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.

FSI for Coolant Flow in Research-type Nuclear Reactors

F. Curtis[1], K. Ekici[1], and J. Freels[2]
[1]University of Tennessee, Knoxville, TN
[2]Oak Ridge National Lab, Oak Ridge, TN

The High Flux Isotope Reactor, located at the Oak Ridge National Laboratory, is scheduled to undergo a conversion of the fuel used and this proposed change requires an extensive analysis of the flow through the reactor core. The core consists of approximately 500 very thin and long fuel plates through which the coolant (water) flows at a very high rate. Therefore, the design and the flow ...

Making Cartograms and Using them for Data Acquisition

P. Mercure[1], and R. Haley[2]
[1]The Dow Chemical Company, Midland, MI
[2]ATM Research, Midland, MI

We demonstrate cartogram construction, where a geographical map is distorted to represent some measure, for example population, while trying to keep the shape of regions recognizable. We then apply this cartogram construction technique to optimize thermocouple locations. A heat generation and conduction model is used initialize the cartogram construction algorithm. A uniform distribution of ...

Behavioural Change on EM Exposure and its Modelling

K. Singh, N. Kothari, and S. Choudhary
Electronics and Communication Engineering Department
Geetanjali Institute of Technical Studies
Dabok, Udaipur
Rajasthan, India

This paper presents the ill-effects of EM exposure through experiment, simulation and modelling using COMSOL Multiphysics. Biological Effects of microwave radiations on living creatures are studied supported with the practical results.

Xylophone Bar Magnetometry and Inertial-grade MEMS Optimisation: a Multiphysics Approach

H. T. D. Grigg, and B. J. Gallacher
Microsystems Group
Newcastle University
Newcastle upon Tyne
Tyne and Wear, UK

This paper presents ongoing research aimed at development of a MEMS magnetometer capable of nanoTesla sensitivity. Such a device would pave the way for inertial-grade MEMS IMUs. A resonant sensor is proposed, based on a Xylophone Bar sense element, and is analysed both directly and via COMSOL. Mode shapes and frequencies are found as functions of geometric parameters, and the results used ...

Efficient Generation of Surface Plasmon Polaritons with Asymmetric Nano-structures

J. Chen
Peking University
China

This paper covers the following: * All-Optical Light Modulation of surface plasmon polaritons (SPPs) is achieved using asymmetric single nanoslits. A high on/off switching ratio of >20 dB and phase variation of >? were observed with the device lateral dimension of only about 2 ?m. * Efficient unidirectional excitation of SPP as well as beam splitting are achieved using the ...

Methodology for Calculation Scattering Parameters in a Transmission-Line Transducer

E.J.P. Santos[1], L.B.M. Silva[1]
[1]Laboratory for Devices and Nanostructures, Departamento de Eletrônica e Sistemas, Universidade Federal de Pernambuco, Várzea, Recife, PE, Brasil

Transmission-line transducers are used for the measurement of absorption and reflection of different materials, such as: liquids, granular medium, and ground. A simplified methodology for calculation of scattering parameters of such transducers is presented. The transducer cell is partitioned at each interface and the partial scattering equations are calculated, considering two interfaces at a ...

Numerical Aspects of the Implementation of Artificial Boundary Conditions for Laminar Fluid-Structure Interactions

C. Boeckle[1], P. Wittwer[1]
[1]University of Geneva, Geneva, Switzerland

We discuss the implementation of artificial boundary conditions for stationary Navier-Stokes flows past bodies in the half-plane, for a range of low Reynolds numbers. When truncating the half-plane to a finite domain for numerical purposes, artificial boundaries appear. We present an explicit Dirichlet condition for the velocity at these boundaries in terms of an asymptotic expansion for the ...

Humidity Mass Transfer Analysis in Packed Powder Detergents

F. Zonfrilli[1], V. Guida[1], L. Scelsi[1]
[1]Procter & Gamble Italia, Pomezia, Roma, Italy

Powder detergents containing sodium percarbonate and bleach activators undergo chemical decomposition when exposed to high relative humidity. Controlling the moisture intake in finished product packs is therefore a fundamental need in order to guarantee product stability during the whole supply chain. In this paper we show how we have leveraged COMSOL Multiphysics capability in order to model the ...

Simplified Numerical Model of an Axial Impeller

A.-M. Georgescu[1], S.-C. Georgescu[2]
[1]Hydraulics and Environmental Protection Department, Technical University of Civil Engineering, Bucharest, Romania
[2]Hydraulics Department, University “Politehnica”, Bucharest, Romania

We propose a simplified numerical method to model the flow field downstream of an axial impeller. The method can be used for any axial hydraulic machinery for which, one is less interested by the flow between the blades, than by the flow field downstream of the machinery. The method is applied to an axial fan for which the pressure - flow rate curve is available. Numerical results are obtained ...

A Simplified Numerical Model for Simulating Sliding Door and Surgical Staff Movement in an Operating Theater

C. Balocco[1]
[1]Dipartimento di Energetica, Università di Firenze, Firenze, Italy

This paper deals with a numerical investigation on sliding door and people moving effects on the indoor climate of a standard ISO5 class OT with an ultraclean air filter system and a total ceiling unidirectional diffuser. A simple method to analyze the effects on the OT climate by different sliding door conditions combined with crossing persons and persons with a stretcher crossing is provided. ...

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