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.

Platform Isolation Using Out-of-Plane Complaint Mechanisms - new

A. Arevalo[1], E. Rawashdeh[1], I. G. Foulds[2]
[1]Computer, Electrical & Mathematical Sciences & Engineering Division (CEMSE), King Abdullah University of Science & Technology, Thuwal, Saudi Arabia
[2]School of Engineering, University of British Columbia - Okanagan, Vancouver, BC, Canada

This paper reports the structural solid mechanic simulation of a MEMS out-of-plane platform that provides thermal and electrical isolation for a device built on it. When assemble, the platform lifted for approximately 400 μm above the substrate level. A mechanical stress analysis is then presented in order to evaluate the feasibility of building it using commonly used materials in MEMS. Our ...

基于 ALE 方法的脉冲磁体不可逆电感变化计算

蒋帆 [1], 孙衢骎 [1],
[1] 武汉脉冲强磁场中心,武汉,湖北,中国

目前,脉冲磁体广泛采用导体绕组和加固材料分层交替绕制的工艺(内部层间加固),以提高磁体的整体结构强度。磁体在长期的放电工作过程中,反复经历强电磁力的作用,导体材料(一般为纯铜、铜基合金以及铜基复合材料)在重复的加卸载过程中存在着塑性应变的累积效应,即棘轮效应。导体材料塑性应变的逐渐累积,导致了磁体不可逆电感值的不断增加。因此,磁体的不可逆电感变化可表征磁体内部的整体变形情况,可用于脉冲磁体的疲劳失效预测。 本文基于 COMSOL Multiphysics® 5.1 软件,对脉冲磁体的放电过程建立了电路、电磁场、温度场及结构场的二维轴对称全耦合模型。考虑了放电过程中集肤效应对磁体电阻、电感的影响;在结构场中引入了接触对,采用罚函数法对磁体内部的层间分离机制进行了有效的模拟;利用耦合变量,基于 ALE 方法计算了脉冲磁体在服役过程中 ...

Experimental Investigations and Numerical Simulation of Electrothermally Actuated Micro-gripper

B. K. S. Kishor[1], T. Ramesh [1],
[1] NIT Trichy, Tiruchirappalli Tamil Nadu, India.

At the micron-level, thermal actuation exerts larger forces compared to the widely-used electrostatic actuation. To obtain large displacements at low voltage the principle of Electro Thermal actuation is used. It works on the principle of selective non-uniform Joule heating which results in thermal expansion due to constraints. The Microgripper presented here is studied and analyzed by carrying ...

A FEM Study of Displacement Sensor Based on Magnetostrictive/Piezoelectric Composite Material

Qingwei Liu [1], Hangjie Mo [1]
[1] Shanghai Jiao Tong University, Shanghai, China

This paper studies the application of laminate magnetoelectric (ME) material in displacement sensor. We studied the L-L block composite thanks to designed structure by coupling displacement signal with the displacement potential of ME composite. A nonlinear approximation is adapted to modeling magnetostrictive phase and implemented in COMSOL Multiphysics® software. The simulation results ...

Estimation of Hydraulic Conductivity for a Heterogeneous Unsaturated Soil Using Electrical Resistivity and Level-Set Methods - new

T. K. Chou[1], M. Chouteau[1], J. S. Dubé[2]
[1]École Polytechnique de Montréal, Montréal, QC, Canada
[2]École de Technologie Supérieure, Montréal, QC, Canada

The estimation of the soil saturated hydraulic conductivity (Ks) is crucial in understanding water flow and transport of contaminants. There are many hydrological techniques available in determining this parameter (constant head method, in-situ soil analysis, etc...). While these techniques can provide quality data points, they are often limited by sparse data sampling and scale. Therefore ...

Diffusion and Reaction in Fe-Based Catalyst for Fischer-Tropsch Synthesis Using Micro Kinetic Rate Expressions - new

A. Nanduri[1], P. L. Mills[1]
[1]Department of Chemical & Natural Gas Engineering, Texas A&M University, Kingsville, TX, USA

Fischer-Tropsch synthesis (FTS) is a highly exothermic polymerization reaction of syngas (CO+H2) in the presence of Fe/Co/Ru-based catalysts to produce a wide range of paraffins, olefins and oxygenates, often known as syncrude. Multi-Tubular Fixed Bed Reactors (MTFBR) and Slurry Bubble Column Reactors (SBCR) are widely employed for FTS processes. The scale-up of MTFBR is complicated by the ...

Using COMSOL Multiphysics® Software and the Application Builder for Neutron Transport in Discrete Ordinates

C. J. Hurt [1], J. D. Freels [2],
[1] University of Tennessee, Knoxville, TN, USA
[2] Oak Ridge National Laboratory, Oak Ridge, TN, USA

Introduction: The numerical solution to the neutron transport equation is employed to study a variety of problems in nuclear engineering applications, including for both eigenvalue and fixed source studies. Historically, multiphysics analysis at the HFIR has utilized these solutions to include thermal-structural and thermal hydraulic physics with a weak coupling due to the limited ...

A Multiscale Model of the Bipolar Electrode - SDS Adsorption on Stainless Steel

Hörmann, Johannes (何约翰) [1], Meng, Yonggang (孟永钢) [1],
[1] State Key Laboratory of Tribology, Tsinghua University, Beijing, China

In solution, sodium dodecyl sulfate (SDS) (structure shown in Fig. 1) can form a boundary film on metal surfaces. Previous studies have extensively investigated the characteristics of such surfactant films experimentally [1][2][3]. A dependency of SDS surface concentration and film structure on the metal's electric potential has been demonstrated, in aqueous as well as in non-aqueous solutions. ...

Novel Simulation of a Voltage-Driven Electro-Thermo-Mechanical MEMS Self-Oscillator

S. Ouenzerfi [1,2,3], H.A.C. Tilmans [2], S. El-Borgi[3,4], X. Rottenberg [2]
[1] KACST-Intel Consortium Center of Excellence in Nano-manufacturing Applications (CENA), Riyadh, KSA
[2] IMEC, Leuven, Belgium
[3] Applied Mechanics and Systems Research Laboratory, Tunisia Polytechnic School, University of Carthage, La Marsa, Tunesia
[4] Texas A&M University at Qatar, Mechanical Engineering Program, Engineering Building, Doha, Qatar

This paper presents the modeling and simulation of electro-thermo-mechanical self-oscillators, an emerging type of M/NEMS-enabled timing devices in which sustaining electronic amplifiers are not required for their operation. Indeed, they realize amplification in the mechanical domain and feedback by crossing three physical domains: electrical, thermal and mechanical. In a previous work [1], we ...

Extraction of Thermal Characteristics of Surrounding Geological Layers of a Geothermal Heat Exchanger by COMSOL Multiphysics® Simulations - new

N. Aranzabal[1], J. Martos[1], J. Soret[1], J. Torres[1], R. García-Olcina[1], Á. Montero[2]
[1]Technical School of Engineering, University of Valencia, Valencia, Spain
[2]Department of Applied Physics, Politechnical University of Valencia, Valencia, Spain

It has been demonstrated that is possible obtain the thermal parameters of geological layers of a BHE (Borehole Heat Exchanger) by fitting temperature evolution in an observer pipe inserted into borehole.