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.

基于多物理场耦合方法分析熔盐堆工况

张海黔 [1], 刘国财 [1], 王凯凯 [1],
[1] 南京航空航天大学,南京,中国

熔盐堆是唯一一种以液态为燃料的反应堆,熔盐堆研究不同于其他反应堆。本文采用多物理场耦合方法模拟熔盐堆发生工况时熔盐堆中一些参数的变化[1-4]。我们将反应堆模型简化为一个石墨围成的空腔结构,如图[1a]。为简化计算采用二维轴对称图形,如图[1b]。分别采用流体流动接口中单向流中的湍流模式模拟熔盐流体流动、传热模块中流体传热模拟熔盐传热、传热模块中固体传热模拟石墨传热、稀质传递接口模拟反应堆中先驱核浓度、系数型偏微分方程模拟中子扩散。基于以上五个物理场耦合的情况下对一回路发生失流以及石墨发生膨胀两种工况下研究熔盐堆温度变化及先驱核浓度的变化。结果表明一回路流速减小会导致反应堆温度明显升高,如图[2],流速在5m/s减小到1m/s时温度升高不明显,由1m/s减小变化到0m/s时温度变化呈指数升高。先驱核浓度会随着流速减小先增大后减小,如图[3]。当一回路石墨发生膨胀时 ...

A Simulation App for Determining How Best to Cool a Beer Bottle

J. Richter[1], T. Hilbig[1], C. Schröder[1]
[1]University of Applied Sciences Bielefeld, Department of Engineering Sciences and Mathematics, Bielefeld, Germany

The scope of this project was the creation of a short and comprehensive tutorial for the use of COMSOL® Application Builder for students at the University of Applied Sciences Bielefeld. The tutorial is based on the everyday life “problem” how to cool a beer bottle most efficiently. It shows how to use the most important features and tools (e.g. creating buttons, input fields, methods, generating ...

How Apps Can Support COMSOL Multiphysics® Users?

G. Petrone [1], C. Barbagallo [1],
[1] BE CAE & Test, Catania, Italy

Disposing of easy-to-use COMSOL Multiphysics® app to exploit FE-based simulations represents an important opportunity for people working in several industrial areas – from the electronics to the process engineering. In supplying consultancy services, Engineers at BE CAE & Test propose their Customers to use COMSOL Multiphysics® apps to run parametric models and carry-out predictive analyses ...

Using COMSOL Multiphysics® for Theoretical and Experimental Validation of Critical Properties of Composite Process

A. Häberle [1], P. Fideu [2], A. Herrmann [1],
[1] CTC GmbH, Stade, Lower Saxony, Germany
[2] Airbus Operations GmbH, Hamburg, Hamburg , Germany

During the manufacturing of CFRP components one of the most critical process steps is the vacuum bagging. In this process several layers of material are draped separately over complex part shapes. The specific properties of each material, which are needed for the process (i. e. breather, release property, air tightness), result into a complex overall behaviour with respect to the process ...

Multiphysics Modeling of a Minimally Invasive Tissue Ablation Methodology

J. S. Crompton [1], J. Thomas [1], K. Koppenhoefer [1],
[1] AltaSim Technologies, Columbus, OH, USA

Necrosis of human tissue can typically be obtained by exposure to temperatures below 40°C or above +50°C. However, inherent variability in tissue properties, the complexity of tissue response and dissipation of thermal energy by local perfusion or blood flow can make the development of routine, predictable in-vivo approaches to produce necrosis difficult. Although a number of thermal ablation ...

海底管线周围流场分析

叶智慧 [1], 宁禹强 [1], 陈冬 [1], 张佳亮 [1],
[1] 中国石油大学(北京)

海洋油气开采的过程中,油气在海底通过海底管线进行运输。当雷诺数改变时,海底管线周围的流场也会相应发生改变,因此研究管线周围流场分布对分析管线受力情况至关重要。本文研究了海底管道在层流和紊流的情况下,不同流速,不同的床面粗糙度以及不同位置海底管线等情况进行了建模和分析,绘制了不同情况下流场分布图。计算结果表明:(1)同一位置,不同流速下,海流绕流管线形成的流场不同,当流速超过某一限定值后,会出现涡流。(2)不同位置,相同速度下,海流绕流管线形成的流场有所不同。通过数值模拟,对不同情况下的管线受力情况有了清晰的认识,对工程实际操作可以起到指导作用。 关键词:海底管线;海流力;流型;数值模拟;

High Vacuum Gas Pumping and Boundary Coupling

M. Cavenago
INFN/LNL, Laboratori Nazionali di Legnaro, Legnaro, Italy

Many scientific instruments are based on high vacuum equipment with a gas pressure maintained in the order of 1 Pa or below. The gas flow in the low pressure limit, called the molecular flow regime, is a case of transport with zero viscosity. The ability to solve an integral equation on the boundary with finite elements methods allows us to find the gas densities and flows in the ...

Thermal Design of Power Electronic Devices and Modules

N. Delmonte[1], M. Bernardoni[1], P. Cova[1], and R. Menozzi[1]
[1]Dipartimento di Ingegneria dell’Informazione, University of Parma, Parma, Italy

This work describes a way to apply 3D Finite Element Analysis (FEA) to the thermal design of power electronic modules using simplified geometry models of the system components. The method here presented can overcome the problem of solving equation systems with a very high number of Degrees Of Freedom (DOF) due to complex geometry of a power module.

3-D Finite Element Modeling of Brain Edema: Initial Studies on Intracranial Pressure Using COMSOL Multiphysics®

X.G. Li[1], H. von Holst[1][2], J. Ho[1], and S. Kleiven[1]

[1]Division of Neuronic Engineering, KTH, Stockholm, Sweden
[2]Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden

Brain edema is one of the most common consequences of serious traumatic brain injuries which is usually accompanied with increased Intracranial Pressure (ICP) due to water content increment. A three dimensional finite element model of brain edema is used to study intracranial pressure in this paper. Three different boundary conditions at the end of Cerebral Spinal Fluid (CSF) were used to ...

Study of Artificial Molecular Engines Action Through COMSOL Multiphysics® Program

L. Moro[1], F. Lugli[1], and F. Zerbetto[1]

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

Rotaxanes are a class of molecules recently developed in laboratory that have been heralded as possible molecular motors. The motor is constituted by a linear molecule (thread) and a ring-shaped molecule (macrocycle), which is free to move along the thread, switching between two, or more, energetically stable interaction points (stations). Molecular motors start their functioning far from ...