Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

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 dielectric–film ...

Analysis of Electroosmotic Flow of Power-law Fluids in a Microchannel(1D)

K. SriNithin[1]
[1]IIT Kharagpur, Kharagpur, West Bengal, India

Electroosmotic flow of power-law fluids in a slit channel(1D) is analyzed. The governing equations are the Poisson–Boltzmann equation, the Cauchy momentum equation, Generalized Smoluchowski equation and the continuity equation are used to get shear stress, dynamic viscosity, and velocity distribution. Simulations are performed to examine the effects of ?H, flow behavior index, double layer ...

DNA Interactions in Crowded Nanopores - new

K. Misiunas[1], N. Laohakunakorn[1], S. Ghosal[2], O. Otto[1], U. F. Keyser[1]
[1]University of Cambridge, Cambridge, UK
[2]Northwestern University, Evanston, IL, USA

The motion of DNA in crowded environments is a common theme in physics and biology. Examples include gel electrophoresis and the self-interaction of DNA within cells and viral capsids. Here we study the interaction of multiple DNA molecules within a nanopore by tethering the DNA to a bead held in a laser optical trap to produce a "molecular tug-of-war". We measure this tether force as a function ...

Design and Simulation of a MEMS Directional Acoustic Sensor

S. L. Pinjare [1], V. S. Nagaraja [1], K. S. Rudresh [1],
[1] Department of ECE , Nitte Meenakshi Institute of technology, Bangalore, Karnataka, India

A Piezoelectric Directional Microphone is demonstrated based on a bio-mimetic design inspired by the parasitoid fly Ormia ochracea using the PiezoMUMPs multi-user foundry. The device simulation was conducted using COMSOL Multiphysics® software which achieves a directional sound field response and frequency band of 3.5 KHz to 4.5KHz. The sensitivity of the device is 3.8nV/pa.

Design and Simulation of a MEMS-Based Flow Sensor Using COMSOL Multiphysics® Software

P. Saikumar [1], Z. C. Alex [1], D. Rajapan [2],
[1] VIT University, Vellore, Tamilnadu, India.
[2] National Institute of Ocean Technology (NIOT), Pallikaranai, Chennai, Tamilnadu, India

A flow sensor based on calorimetric principle is designed using COMSOL Multiphysics® software. The sensor is capable of measuring the velocity from 0 to 1 m/s with a resolution of 0.001m/s. The system works with intrusive type mechanism in which the fluid flows across the sensor and interacts with heating element and sensing unit. Temperature gradient measured across the inlet and outlet sensing ...

Phasefield Modeling of Ferroelectric Materials

Marc Kamlah
Head of the Mechanics of Materials Department, Forschungszentrum Karlsruhe, Germany

Outline of presentation: theory of phase-field modeling of ferroelectric materials parameter identification in free energy density finite element implementation: PDE form weak form periodic boundary conditions: electrical mechanical domain configurations intrinsic and extrinsic contributions to small signal properties ---------------------------------- Keynote speaker's biography ...

Powerful automation and optimization methods for Material- and Process analysis with COMSOL Multiphysics and Matlab

T. Frommelt
SGL Group, Technology & Innovation, Meitingen, Germany

Thomas Frommelt received his PhD in physics in 2007 from the University of Augsburg for experimental work and simulation analysis on acoustically driven microfluidic mixing. In 2008, he joined the SGL Group and introduced COMSOL Multiphysics as the tool for flexible equation based modelling. Since then, he has focused on carbon material and process simulation employing methods of optimization ...

3D Stationary and Temporal Electro-Thermal Simulations of Metal Oxide Gas Sensor Based on a High Temperature and Low Power Consumption Micro-Heater Structure

N. Dufour[1], C. Wartelle[2], P. Menini[1]
[1]LAAS-CNRS, Toulouse, France
[2]Renault, Guyancourt, France

The aim of this work was to simulate the electro-thermal behavior of a micro-hotplate used as a gas sensor, in order to compare the obtained results with a real structure. The structure has been designed in 3D and a stationary and a temporal study has been realized.

Nanoscale Structure Design in EM Fields Using COMSOL Multiphysics

J. Yoo[1], H. Soh[2], J. Choi[3], S. Song[4]
[1]Department of Mechanical Engineering, Yonsei University, Korea
[2]Hyundai Motor Co., Korea
[3]Samsung Electronics Co., Ltd., Korea
[4]Mando Co., Korea

Nanoscale structural analysis and design is presented. All the simulations are carried out using a finite element solver and optimization is performed using parameter and topology optimization schemes. It is concluded that COMSOL is effective for analysis and design of nanoscale structure design in electromagnetic field and it may be combined with several optimization methods to improve system ...

Design Optimization of Piezoelectric Micro-machined Modal Gyroscope

Shambhu Singh[1], Dr. N N Sharma[1]
[1]Birla Institute of Technology and science, Pilani, Rajasthan, India

A solid state Piezoelectric Micro Machined Modal Gyroscope is a vibratory type of gyroscope which sense the motion by voltage induced due to Coriolis force. It utilizes natural frequency of the structure to maximize the displacements and hence maximizing the induced voltage signals for sensing.The mode suitable for gyroscopic motion is 9th mode, which was found to be vibrating at 350.217 kHz. A ...