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.

Interactions of Magnetic Particles in a Rotational Magnetic Field

A. Weddemann, A. Auge, F. Wittbracht, S. Herth, A. Hütten
Bielefeld University, Germany

Particle-particle interactions are usually neglected when considering the behaviour of magnetic particle's so called magnetic beads in e.g. a microfluidic device. However, if the particle density exceeds a critical limit, this assumption might not lead to proper results anymore. In this paper the particle-particle interaction of magnetic beads in an external magnetic field will be discussed. It ...

Adaptive Control of Simulated Moving Bed Plants Using Comsol’s Simulink Interface

M. Fütterer
Institut für Automatisierungstechnik, Otto-von-Guericke Universität, Magdeburg, Germany

Preparative chromatography is an important separation method where the simulated moving bed (SMB) technology is an increasingly used separation process for binary mixtures. Several chromatographic columns are arranged in a ring where the feedings and drains are changed cyclically to maintain a continuous separation. For this reason, an adaptive controller is proposed to adjust the flow rates ...

The use of COMSOL for Building Constructions Engineering Regarding Heat and Moisture Transport

H. Schellen, A. van Schijndel, and P. Briggen
Eindhoven University of Technology, Eindhoven, Netherlands

Hunting Lodge St. Hubertus is one of the most prominent Dutch buildings from the early twentieth century. An extensive study of wind and wind-driven rain (WDR) was conducted to provide insight into the moisture load of the building facade, using measurements and CFD simulations. COMSOL Multiphysics was also used for modeling the moisture transport through the walls of the tower. The model ...

Analyzing a Malfunctioning Clarifier with COMSOL’s Mixture Model

A. de Niet, A. van Nieuwenhuijzen, and A. Geilvoet
Witteveen+Bos, Deventer, The Netherlands

Clarifiers are used to separate sludge and water in waste water treatment plants. In this paper we analyze a malfunctioning clarifier using the mixture model. We are able to receive model results that are reasonably close to measurements from the real clarifier. With the model we can explain the bad separation of water and sludge in the clarifier. Engineers have proposed several actions in order ...

Zinc Corrosion in a Crevice

C. Taxén, and D. Persson
Swerea-Kimab, Stockholm, Sweden

Corrosion of metals in confined zones is a big industrial problem. The electrochemistry of such localized corrosion processes is complicated by the impact of the corrosion processes on the composition of the local solution. In the present problem, local interaction with the atmosphere causes uptake of O2 and CO2 and evaporation of water from the initially dilute NaCl-solution. This model ...

Finite Element Models of Elasto-Plastic Deformation in Volcanic Areas

D. Scandura, G. Currenti, and C. Del Negro
Istituto Nazionale di Geofisica e Vulcanologia Sezione di Catania, Catania, Italy

In volcanic areas, the presence of heterogeneous materials and high temperatures affect the rheological behaviour of the Earth's crust that calls for considering the anelastic properties of the medium surrounding the magmatic sources. A thermo-mechanical numerical model is performed for evaluating the temperature dependency of the elasto-plastic solution. Both temperature distributions and ...

The Fabrication of a New Actuator Based on the Flexoelectric Effect

S. Baskaran[1], S. Thiruvannamalai[1], N. Ramachandran[1], F.M. Sebastian[1], and J.Y. Fu[1]
[1]State University of New York at Buffalo, Buffalo, New York, USA

This paper presents a novel methodology towards the design, analysis, and the fabrication process involved in developing a cost effective method to create a piezoelectric actuator by means of the flexoelectric effect. The basic physical equations of the flexoelectric effect and the qualitative analysis of the flexoelectric actuator are done using COMSOL Multiphysics. This effect is used to align ...

Effect of S-p Relation Model on DNAPL Migration Simulation Result

H. Ishimori[1], and K. Endo[1]
[1]National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan

To consider effective counter measures against ground water contaminated with dense non-aqueous phase liquids (DNAPLs) such as chlorinated solvents, it is first important to understand the mechanism of their migration in heterogeneous aquifer. In addition, numerical analysis models to simulate such a complex migration in heterogeneous aquifer are required. The displacement pressure, which ...

Modeling of Nerve Stimulation Thresholds and Their Dependence on Electrical Impedance with COMSOL

P. Krastev[1], and B. Tracey[1]
[1]Neurometrix, Inc., Waltham, Massachusetts, USA

Nerve localization is important for applications in regional anesthesia. Localization is achieved by stimulating the nerve with an electric field produced by a current from a needle inserted into the body of the patient, close to the target nerve.  Modeling of the electric field in close proximity to the nerve may help to explain observed variations in threshold currents and can help to ...

Hydro-Mechanical Response of Sedimentary Rocks of Southern Ontario to Past Glaciations

O. Nasir[1], M.Fall[1], T.S. Nguyen[1,2], and E. Evgin[1]
[1]Department of Civil Engineering, University of Ottawa, Ottawa, Ontario, Canada
[2]Canadian Nuclear Safety Commission (CNSC), Ottawa, Ontario, Canada

The last glacial cycle in the Northern Hemisphere started approximately 120,000 year ago. During that cycle, Southern Ontario was buried under a continental ice cap, with a maximum thickness of up to 3km. The ice cap retreated approximately 10,000 years ago. The COMSOL Multiphysics code is used to model the physical processes of the impact of past glaciations on the evolution of hydraulic system ...