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 of Swelling in Whey Protein Based Gel Systems

M.H. Oztop, and K.L. McCarthy
University of California, Davis, CA, USA

In this study, Whey Protein Isolate (WPI) gels of different thickness were soaked in solutions of pH 7.0 and mass uptake was recorded. A finite element model based on diffusion and deformed mesh application modes in COMSOL Multiphysics was developed. Deformed mesh application mode provided the opportunity to incorporate the moving boundaries. The moving boundaries were solved by introducing ...

Modeling Antibiotic Diffusion in a Microfluidic Biofilm Array to Study Bacterial Responses to Antibiotic Concentrations and Combinations

J. Deng[1], L. Villegas[1], L. Shor[1], A. Vázquez[2], A. Dhummakupt[3], P. Samson[3], and J.P. Wikswo[3]
[1]University of Connecticut, Storrs, CT, USA
[2]Instituto Tecnológico y de Estudios Superiores de Monterrey, Monterrey, Mexico
[3]Vanderbilt University, Nashville, TN, USA

Bacteria within a biofilm typically exhibit higher resistance to antibiotic therapy due to mass transport resistance of the biofilm matrix and/or reduced metabolic activity of cells living within the biofilm interior. The objective of this research was to develop a high-throughput experimental and modeling approach to investigate the effects of colony spacing and concentration on the ...

Design of Novel Lithographic Strategies Through Application of Electromagnetic and Multiphysics Simulations

J.P. Singer, J. Lee, S. Ni, M.A. Gibson, S.E. Kooi, and E.L. Thomas
Massachusetts Institute of Technology, Cambridge, MA, USA

Large area patterning techniques such as interference lithography or self-assembly provide 3D nanoscale structures, but lack arbitrary control over what regions are patterned. 3D direct write (DW) lithographic techniques such as multiphoton lithography (MPL) possess the capability to fabricate nearly arbitrary patterns; however, due to the serial nature of DW, fabrication is slow relative to ...

Fluid Dynamics of Blood Flow During Reperfusion and Post-conditioning

T. Merrill, and A. La Barck
Rowan University, Glassboro, NJ, USA

Reperfusion injury is caused by the rapid restoration of blood flow to oxygen-starved tissue. The model will simulate pulsatile blood flow. A separate 2-dimensional axisymmetric straight tube model will be constructed to simulate the pulsating angioplasty balloon within the flow path. Outlet flow profiles from the straight tube model will then be used as the inlet condition for the ...

Design Optimization of Slotted Waveguide Antenna Stiffened Structures (SWASS)

T. Ha, and R.A. Canfield
Virginia Polytechnic Institute and State University, Blacksburg, VA, US

Design optimization of slotted waveguide antenna stiffened structures (SWASS) is described. SWASS is a multidisciplinary blending of RF slotted waveguide technology and stiffened composite structures technology. Structural analysis and radio frequency (RF) analysis are integrated. A hat-type stiffened panel is modeled to meet the structure and RF requirements. We are motivated by the potential of ...

Using COMSOL with the Adjoint Method for Inverse Problems

A. Emery
University of Washington, Seattle, WA, USA

The standard way of estimating parameters in solving inverse problems is based upon least squares fitting which minimizes the sum of the residuals. Another way of minimizing is based upon the adjoint approach in which the sum of the residuals is augmented by the constraint that the solution satisfies the appropriate algebraic or differential equations. This method involves solving the adjoint ...

Two Dimension Model of Solid Oxide Fuel Cell Using COMSOL

K. Song, and H. Knickle
University of Rhode Island, Kingston, RI, USA

As a promising candidate for future electricity providing, solid oxide fuel cell (SOFC) exhibit high efficiency, quiet operation and near zero emissions. In this work, two 2-dimension models of SOFC are constructed in COMSOL. Model 1 includes porous anode and cathode simulations with a thin electrolyte. The fuel cell is operated isothermally under fixed output voltages of 0.4, 0.6 and 0.8. The ...

Heat Transfer in Beer Bottles As Explained By COMSOL Models

W.M. Clark, R.C. Shevlin, and T.S. Soffen
Worcester Polytechnic Institute, Worcester, MA, USA

In this poster we present experiments and calculations that investigate these claims and demonstrate how COMSOL Multiphysics can be used in an undergraduate student project to illustrate engineering fundamentals. We measured the temperature of water in glass, aluminum, and plastic bottles as a function of time upon cooling in a refrigerator, cooling in ice water, heating in air, and heating ...

Understanding of How Megathrust Earthquakes Affect Volcanoes

Youichiro TAKADA[1]
[1]Kyoto University, Kyoto, Kyoto, Japan

Several volcanic regions in the northeastern Honshu locally subsided in response to the crustal deformation associated with the 2011 Mw 9.0 Tohoku earthquake. High temperature rocks are distributed at shallow depths under these volcanic regions, and we interpret that the localized deformation of such hot regions due to the earthquake fault rupture caused the subsidence. We applied COMSOL ...

Optimization of Post-Heat Treatment for Doping of Metal Oxide Particles

P. Widiatmoko et al.[1]

[1]Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan

Liquid-to-solid route for preparing a doped metal oxide (powder) shows advantage on the homogeneity of the precursor as well as the product. Heat treatment plays important role in the process where the salt of precursor in the liquid reacts to form metal oxide solid particles. Understanding the effect of heat treatment in the doping process will then give great advantages. In the present study, ...

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