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.

Simulation of Gas Injection with the Level Set Method

J. E. Rivera-Salinas [1], A. Cruz-Ramírez [1]
[1] National Polytechnic Institute - ESIQIE, Department of Metallurgy and Materials, Mexico

The physical mechanisms that operate in gas injection are complex, since the bubble formation at submerged orifices involves a wide range of length and time scales, bubble coalescence occurs, rapid pressure variations around the gas bubble produce the wobbling of the bubble, as well as the high velocities involved in the bubble bursting phenomenon on the free surface, among the others. In this ...

Using COMSOL Multiphysics® Software for Benchmarking Problems in Cell Migration

M. Nickaeen [1], I. L. Novak [1], A. Mogilner [2], B. M. Slepchenko [1],
[1] Richard D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center, Farmington, CT, USA
[2] Courant Institute and Department of Biology, New York University, New York, NY, USA

A recently published conservative algorithm for simulating reactions and transport in moving domains have been extended to models in which cell kinematics are coupled with intracellular dynamics. For this, the method that combines a Eulerian approach with tracking an explicit boundary was linked to FronTier, a robust front-tracking technique. The extended algorithm was validated using a set of ...

Modeling of the Singlet Oxygen Distribution in Photofrin-Photodynamic Therapy of the Plural Cavity

R. Penjweini [1], T. C. Zhu [1], M. M. Kim [1],
[1] Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA, USA

Photofrin-mediated photodynamic therapy (PDT) is used after surgical resection at the University of Pennsylvania to treat the microscopic disease for malignant pleural mesothelioma and to increase survival rate. When Photofrin is exposed to laser light at 630 nm in well-oxygenated tissue, it produces reacted singlet oxygen ([1O2]rx) that kills cancer cells. As [1O2]rx is imperative to PDT ...

Secondary Electron Trajectories in Scanning Tunneling Microscopy

H. Cabrera [1], D. A. Zanin [1], L. G. De Pietro [1], A. Vindigni [1], U. Ramsperger [1], D. Pescia [1],
[1] Laboratory for Solid State Physics, Microstructure Research, ETH Zurich, Zurich, Switzerland

The recently developed technique Scanning Tunneling Microscopy in the Field Emission regime (STM FE) is based on the Russell Young's topografiner technology. The set-up is a no contacting device consisting of a sharp tip approached vertically to a conducting surface at variable distances and biased with a small voltage with respect to the surface. The system builds a junction across which ...

A Novel Wavelength Detection Method Based on Wavelength Absorption in Silicon

K. Zhang [1], Y. Audet [1],
[1] École Polytechnique de Montréal, Montréal, QC, Canada

A new filter-less method of detecting the spectrum based on wavelength absorption in silicon is proposed. Wavelength dependent absorption coefficient produces a unique excess carrier distribution. Thus the wavelength spectral information can be obtained by measuring the photon generated electron-hole pairs as a function of depth. A model built with the COMSOL Multiphysics® software along with ...

Effect of Manufacturing Defects in the Form of Internal Leakages on the Acoustic Performance of Mufflers

D. Neihguk[1], A. Prasad [1]
[1] Mahindra & Mahindra Ltd, Chengalpattu, Tamil Nadu, India

The presence of manufacturing defects in the form of incomplete welding and missing perforated holes leads to internal leakages in mufflers. This results into unintended acoustic impedance modifications as well as the Herschel-Quincke effect. The narrow region acoustics model of COMSOL Multiphysics® software is used to simulate the thermoviscous losses associated with the leakages. The ...

Hydrothemal Carbonization: A Renewable Alternative to Fossil Fuels and Respective Evaluation

P. Kladisios [1], A. Stegou [1], Z. Sagia [1],
[1] National Technical University of Athens, Athens, Greece.

Humanity is faced with an imminent energy crisis. The exponential growth of the human population and the consequential increase of the required energy on a global scale, the dramatic climate change and the exhaustibility of natural resources combined, force us to strive towards a sustainable future. The majority of energy is being produced by fossil fuels, carriers of high density of primary ...

A Novel Free-standing Evanescent Waveguide for Sensing

X. Meng [1], Y. Xin [1], P. French [1],
[1] Department of Microelectronics, Delft University of Technology, Delft, Netherland

Introduction The monitoring of bacteria concentration in drain fluid is the most common way to estimate the success of a colon surgery. However, the lack of efficient method to follow the development of E.coli in drain fluid after surgery is often fatal to the patient. The proposed device can reduce the diagnostic time to a few minutes with a low cost solution. In this investigation, a MEMS ...

Computational Study on Transcutaneous Frontal Nerve Stimulation: Simplification of Human Head Model

E. Salkim [1], A. N. Shiraz [1], A. Demosthenous [1],
[1] Electronic and Electrical Department, University College London, London, UK

I. INTRODUCTION Migraine is a neurological disorder which affects nearly 15% of the population and it has been estimated that the European Community spends about €27 billion in a year. Its symptoms may be categorized as attacks of often severe, throbbing head pain with sensory sensitivity of light and sound. It is mainly related to trigeminal nerve, the supraorbital nerve (SON) and ...

Multiphysics Analysis of Electromagnetic Flow Valve

J. S. Crompton [1], K. Koppenhoefer [1], S. Yushanov [1],
[1] AltaSim Technologies, Columbus, OH, USA

Solenoid valves control fluid flow by using the passage of an electric current to produce a magnetic field that controls the displacement of a pre-tensioned plunger. As the electric current increases, the induced force causes the plunger to move upward against the force exerted by a compression spring. In this way, flow of pressurized fluid through an orifice can be controlled through a coupled ...