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.

Investigation on an Encircling Pulsed Eddy Current Probe Performance Using COMSOL Multiphysics®

S. Majidnia[1], R. Nilavalan[1], J. Rudlin[2]
[1]Brunel University, London, United Kingdom
[2]TWI ltd, Cambridge, United Kingdom

Conventional eddy current techniques have been used to a great extent for detection of surface breaking defects in conductive materials. However, detection of sub-surface defects is limited due to the single frequency and skin effect phenomena. Pulsed Eddy Current (PEC) techniques overcome these limitations. This work involves modelling of an encircling coil around a steel pipe with and without ...

Design of Multiple Ground System for Maternal Defibrillation - new

A. Jeremic[1], E. Khoshrowshahli[2]
[1]Electrical & Computer Engineering, McMaster University, Hamilton, ON, Canada
[2]Biomedical Engineering, McMaster University, Hamilton, ON, Canada

Although cardiac arrest may be statistically insignificant event financial and more important emotional costs in such cases are quite devastating. In this paper we study the effects of multiple grounding pads. Namely, we believe that by placing multiple pads in the lower abdominal part we would be able to decrease the current density that would be dissipated to fetus and amniotic ...

Tuning Sensitivity to Ectopeptidase Rates in the Rat Hippocampus Using Numerical Simulations - new

Y. Ou[1], S. Weber[1]
[1]University of Pittsburgh, Pittsburgh, PA, USA

We have created and optimized a multiphysics model in COMSOL Multiphysics® software that studies sensitivity to ectopeptidase rates in the rat hippocampus. Ectopeptidases are membrane-bound enzymes whose catalytic domains face the extracellular space (ECS) (Figure 1). They have traditionally been accepted to inactivate peptides from the ECS[1]. Recently, not only can these enzymes activate ...

Designing B-field Coils from the Inside-Out

C.B. Crawford[1], Y. Shin[1], and G. Porter[1]
[1]Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky, USA

Traditionally the design cycle for magnetic fields involves guessing at a reasonable conductor / magnetic material configuration, using FEA software to calculate the resulting field, modifying the configuration, and iterating to produce the desired field. Our method involved solving the classical Laplace equation on regions with imposed boundary conditions, which was implemented ...

Model of an Interdigitated Microsensor to Detect and Quantify Cells Flowing in a Test Chamber

E. Bianchi[1], F. Boschetti[1], G. Dubini[1], and C. Guiducci[2]
[1]Politecnico di Milano, LABS, Laboratory of Biological Structure Mechanics, Structural Engineering Department, MI, Italy
[2]CLSE - Swiss Up Chair -Laboratory of Life Science Electronics, EPFL, Losanna, Swissland

Microfabricated planar interdigitated electrodes can detect and analyze cells or particles giving an impedance-based characterization. This method presents several advantages: real-time detection, label-free analysis, non-invasive sensing, easiness of integration and high-throughput screening. A numerical model of an interdigitated planar micro sensor was realized in order to optimize and pre ...

Electromagnet Shape Optimization using Improved Discrete Particle Swarm Optimization (IDPSO)

R. S. Wadhwa[1], T. Lien[1], and G. Monkman[2]
[1]NTNU Valgrinda, Inst. for produksjons- og kvalitetstek., Trondheim, Norway
[2]FH Regensburg, Regensburg, Germany

The magnetic field gradient produced by an electromagnet gripper head depends on its design. Stochastic Methods offer certain robustness to the design optimization process. In this paper, Improved Discrete Particle Swarm Optimization (IDPSO) searching technique is applied to the shape and magnetic field gradient optimization of an electromagnet head. The magnetic field and forces are ...

稳态磁场对激光熔凝熔池的抑制作用研究 - new

王梁[1], 胡勇[1]

激光熔凝通常被作为材料表面的最终处理工艺,然而激光熔凝处理后,材料表面容易出现高低起伏的波纹,降低了其表面质量。因此,为了在激光熔凝处理后获得平整的表面,同时降低后续机加工所需的成本和时间,本文提出了利用稳态磁场抑制激光所致熔池运动的方法。以固液相变统一模型为基础,建立了考虑热传导、流体运动、相变及电磁场作用的多物理场耦合2D瞬态仿真模型,将洛仑兹力以体积力形式添加到动量方程源项中,并利用移动网格(ALE)的方法在模型中计算了熔池表面的运动形态。通过该模型计算了由稳态磁场引起的熔池中的洛伦兹力与由表面张力引起的Marangoni对流影响熔池表面形貌的相互影响过程以及不同磁场强度下熔池速度场、温度场分布情况。同时,包含激光功率、扫描速度、表面张力温度系数等相关材料属性和工艺参数对熔池表面形貌的影响也进行了仿真分析。通过激光熔凝后试样表面的实际高度扫面图像结果以及温度对比图 ...

FEM-Investigations Of Superconductor/Ferromagnet Heterostructures: A Compliance Test Between Various Models

P. Krüger[1], F. Grilli[1], Y. Genenko[2], and R. Brambilla[2]
[1]Karlsruhe Institute of Technology, Germany
[2]Technical University Darmstadt, Germany, ERSE Spa, Milan, Italy

In recent years, a number of numerical and finite-element-methods in particular - some implemented in COMSOL - have been developed to investigate various properties of superconducting materials. Following converse conclusions by different models regarding similar physical phenomena, the consistency of these models has been of increased interest. In this publication the accordance of an ...

Simplifying A Model Of Short Subsequent Sections Containing A Common Detailed Cross-Section

J. Krah
AkerSolutions, Fornebu, Norway

In COMSOL Multiphysics it is possible to implement and simulate several independent models in parallel. This can be meaningful when the different models are coupled to each other by some kind of interaction. If a part of the geometries is identical in all models, this part can be reduced in that it is implemented in only one of the geometries. In the other geometries only its solution towards ...

High Field Magnetic Diffusion into Nonlinear Ferrimagnetic Materials

J-W. Braxton Bragg[1], J. Dickens[1], A. Neuber[1], and K. Long[2]
[1]Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, TX
[2]Dept. of Mathematics, Texas Tech University, Lubbock, TX

Ferrimagnetic based, coaxial nonlinear transmission lines (NLTLs) provide a means to generate sub-nanosecond risetime pulses (from nano-second input pulses) or megawatt level high power microwave oscillations, depending on the geometry, material, and external bias fields. This investigation uses the commercially available, finite element solver COMSOL to provide insight into pulse behavior. ...