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.

Optimal Control Problem for Unsteady Heat Conduction Equation

M. Hashiguchi
Keisoku Engineering System Co., Ltd., Tokyo, Japan

The present paper constructs optimal control problem for unsteady heat conduction equation and shows a method to adjust the numerical solution of temperature to prescribed objective temperature. The time dependence of the boundary heat flux is parameterized and determined by using optimization method given here. The system of equations are solved by using COMSOL Multiphysics. It was found that ...

Acoustic Simulation for Process Analysis of Sonochemical Reactor

H. Matsumoto
Tokyo Institute of Technology, Tokyo, Japan

We exhibit an application method of the acoustics module for numerical simulation of sound pressure distribution inside/outside a reactor under the indirect irradiation of ultrasounds. Applicability of the sound pressure simulation to design of sonochemical reactor is shown by comparison with experimental results for the process analysis of emulsion polymerization using ultrasounds.

Multiphysics analysis of Cancer therapy using Carbon NanoTube and NIR irradiation

S. Sukuvihar
Keisoku Engineering System Co., Ltd., Tokyo, Japan

Conventional cancer therapy includes surgery, radiotherapy, chemotherapy, hormone therapy etc.. Improved methods to cure cancer are being studied. The special properties of newly improved Carbon Nano Tube are being studied for the cancer therapy. A multiphysics simulation of the cancer therapy using Carbon Nano Tube and Near Infrared Irradiation is done in COMSOL 4.0a, to help the research move ...

Study of how electromagnetic characteristics of human abdomen affects B1+ distribution on 3T MR Imaging

A. Nabetani
GE Healthcare Japan Corporation, Japan

It was studied how the permittivity and the conductivity of humans had influence on the transmit B1 magnetic field distribution in the abdominal region. It was also studied how these electromagnetic characteristics affected the static RF shimming which is defined as RF shimming by applying amplitude scaled and phase shifted version of essentially the same RF signal to multiple transmit elements.

Driving Method of Microtool by Horizontally-arranged Permanent Magnets for Single Cell Manipulation

F. Arai
Nagoya University, Nagoya, Japan

This paper presents two innovative driving methodologies using magnetically driven microtools for precise cell manipulations and its automation systems. The new driving methodologies are introduced and backed up with FEM analysis using COMSOL and the experimental results. The positioning accuracy improves 3-10 times and the following response become 10 times higher.

Excitation, Propagation, and Focusing of Surface Plasmon Polaritons around A Pair of Subwavelength Holes on Silver Thin Film

Y. Oshikane
Osaka University, Osaka, Japan

Simulation results regarding excitation, propagation, and focusing of SPP waves around a pair of subwavelength holes on silver thin film by COMSOL Multiphysics + RF Module are presented. This research has been performed for development of a novel tiny spot of extremely intensified optical near-field at the apex of optical fiber probe for scanning near-field optical microscope.

Flexible MEMS Actuated Display System and Modeling Optimization

G. Tortissier[1], C.-Y. Lo[2], H. Fujita[1], and H. Toshiyoshi[1,3]
[1]LIMMS/CNRS-IIS(UMI-2820), Institute of Industrial Science, The University of Tokyo, Tokyo, Japan
[2]Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Taiwan
[3]Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan

Previous works on MEMS actuated Fabry-Perot interferometer (FPI) highlighted promising results for flexible display applications. Three primary color pixels have indeed been obtained using both photolithography and Roll-to-Roll printing process with satisfying color purity and transmittance. However both of these processes are expensive and time-consuming for preparing micropatterns. For these ...

MEMS RF Switch For CPW Circuits

G. Umesh[1], P. Bhat[2], and M.S. Bhat[2]
[1]Physics Dept., NITK Surathkal, Mangalore, Karnataka, India
[2]Dept. of E&C, NITK Surathkal, Mangalore, Karnataka, India

We have simulated a capacitive MEMS switch for application to Coplanar Waveguide (CPW) circuits using COMSOL Multiphysics. The switch configuration involves a pair of metal bridges over the CPW line designed for operation in the Ka - Band frequencies. It is shown that the operating frequency of the switch can be tuned by adjusting the gap between the two bridges. Estimation of the switch ...

Modeling of Freeze-Drying of Coffee Solution using Arbitrary-Lagrangian-Eulerian (ALE) Method

C. Anandharamakrishnan, R. Deepak, N. Chhanwal, and K.S.M.S. Raghavarao
CFTRI, Mysore, Karnataka, India

Freeze-Drying is used widely in the food and pharmaceutical industries for its ability to dry thermolabile product and retain high quality. Freeze-drying involves three stage processes such as (i) freezing, (ii) primary drying and secondary drying. Modeling of primary drying is a very complex process because of the presence of a moving sublimation front whose position is determined by the heat ...

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