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.

CMOS Based Atom Chips for Sensor Applications

Ph. Neuman [1], A. Nemecek [1], C. Koller [2]
[1] Department for Micro-and Nanosystems, University of Applied Sciences Wiener Neustadt, Austria
[2] Department for Micro-and Nanosystems, University of Applied Sciences Wiener Neustadt, Austria, and School of Physics and Astronomy, University of Nottingham, Nottingham, UK

Ultra-cold atomic systems have proven over the last decade to be a excellent platform for the realization of quantum sensors, quantum computation or quantum simulation applications. A special implementation of this technology is the so called atom chip, where the magnetic fields generated by wires on a semiconductor chip will result in elaborated trapping potentials for the atomic ensembles. ...

Innovation of Combustion Particle Control Technologies Assisted by Numerical Modeling

D. Rubinetti [1],
[1] Institute of Biomass and Resource Efficiency, University of Applied Sciences and Arts Northwestern Switzerland, Windisch, Switzerland

Worldwide efforts to promote the use of renewable energies include combustion-based technologies that produce substantial amounts of pollutants. In order to control the environmental impact a proper treatment of exhaust gases is required. This study describes the development of a numerical model for an electric filter to cover the interdependent phenomena of Fluid Mechanics, Particle Dynamics ...

Electron Trajectories in Scanning Field-Emission Microscopy

H. Cabrera [1],
[1] Swiss Federal Institute of Technology, Zurich, Switzerland

The Scanning Field Emission Microscopy (SFEM) is a novel technology similar to the better known Scanning Tunneling Microscopy (STM). In STM, electrons are exchanged between the outermost atom of a sharp tip and the outermost atom of a target over sub-nanometer distances by means of the quantum mechanical tunnel effect. When the tip is scanned parallel to the surface, the tunneling current can be ...

Modeling Internal Erosion Processes in Soil Pipes

J. L. Nieber [1], G. V. Wilson [2], G. A. Fox [3],
[1] University of Minnesota, St. Paul, MN, USA
[2] United States Department of Agriculture - Agricultural Research Service National Sedimentation Laboratory, Oxford, MS, USA
[3] North Carolina State University, Raleigh, NC, USA

The erosion of the interior of soil pipes is an important process in the fields of geomechanics and geomorphology. Soil pipes can form in water holding structures like dams and levees, and water flow through these structures becomes concentrated into the soil pipes as they evolve by the process of internal erosion. With time the erosion process will lead to a soil pipe spanning the entire ...


安琪 [1], 潘绍丰 [1], 栾兴龙 [1],
[1] 中国地质大学(北京),材料科学与工程学院

生命现象中存在许多复杂的时空调节机制,以便对一些生物活性因子进行合理分配。其中,最为常见的是动态的时空浓度梯度,即随着时间积累,空间各处浓度将不断地发生变化;这一过程对于生物体来说是十分重要的。 本文受生物体系中,扩散过程中快速可逆的超分子结合作用调控浓度梯度的启发,报道水凝胶材料中快速可逆超分子结合调控物质浓度梯度的概念。在接有环糊精的水凝胶基质中,客体分子偶氮苯的扩散受超分子结合的影响,产生与自由扩散不同的浓度梯度分配。 模拟过程运用了 COMSOL Multiphysics 5.2中化学反应工程下的稀物质传递模块。建立一个长 5mm、宽 2mm、高 0.5mm的三维几何体,作为水凝胶基底的模型。然后将 2*0.5mm 截面的某一面设置为具有恒定浓度的边界,其物质为对氨基偶氮苯,作为对氨基偶氮苯溶液与水凝胶的边界;对氨基偶氮苯的两种顺反异构体与 beta ...

Electro-Thermal Modeling of High Power Light Emitting Diodes Based on Experimental Device Characterization  

T. Lopez[1], and T. Margalith[2]

[1]Philips Research, Aachen, Germany
[2]Philips Lumileds Lighting Company, San Jose, CA, USA

This paper presents a 3D finite element model in COMSOL for the electro-thermal analysis of high power light emitting diodes (LEDs). The proposed model and implementation approach require basic electrical and optical parameters that may be experimentally derived with the aid of advanced post-processing techniques. Extensive experimental validation reveals the capability of the model to ...

Three-Dimensional Simulation of Signal Generation in Wide-Bandgap Semiconductor Radiation Detectors

J. E. Toney[1]
[1]Pennsylvania State University Electro-Optics Center, Freeport, Pennsylvania, USA

We demonstrate the use of Comsol Multiphysics with Matlab to model signal generation in wide-bandgap semiconductor radiation detectors. A quasi-hemispherical detector design is compared with a simple, planar detector. Results show that the quasi-hemispherical design can simply and effectively compensate for the poor hole transport of most compound semiconductor materials.

Using Microwaves for Extracting Water From the Moon

Edwin Ethridge
Senior Materials Scientist, NASA Marshall Space Flight Center

A scientific hypothesis states that cryogenic trapped water is just under the surface of lunar soil at the poles in permanently shadowed craters. Microwave energy can be used to efficiently extract this water from permafrost. COMSOL permits calculation of the heating of simulated lunar soil using measured temperature dependent dielectric properties. Calculations at different microwave ...

Experimentally Matched Finite Element Modeling of Thermally Actuated SOI MEMS Micro-Grippers Using COMSOL Multiphysics

M. Guvench[1], and J. Crosby[1]
[1]University of Southern Maine, Gorham, Maine, USA

In “Micro-Electro-Mechanical-Systems” shortly known as MEMS, one of the most important and effective principle of creating transduction of electrical power to displacement force is thermal expansion. A slim beam of MEMS material, typically Silicon, is heated by the application of electrical current via Joule heating; it expands and creates motion. In the design of many MEMS devices ...

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 ...