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.

Conjugate Heat Transfer Analysis On Microchannel Heat Sinks For High Power LEDs

D. Chakravarthii [1]
[1] Universiti Sains Malaysia, Malaysia

Light emitting Diode (LED) has been proved to be the best resource for commercial as well as industrial lighting applications. However, thermal management in high power LEDs is a major challenge in which the thermal resistance (Rth) and rise in junction temperature (TJ) are notable parameters. Heat dissipation in the LED has been partly achieved with the evolution of efficient heat sinks. This ...

Modeling Thermo-Fluid Dynamics of a Processing Unit of the Fast-track Trigger for ATLAS

N. Delmonte [1], P. Cova [1], A. Lanza [2], P. Giannetti [3], A. Annovi [3], S. Daniele [4], ,
[1] University of Parma and Istituto Nazionale di Fisica Nucleare - Sezione di Pavia, Pavia, Italy
[2] Istituto Nazionale di Fisica Nucleare - Sezione di Pavia, Pavia, Italy
[3] Istituto Nazionale di Fisica Nucleare - Sezione di Pisa, Pisa, Italy
[4] University of Parma - Department of Information Engineering, Parma, Italy

We describe the thermal modeling of a crate hosting boards with Associative Memories (AM) designed for the Fast Tracker Trigger (FTK) system of the ATLAS detector at the CERN Large Hadron Collider. FTK is a highly paralleled hardware system designed to provide global tracks reconstructed in the inner detector. The hardware system is based on AM for pattern recognition and fast FPGAs for track ...

Modeling of Nonuniform Magnetisation of a Ferrite Loaded Waveguide

H. V. Dixit [1], A. R. Jadhav [2], Y. M. Jain [3], A. N. Cheeran [1], V. Gupta [2], P. K. Sharma [3],
[1] Veermata Jijabai Technological Institute, Mumbai, Maharashtra, India
[2] Vidyavardhini's College of Engineering and Technology, Vasai, Maharashtra, India
[3] Institute for Plasma Research, Gandhinagar, Gujarat, India

The modelling of a ferrite material is conventionally carried out using the Polder permeability tensor which assumes that the ferrite is saturated by a uniform magnetic field. This assumption is often inaccurate due to the constraints imposed by boundary conditions which renders the magnetic field non-uniform. This work proposes to overcome this by determining the magnetic field through a ...

Numerical Simulation and Thermal Analysis of Tumor in the Human Body

S. Hossain [1], F. A. Mohammadi [1]
[1] Department of Electrical and Computer Engineering, Ryerson University, Toronto, ON, Canada

INTRODUCTION: Abnormalities in local body surface temperature have been recognized as a sign of disease for centuries, much before humans knew about the cause of ailments or of pain [1]. The idea of this work is to use numerical simulation tools to predict the location, size and metabolism of tumor embedded in any outer body organ of human. Idealized thermal data of an organ, modeled either as a ...

生物颗粒光声功率谱的有限元数值模拟研究

李勇 [1], 方晖 [2],
[1] 晋中学院,太原,中国
[2] 深圳大学,深圳,中国

定量分析生物颗粒形态的变化可以为疾病诊断提供依据。例如血红细胞形态的变化常常会伴随有相应的血液疾病[1],细胞的癌变常常伴随有细胞核形态的变化[2]等等。无标记的光学显微成像技术已经可以对生物颗粒的尺度和形状进行直接测量。光声显微成像技术 (PAM) 利用生物颗粒固有的吸光本领,已经可以对单个生物颗粒(如细胞和细胞器)进行成像[3]。 最近,光声流式仪(the photoacoustic flow-cytometry)已经实现了对单个生物颗粒进行连续检测[4]。然而,为了在大量的生物颗粒中快速检测生物颗粒的形貌,最好的方法是并非对其进行直接成像,而是采用高频光声显微技术[5],它的分辨率来源于实际测量与光声功率谱的分析。 光声功率谱分析需要通过计算建模来获取。我们使用 COMSOL Multiphysics® 有限元分析软件的声学模块用来建模 MFC7 细胞核的光声功率谱 ...

Multiphysical Simulation of an Induction Sealing Process for Cups with Laminated Aluminum Foil

C. Hollenbeck [1], Z. Jildeh [1], P. Kirchner [1], T. Rydlewski [1],
[1] Imagine Engineering GmbH, Bergheim, Germany

The filling process of thermoformed cups with food like yogurt is followed by placing a laminated aluminum foil for hermetic sealing on top of the cup. By today’s standards the sealing of the thermoformed aluminum foil with the cup is primarily realized by contact heat with a hot stamp. However this method has tremendous disadvantages. The hot stamp may locally cause a detachment of the color ...

