulx, and W. Ogoh
Dalhousie University, Halifax, NS, Canada

A 1D phase change problem, known as Stefan’s problem, for which analytical solutions are available, is solved as a 2D problem using COMSOL Multiphysics. The PCM medium is semi-infinite, initially solid at its melting temperature Tm, and at t = 0, the wall temperature is raised to Tw > Tm, prompting the PCM to start melting, from pure conduction, in a linear fashion starting at x = 0. The ...

Modeling Light Diffraction Using the Finite Element COMSOL

J.D. Bamonte
U.S. Naval Academy, Annapolis, MD, USA

COMSOL is finite element modeling software capable of solving partial differential equations. This capability allows for the modeling of boundary value problems, which is necessary to the study of light and the properties of light propagation. For this study, we are modeling Fraunhofer diffraction of light using a solution of the Helmholtz equation with boundary values appropriate for ...

Failure Stress Analysis of Fiber Reinforced of Composite Laminates under Uniaxial/Biaxial Loading

Z. Hasan[1], F. Darwish[2], and S. Al-Absi[2]
[1]Texas A&M University, College Station, TX, USA
[2]Jordan University of Science and Technology, Irbid, Jordan

The main objective of the present work is to perform stress analysis on composite laminates under unaxial/biaxial loading to serve as a preliminary data for test verification. A detailed calculation based on the Classical Lamination Theory was performed for a laminate. The material used was carbon/epoxy applying a pure uniaxial load followed by a biaxial load. It was observed that the failure ...

Coil Systems to Generate Uniform Magnetic Field Volumes

J.C. Olivares-Galvan[1], E. Campero-Littlewood[1],
R. Escarela-Perez[1], S. Magdaleno-Adame[2], and E. Blanco-Brisset[2]
[1] Universidad Autonoma Metropolitana - Azcapotzalco, Mexico City, DF, Mexico
[2] Cipress No. 88, Col. Las Arboledas, La Piedad, MH, Mexico.

This paper analyzes different types of coil systems to produce volumes of uniform magnetic field. Some types of coil system are presented in this paper such as Helmholtz, Merritt, and Ruben coil systems. In the study coil systems are intended to produce a magnetic flux density of 2µT in the center of the coil. The calculation of the magnetic flux density is done with COMSOL using analytical ...

Simulation of a Magnetophoretic Device for the Separation of Colloidal Particles in Magnetic Fluids

S.K. Fateen, and M. Magdi
Cairo University, Giza, Egypt

Magnetophoresis of non-magnetic particles is the induced motion of non-magnetic particles suspended in magnetic media on the application of a magnetic field gradient. Magnetophoresis can be used in special separation devices to separate colloidal particles based on their sizes. Multiphysics computational programs, such as COMSOL, are ideal for the modeling and simulation of those devices. In ...

Modeling of Transport and Reaction in a Catalytic Bed Using a Catalyst Particle Model

F. Allain, and A.G. Dixon
Worcester Polytechnic Institute, Worcester, MA, USA

A packed bed reactor consisting of spherical catalyst particles in a tube was simulated numerically. The steady-state pseudo-heterogeneous model consisted of a pseudo-continuum representation for the heat and mass transfer in the reactor tube. The reaction source terms were evaluated by explicitly solving a 1D spherical pellet model at each discretization point. The model implemented in COMSOL ...

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