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.

Level-Set based Topology Optimisation of Convectively Cooled Heatsinks

M. S. Santhanakrishnan [1], T. Tilford [1], C. Bailey [1],
[1] The University of Greenwich, London, United Kingdom

Introduction Thermal management is a key challenge in development of modern microelectronics systems. This is becoming an increasingly critical area of microelectronics packaging design due to the ever increasing levels of miniaturisation, integration and operating frequency which result in significantly higher power densities. This study looks to address this challenge through advanced ...

Local Conduction Heat Transfer in U-pipe Borehole Heat Exchangers

J. Acuna[1] and B. Palm[1]

[1]Department of Energy Technology, KTH, Stockholm, Sweden

The most common way to exchange heat with the bedrock in Ground Source Heat Pump (GSHP) applications is circulating a fluid through a U-formed closed loop in vertical boreholes drilled several tenths of meters into the ground. This study presents and compares the results of eight cross sectional U-pipe Borehole Heat Exchanger configurations. Values from recent experimental temperature ...

Comparison Between Honeycomb and Fin Heat Exchangers

P. Gateau[1], P. Namy[2], and N. Huc[3]
[1]SAS SYNGAS, rue du camp d’aviation, 44320, Saint Viaud, France, paul.gateau@syngas.eu
[2]SIMTEC, 8 rue Duploye, 38100, Grenoble, patrick.namy@simtecsolution.fr
[3]COMSOL FRANCE, WTC, 38000, Grenoble, nicolas.huc@comsol.fr

Metal honeycombs are used as catalyst supports. They can be considered as complex fins for heat exchange. A simple heat transfer model was compared with 2D simulations using COMSOL Multiphysics. There was a good correlation when the fluid temperature was the same in all cells. However, significant discrepancy apperared when compared with a 3D simulation with laminar flow. Honeycomb cells ...

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 ...

Compressible Flow Modelling Applied to Depressurization Process

V. Bruyère [1], T. Paris [2], P. Namy [1],
[1] SIMTEC, Grenoble, France
[2] CEA DAM, Is-sur-Tille, France

In order to predict and optimize the design of pipes and reservoirs during a depressurization process, the gas behavior must be precisely understood. Numerical modeling is an effective tool to study and understand the effect of each gas properties on the gas behavior. Nevertheless, compressible flow modeling still remains quite challenging, especially when the Mach number is close to one. In ...

Modeling the Internal Pressure Distribution of a Fuel Cell

P.A. Koski[1] and M.S. Mikkola[1]
[1]Department of Applied Physics, Helsinki University of Technology, Espoo, Finland

A 3D FEM (Finite Element Method) model for predicting the internal pressure distribution of a fuel cell stack is presented. The model includes contact pair boundary conditions between the most critical components, thermal expansion and Young's moduli as a function of temperature. The model is used to investigate the changes in pressure distribution inside a PEM fuel cell at realistic ...

Virtual Modeling of Thermo-Physiological Comfort in Clothing

P. Van Ransbeeck [1], R. Benoot [1], B. Van Der Smissen [1]
[1] University College Ghent, Faculty of Science and Nature, Department of Mechatronics, Belgium

This publication aims to investigate conjugate heat and mass transfer around a clothed virtual manikin. This research can be performed at different scales: (1) at material scale where a piece of textile is investigated in 1D or 2D space or (2) at system level where a clothed cylindrical body (2D) or a complete manikin (3D) is modeled. The work is based on previous methods and results from ...

Predicting Degradation of a Composite Material Due to an Injected Current

J. Rivenc [1],
[1] Airbus Group Innovations, Toulouse Cedex, France

The purpose of this study is to predict, with a multiphysics model, the degradation area of a composite material when a current is injected into the material. The main physical phenomenon is an exothermic reaction, with an irreversible nonlinear variation of the electrical conductivity. The strategy is presented, in order to perform a computation that correctly takes the physics into account. In ...

基于 COMSOL 的 LEC 法 GaSb 晶体生长仿真

李璐杰 [1],
[1] 中国电子科技集团公司第四十六研究所,天津,中国

采用有限元模拟软件 COMSOL Multiphysics® 对液封直拉法(LEC)生长锑化镓(GaSb)晶体的物理过程进行计算机建模。模拟分析了晶体旋转与坩埚旋转工艺对 GaSb 固-液界面形貌的影响。模拟结果表明,晶体旋转与坩埚旋转工艺将导致强烈的熔体强制对流,并进一步影响固液相变物理过程。上述工艺将分别具有促使凸向熔体的固液界面曲率减小和增大的作用,且同等转速条件下,坩埚旋转对固液界面形貌影响更大。基于上述模拟结果优化了实验中坩埚转速、晶体转速参数,最终获得了近似“平面”形貌的固液界面,由此获得了低位错密度的 GaSb 单晶。

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.