强化传递的空气电极层级结构

周川冀越 [1], 王贵欣[1], 朱铧丞[2],
[1] 四川大学化学工程学院
[2] 四川大学电子信息学院

锂空电池中空气电极是阴极反应的重要场所,空气电极结构设计的好坏极大地影响了锂空气电池的能量效率、倍率性能和循环寿命。为了强化氧气在空气电极中的传递过程,本文对一种层级结构空气电极进行研究:由泡沫铝制成的氧气分布板承载排列有序的碳纳米管阵列,氧气在阵列管中有规律传输、排布、反应。经计算得模拟计算所需的阵列管规格为外径1200、1400、1600nm;管长35000、43000、49000nm。然后绘制出9组数据的空气电极层级结构三维图纸,导入 COMSOL Multiphysics 5.2a 中,运用多孔介质稀物质接口,定义材料后编译域和边界条件,完成网格划分后进行后处理,最终模拟出氧气在空气电极内部传递过程与达到稳态后的氧气分布结果。接着用得到的数据在 Origin 绘图软件上绘制二维与三维柱状图,比较九组数据,发现规格为内径 1300nm ,管长 35000nm ,长径比为 21 ...

单相变压器损耗与温升仿真分析

沙瑞 [1], 韩天衡 [1], 王斌 [1],
[1] 天津工业大学,天津,中国

随着城市用电量的逐年增加,单相变压器连续运行时的损耗发热严重制约了其发展和应用。高温发热会加速绝缘老化和缩短设备使用寿命,甚至导致一系列故障问题,降低设备的可靠性。该问题涉及电-磁-热多物理场耦合,心损耗温升的准确计算至关重要,为此本文基于硅钢片磁化特性的测量数据,考虑铁心磁特性受应力影响,采用 COMSOL Multiphysics 多物理场仿真软件,通过 AC/DC 模块、固体力学模块和传热模块对单相变压器铁心的磁场、应力、损耗和温升分布进行研究。首先施加激励得到铁心磁场及损耗密度分布,最后将损耗值作为温度场的热源,进而计算铁心的温升分布。本研究对单相变压器的优化设计和变压器节能降耗具有重要意义。 Reference [1] 许晖, 尹忠东. 基于有限元法的干式变压器损耗与温升分析[J]. 科技创新与应用, 2014,(18):53. [2] ...

基于 COMSOL 软件的亚大气压针-板放电数值模拟

王宇天 [1], 李益文 [1], 张百灵 [1], 庄重 [1],
[1] 空军工程大学等离子体动力学重点实验室

为了研究纳秒脉冲针-板放电过程电子分布等微观过程,建立了二维对称结构计算模型,开展数值模拟研究,得到了电子数密度、电场强度、电子温度和离子数密度等分布规律以及放电通道的形成过程。研究表明放电通道由针尖处开始向阴极形成,在放电过程中,电子数密度随着电压升高而逐渐增大,达到击穿电压时开始急剧增加,在电压峰值后,随着电压的降低,电子数密度开始逐渐下降,但是开始下降的时间点滞后于电压峰值点,并且电子数下降的速度小于电压降低的速度;电场强度和电子温度先在针电极处达到一个极大值,其后随着时间的推移逐渐减小,最大值始终位于轴线处,放电通道发展到阴极时,阴极表面电场强度和电子温度再次增大;对比了 2500Pa、5000Pa、7500Pa 和 10000Pa 气压下放电击穿过程的特点,发现气压的升高会使得阴极鞘层变薄,并且放电通道向中心轴线收缩,通道变窄,阴极板上的辉光也会向中心收缩。典型条件下 ...

Simulation of Fourth-Order Laterally-Coupled Gratings

R. Millett, A. Benhsaien, K. Hinzer, T. Hall, and H. Schriemer
Centre for Research in Photonics, University of Ottawa, Ottawa, ON, Canada

Distributed feedback lasers improve the performance of standard Fabry-Perot laser designs by including a wavelength-selective grating that provides superior output, spectral purity and temperature stability. Laterally-coupled distributed feedback (LC-DFB) lasers with the use of higher order gratings have a grating that has been patterned out of the waveguide ridge which allows for simplified ...