Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

A 1-D Model of the 4 Bed Molecular Sieve of the Carbon Dioxide Removal Assembly

R. Coker [1], J. Knox [1],
[1] NASA Marshall Space Flight Center, Huntsville, AL, USA

Introduction: Developments intended to improve system efficiency and reliability for water and carbon dioxide separation systems to be used on crewed vehicles combine sub-scale systems testing and multi-physics simulations. This paper describes the development of simulations in COMSOL Multiphysics® software in support of the Life Support Systems (LSS) project within NASA's Advanced Exploration ...

Multiphysical Modelling of Keyhole Formation during Dissimilar Laser Welding

I. Tomashchuk [1], I. Bendaoud [1], P. Sallamand [1], E. Cicala [1], S. Lafaye [2], M. Almuneau [2],
[1] Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS - Université de Bourgogne – Franche Comté, France
[2] Laser Rhône-Alpes, Le Fontanil (Grenoble), France

Time-dependent multiphysical simulation of pulsed and continuous laser welding of dissimilar metals, based on Moving Mesh (ALE) approach, is proposed. Strong coupling between heat transfer, laminar compressible flow and ALE is used. The model was validated for a case of single material (Ti6Al4V alloy) and then applied for studying of keyhole dynamics and melted zone development in a case of ...

Change in the Flow Rate Through a Deformed Valve

D. Kekejian[1], Y. Martinez[1]
[1]ITESO, Tlaquepaque, Jalisco, Mexico

In this work, a new design is suggested which functions both as a pipe for fluid transfer and as a valve which decreases the flow of the fluid in the opposite direction in case there are pressure fluctuations in the pipe. Therefore, we call it a "Deformed Valve". To design the structure, we had to use different geometric shapes and calculate the velocity of the fluid for each shape to determine ...

FEM Convergence for PDEs with Point Sources in 2-D and 3-D

M. Gobbert [1], K. M. Kalayeh [2], J. S. Graf [1],
[1] Department of Mathematics and Statistics, University of Maryland - Baltimore County, Baltimore, MD, USA
[2] Department of Mechanical Engineering, University of Maryland - Baltimore County, Baltimore, MD, USA

Numerical theory provides the basis for quantification of the accuracy and reliability of a FEM solution by error estimates on the FEM error vs. the mesh spacing of the FEM mesh. This paper presents techniques needed in COMSOL Multiphysics® software to perform computational studies for elliptic test problems in two and three space dimensions that demonstrate this theory by computing the ...

Model of Pressure Drop Separation during Aqueous Polymer Flow in Porous Media

D. C. Raharja [1], R. E. Hincapie [1], M. Be [1], C. L. Gaol [1], L. Ganzer [1],
[1] Clausthal University of Technology, Clausthal-Zellerfeld, Germany

Aqueous polymers used for enhanced oil recovery (EOR) application is considered a complex fluid. It can exhibit Newtonian and Non-Newtonian behavior depending on the velocity or the stresses that it is submitted during the flooding process. Therefore, the polymer flooding project requires a detailed understanding of chemical and physical process occurred in the porous subsurface reservoir, ...

Numerical Study and Simulation in COMSOL Multiphysics of the Dilution Process during Dust Sampling in Dry Machining

B. Wenga-Ntcheping[1], A. Djebara[1], R. Kamguem[1], J. Kouam[1], V. Songmene[1]
[1]University of Quebec-École de Technologie Supérieure, Montreal, Canada

Dilution’s issue during dry machining have raised the interest’s environmental researchers and engineers. In fact, the sampling of dust emitted during dry machining was a serious problem for air quality evaluation at the workplace. Furthermore, the best sampling of fine and ultrafine particles produced during material cutting, passed through the dilution of high particle concentration (number, ...

Low Reynolds Number Flow Around a Flying Saucer Micro Air Vehicle

S. Cortés[1], D. Güemes[1], R. Ávila[1]
[1]Universidad Nacional Autónoma de México, Mexico City, Mexico

The study of low Reynolds number flow around air vehicles of the order of centimeters. According to DARPA, a NAV is defined as a vehicle with 7.5 cm of length and weight of 20 grams. We calculated the flow around a small length scale 3D rigid body with complex geometry. Firstly we perform the numerical simulation of the two dimensional flow around a circular cylinder for 30< ReD

COMSOL Multiphysics® 在热发电用真空集热管设计中的应用

赵旭山 [1], 郝雷 [1], 蒋利军 [1], 米菁 [1], 杨海龄 [1],
[1] 北京有色金属研究总院,北京,中国

随着能源紧张、油价攀升,环境污染严重,利用可再生绿色能源又成为不懈努力的方向。槽式太阳能热发电技术具有兼容性强、对电网冲击小、性价比高、发电成本低、可存储可调度等特点,近年来得到了迅猛发展,其核心部件为高温太阳能真空集热管,如图1所示。本研究利用 COMSOL Multiphysics® 针对真空集热管真实工况下的动态过程开展研究,并在此基础上开展集热管结构的优化设计。 由图1可知:集热管在电站中服役工况下,槽面会聚的太阳光主要集中于集热管下半面,上半面接收的会聚太阳光较少;导热工质自吸收管一端进入,接收会聚太阳光辐照能量,从吸收管另一端流出,流入→流出过程中,导热工质被加热;集热管外表面与外部环境通过热辐射和对流两种方式换热;吸收管与玻璃罩管间形成的环形密闭高真空区域各内表面通过热辐射换热,不考虑对流;集热管两端支撑固定于聚光器上,由于本身自重和热应力 ...

Modeling the Acoustic Scattering from Objects Buried in Porous Sediment Using COMSOL Multiphysics® Software

A. Bonomo [1], M. Isakson [1],
[1] Applied Research Laboratories, The University of Texas at Austin, Austin, TX, USA

A frequency-domain finite element (FE) technique for computing the acoustic scattering from axially symmetric fluid-loaded structures subject to a nonsymmetric forcing field based on Ref. 1 is extended to poroelastic media and implemented in COMSOL Multiphysics® software. This method allows for the scattering body to consist of any number of acoustic, elastic, and poroelastic domains. The ...

Numerical Modeling and Verification of Acoustic Streaming Induced by Ultrasonic Treatment

D. Rubinetti [1], D. A. Weiss [1], J. Müller [2], A. Wahlen [2],
[1] Institute of Thermal and Fluid Engineering, University of Applied Sciences Northwestern Switzerland, Windisch, Switzerland
[2] Institute of Product and Production Engineering, University of Applied Sciences Northwestern Switzerland, Windisch, Switzerland

Acoustic streaming (AS) describes a physical phenomenon where an oscillating sound emitter induces a steady fluid motion. Metal processing industry applies this treatment for grain morphology adjustments during the solidification of metal. Improvement and further development of this technique focus on numerical modeling to reduce substantial costs for test rigs and field tests. This study ...