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.

Influence of Non-Newtonian Blood Viscosity on Wall Pressure in Right Coronary Arteries with Serial Stenoses

B. Liu [1]
[1] Monmouth University, West Long Branch, NJ, USA

Three dimensional mathematical models are developed to simulate the blood flows in patient specific right coronary arteries with two stenoses. Simulations are carried out with various flow parameters under physiological conditions. Both Newtonian and non-Newtonian blood viscosity models are applied in the simulations to examine the influence of non-Newtonian viscosity of blood on the wall ...

Pulsed Electric Field Based Material Removal in Microelectrical Discharge Machining

T. Roy[1],, P. Ranjan[2], , R. Balasubramaniam[2]
[1]Homi Bhabha National Institute, Mumbai, India
[2]Bhabha Atomic Research Centre, Mumbai, India

Micro electrical discharge machining (MEDM), a scaled down version of EDM process, is a micro machining process used to fabricate micro holes and intricate shapes in electrically conductive materials irrespective of its hardness. In this process, an electric spark is generated in the gap between the two electrodes (tool as cathode and workpiece as anode) submerged in dielectric that leads to a ...

微波多模腔金属边界移动对加热的影响研究

于雨田 [1],
[1] 四川大学应用电磁所,成都,中国

本作品通过研究微波炉矩形金属璧的单向移动,实现腔体内电场分布的变化,从而达到调节作用腔体内各点的电场分布的目的。图表1为仿真几何模型示意图,除了腔体内部的小块土豆,其余的腔体材料均为理想导体铜,腔体内为标准大气压下的空气。图表1中300mm*30mm*350mm矩形块的设计是为了更便捷地计算移动后的网格。本次仿真沿x轴正方向向外移动2的外侧面金属壁来实现腔体的移动。端口激励源为TE10模、频率2.45GHz、功率700W、相位为0的微波。图表2为金属壁移动示意图,通过软件的移动网格接口实现移动金属壁的仿真。仿真结果良好,图表3和图表4显示了移动后的输入端口S11值以及土豆加热效果,金属壁移动40mm后,加热物体的加热均匀性提高了14.33%,加热效率提高了38.53%,说明合理地移动微波腔体金属壁可以有效地提高模型的加热均匀性和加热效率。研究结果对工业和科研有着较好的参考意义 ...

A 3D Multiphase Flow Model of Hydrogen Storage in Geological Formations

E. Abarca [1], A. Sainz-Garcia [1], F. Grandia [1],
[1] Amphos 21 Consulting S.L., Barcelona, Spain

Renewable energies generate temporary mismatches between energy demand and supply. The conversion of surplus energy to hydrogen and its storage in geological formations is one option to balance this energy gap. Storage in deep saline aquifers is the most cost-effective option for underground hydrogen storage (Lord et al., 2014). A 3D multiphase flow model in a dome shaped geological formation ...

Electrochemical Machining with Nonsymmetric Suction of Electrolyte Flow

M. Hashiguchi [1], D. Mi [1],
[1] Keisoku Engineering System Co. Ltd., Tokyo, Japan

In electrochemical machining process, it is very important to control electrolyte flow field to remove contamination such as slug, or gas to be generated by the machining process as well as heat control for electrolyte, machining tool and work piece. To reduce the overcut of workpiece, special consideration is also needed for electric potential field within the electrolyte. An ...

Simulation Methods on Virtual Laboratories for Characterization of Functionalized Nanostructures

E. Lacatus [1], G. C. Alecu [2], A. Tudor [3], M. Sopronyi [4],
[1] Polytechnic University of Bucharest, Bucharest, Romania
[2] Groupe Renault, Bucharest, Romania
[3] STAR STORAGE,Bucharest, Romania
[4] National Institute for Laser, Plasma and Radiation Physics, Magurele, Romania
[5] Polytechnic University of Bucharest, Bucharest, Romania

Within the emerging integrative concept of IoT (Internet of Things) and IIoT (Industrial Internet of Things) that are paving the way towards Digital Manufacturing Technologies and the next paradigm shift of Industry 4.0, R&D Laboratories have to be at the forefront of the transformation. Using remotely the existing top R&D Laboratories facilities would become soon common practice, but for now ...

应用于可穿戴设备的拉伸式压电MEMS能量采集器

何启盛 [1],
[1] 上海微系统与信息技术研究所

可穿戴设备是近几年发展最快的电子产品之一,但是目前电池寿命仍然不够长、换电池代价高等问题制约进一步发展。为解决该问题,本文提出一种可拉伸式压电振动能量采集器,通过转化肢体运动的能量直接为设备的供能。该器件由柔性衬底、压电铁磁性悬臂梁以及磁铁组成。当衬底被拉伸,悬臂梁从磁铁上分离,进入高频振动发电状态;当衬底从拉伸状态恢复,悬臂梁被磁铁吸引,再次高频发电。本工作先建立器件 3D 模型,用 COMSOL 结构力学得到的前三阶模态阵型,并和解析计算结果进行对比,阵型函数很相近。采用压电设备和 AC/DC 电路模块进行多物理场耦合:在特征值研究中,分析两次高频振动发电的固有频率和模态;在瞬态研究中,分析器件位移、电压等时域结果,采用对电压求积分的后处理办法计算平均发电效率;还对不同 AC/DC 电阻负载进行参数扫描,找到匹配电阻最大化发电效率。同时采用 AC/DC 无电流磁场模块 ...

Generalized Power Law Model of 3D Blood Flow in Bifurcated Stenosed Artery

Zuhaila Ismail [1],
[1] Universiti Teknologi Malaysia, Malaysia

Stenosis is a localize plaque that cause the vessel wall narrowed and causing an alternation in the flow structure which consequently reduced the fluid flow passing to the other organs and tissues. Previous researchers had proven that the formation of stenosis could disturb the normal hemodynamics in blood rheology. Generalized power law model is the best model describing a narrowing blood ...

Electromagnetic Analysis of Cloaking Metamaterial Structures

E. Furlani, and A. Baev
The Institute for Lasers, Photonics and Biophotonics, University at Buffalo, Buffalo, NY, USA

We study cylindrical and spherical shell structures that have cloaking material properties proposed by Pendry et al. We use 2D and 3D time-harmonic analysis to study the field distribution and power flow for various arrangements of these structures. We have shown that the COMSOL RF solver is well suited for the analysis of cloaking metamaterial structures If cloaking material properties can be ...

Modeling Ion Motion in a Miniaturized Ion Mobility Spectrometer

S. Barth, and S. Zimmermann
Drägerwerk AG & Co. KGaA, Lübeck, Germany

Ion mobility spectrometry provides fast detection of very low concentrations of chemical substances. Simple instrumentation combined with high sensitivity and high selectivity are the advantages of this technique. One well established field of application is the detection of hazardous compounds in air, such as chemical warfare agents, explosives and pollutants. A numerical model based on finite ...