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.

Numerical Simulation of Acoustic Properties of Porous Metals under High Sound Pressure Level Conditions

B. Zhang [1], X. Wang [1], L. Ni [1]
[1] School of Mechanical Engineering, Ningxia University, China

The sound propagation and absorption properties in porous media under high sound pressure level conditions have been reported elsewhere. Also several analytical and semi-analytical solutions have been developed; however, these solutions are relatively complicated and the provided results are not accurate enough yet. In this work, the simulated results for the study of the sound absorption ...

介质深层充电的电场与热场耦合计算

王 松 [1], [2], 唐小金 [2]
[1] 军械工程学院静电与电磁防护研究所, 石家庄,河北,中国
[2] 北京卫星环境工程研究所, 北京,中国

摘要:在太空高能带电粒子作用下,航天器上存在绝缘介质深层充电的危险。介质内沉积电荷导致局部出现强电场(达到107V/m),有可能造成介质击穿放电。一方面,充电过程与介质电导率密切相关,而电导率受温度影响显著,另一方面,介质中的通电导体发热会影响介质的局部温度,于是有必要综合考虑介质中电场与热场的耦合变化过程。对此,我们建立了考虑电场与热场耦合变化的介质深层充电模型,并采用 COMSOL Multiphysics® 软件,实现了数值求解。结果表明,在一定的空间辐射环境下,考虑热场是十分重要的,热导率会对充电结果产生不可忽视的影响。该模型有利于多因素作用下的航天器介质深层充电评估计算。 1. 引言: 近些年,卫星充放电效应得到了广泛关注和研究[1, 2]。太空高能电子会射入航天器绝缘介质中,因为该介质极低电导率(10-15S/m量级),使得内部沉积电荷难以泄放 ...

Insulator String Design Optimization Using Non-Linear Optimization Techniques

K. Aramugam [1]
[1] Asia Pacific University, Malaysia

Insulator strings are widely used in high voltage transmission lines to mechanically support the line and electrical insulator fixed between line and the tower. Corona discharges may cause a complete failure of an insulator string due to the high intensity of electric field. Applying a corona ring on insulator string is an important approach to decrease the effect of corona. This work analyzed ...

Mobility of Catalytic Self-Propelled Nanorods Modeling with COMSOL Multiphysics®

F. Lugli[1] and F. Zerbetto[1]
[1]Department of Chemistry “G. Ciamician”, Università di Bologna, Bologna, Italy

A small particle or a nano-sized object placed in a liquid is subject to random collisions with solvent molecules. The resulting erratic movement of the object is known as Brownian motion, which, in nature, cannot be used to any practical advantage both in natural systems (such as biomolecular motors) or by artificial devices. If energy is supplied by external source or by chemical reactions, ...

Validation of DNS Techniques for Dynamic Combined Indoor Air and Constructions Simulations Using an Experimental Scale Model

T. van Goch, and A. van Schijndel
Eindhoven University of Technology, Eindhoven, Netherlands

This paper presents a study on the application of Direct Numerical Solving (DNS) techniques using an experimental scale model. COMSOL Multiphysics is promising in solving dynamic heat and air transport. The experiments can be extremely useful as benchmark for CFD codes.

A Multiphysics Approach to Fundamental Conjugate Drying by Forced Convection

M. de Bonis, and G. Ruocco
DITEC, Universitµa degli studi della Basilicata, Campus Macchia Romana, Potenza, Italy

Heat and mass transfer involved in drying is studied by using COMSOL 3.4. The effect of air temperature on the performance of the drying process applied to fresh food slices is scrutinized. COMSOL’s flexible formulation is exploited by using special drying kinetics for the substrate, and by including a treatment of the dependence of the properties upon the residual moisture content. The model ...

Computational Analysis of the Mechanical and Thermal Stresses in a Thin Film PProDOT-Based Redox Capacitor

J. Sotero-Esteva[1], M. Rosario-Canales[2], P. Gopu[3], and J. Santiago-Avilés[3]

[1]Department of Mathematics, University of Puerto Rico at Humacao, Humacao, PR
[2]Department of Chemistry, University of Pennsylvania, Philadelphia, PA, USA
[3]Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, USA

Among the several types of capacitors, the double-layer and redox types have gathered increasing attention to address some of the heavy power demands of modern technology. In redox capacitors, charge is stored chemically via oxidation/reduction processes in the active materials like electroactive polymers (EAPs) or metal oxides. This work investigates the stresses and heat flux of the electrode ...

The Effect of Electrochemical Micro-Milling by Rotating Magnetic Field

H-Y. Shen[1], H-P. Tsui[1], J-C .Hung[1], S-Y. Lin[2], and B-H. Yan[2]
[1]Metal Industries Research and Development Centre, Taichung, Taiwan
[2]National Central University, Chungli, Taiwan

In this work, the process of micro-channels in electrochemical micro-milling by using rotating magnet assisted helical tool is presented. The results show helical tool and Lorentz force of the rotating magnetic field that enhance the renewal of the electrolyte and machining efficiency. The feed rate can be raised under the magnetic field assisted in terms of experimental results; moreover, the ...

A Mixed Boundary Value Problem That Arises in the Study of Adhesively Bonded Structures

R. Malek-Madani, and J.J. Radice
US Naval Academy, Annapolis, MD, USA

The study of deformation of an adhesively bonded sandwich structure reduces to solving the biharmonic equation for the Airy Stress subject to mixed boundary conditions. Because of the nature of the boundary conditions, this boundary value problem does not yield to the standard elementary methods and must be attacked by numerical methods. In this paper we will use COMSOL\'s capability in two ways ...

Coupling of Wired PCB With Microwave Radiation – 3D Simulation and Experimental Valuation

T. D. Bui[1], F. Bremerkamp[2], and M. Nowottnick[2]
[1]Department of Automobile Engineering, Thanh Do University, Ha Noi, Vietnam
[2]Institute of Electronic Appliances and Circuits, Department “Reliability and Safety of Electronic Systems”, University of Rostock, Rostock, Germany

Modern electronic assemblies and printed circuit boards (PCB) with their sensitive structures and elements have to be protected against environmental influences by conformal coating or casting compounds. In this case the main challenge is the simultaneous curing of the polymers and the safekeeping of the electronic elements and structures on the PCB. This implies the investigation of the heating ...

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