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.

Modeling of a Multilayered Propellant Extrusion in Concentric Cylinders - new

S. Durand[1,3], C. Dubois[1], P. Lafleur[1], V. Panchal[2], D. Park[2], D. Lepage[3], P. Paradis[3]
[1]École Polytechnique de Montréal, Montréal, QC, Canada
[2]US Army ARDEC, Picatinny Arsenal, NJ, USA
[3]General Dynamics OTS Canada Valleyfield, Valleyfield, QC, Canada

A novel propellant technology requires extruding two formulations with differential burning rates together as a multilayered propellant. This propellant is processed into a concentric cylinder configuration, in the form of slow-fast-slow with single perforation. The material uses different path lengths between the inner and outer sections of the die, both coming from the same pressure driven ...

Análise de Influência da Utilização de Propriedades Termodependentes na Simulação de Juntas Soldadas

A. A. S. B. Cruz [1], N. S. B. da Silva [1],
[1] Universidade Federal de Pernambuco, Recife, PB, Brasil

Visando minimizar os cálculos envolvidos em simulações numéricas de juntas soldadas e diminuir a quantidade de informações necessárias, busca-se fazer simplificações que não tenham influências consideráveis nos resultados. Para o presente trabalho, analisou-se, através do COMSOL Multiphysics, o impacto das propriedades dos materiais dependentes da temperatura neste tipo de simulação. Para ...

Janus 颗粒自驱运动的数值模拟

崔海航 [1], 王雷磊 [1], 谭晓君 [1],
[1] 西安建筑科技大学,西安,陕西,中国

Janus 颗粒是由物理或化学性质不同的两部分所构成的颗粒的总称。由于其结构的特殊性以及自驱动特性使其在MEMS、药物传输等领域有着潜在的应用价值。本文基于COMSOL Mutiphysics® 4.3a 多物理场耦合模拟平台对不同形状的 Pt-SiO2 型 Janus 颗粒的在不同浓度 H2O2 溶液中的自扩散泳动进行了数值模拟,并进一步研究模拟了球形 Janus 颗粒的近壁面运动。

介质深层充电的电场与热场耦合计算

王 松 [1], [2], 唐小金 [2]
[1] 军械工程学院静电与电磁防护研究所, 石家庄,河北,中国
[2] 北京卫星环境工程研究所, 北京,中国

摘要:在太空高能带电粒子作用下,航天器上存在绝缘介质深层充电的危险。介质内沉积电荷导致局部出现强电场(达到107V/m),有可能造成介质击穿放电。一方面,充电过程与介质电导率密切相关,而电导率受温度影响显著,另一方面,介质中的通电导体发热会影响介质的局部温度,于是有必要综合考虑介质中电场与热场的耦合变化过程。对此,我们建立了考虑电场与热场耦合变化的介质深层充电模型,并采用 COMSOL Multiphysics® 软件,实现了数值求解。结果表明,在一定的空间辐射环境下,考虑热场是十分重要的,热导率会对充电结果产生不可忽视的影响。该模型有利于多因素作用下的航天器介质深层充电评估计算。 1. 引言: 近些年,卫星充放电效应得到了广泛关注和研究[1, 2]。太空高能电子会射入航天器绝缘介质中,因为该介质极低电导率(10-15S/m量级),使得内部沉积电荷难以泄放 ...

Numerical Analysis Of Entry Length In Cleaning Test Rig

N. Nordin [1]
[1] Universiti Putra Malaysia, Malaysia

Fouling and cleaning processes present a major impact to the manufacturing industry in terms of economics, product quality, product safety, and plant efficiency. An efficient cleaning process is essential is order to remove fouling to maintain quality and safety of production process as well as the product. Thus, cleaning should be done with minimum cost and time, and understanding soil ...

Numerical Simulation of Electrokinetic Convection-Enhanced Delivery of Macromolecules

Y. Ou [1], A. Jaquins-Gerstl [1], S. G. Weber [1],
[1] Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA

The brain is a heterogeneous porous medium with regions of anisotropy. Measurements of tortuosity (λ) showed that diffusion in gray matter (e.g. striatum) is isotropic (λ = 1.65), whereas it is anisotropic in white matter (e.g. corpus callosum) (λparallel = 1.38, λperpendicular = 1.80)[1-2]. Pressure-driven convection-enhanced delivery (CED) of macromolecules (e.g. drugs) was first described in ...

Modeling Ex Vivo Microwave Hyperthermia of Different Biological Tissues

H. Kokabi [1], G. Chen [1], N.-E. Belhadj-Tahar [1],
[1] Université Pierre et Marie Curie, Paris, France

Electromagnetic and thermal simulations are achieved using COMSOL Multiphysics® with 2D axisymmetrical finite–element method for a percutaneous microwave hyperthermia system with ex–vivo experiments on different biological tissues. Temperature variation and distribution are studied in the biological tissues submitted to an open ended coaxial cable as microwave applicator. Three types of heat ...

Thermal Corrective Devices for Advanced Gravitational Wave Interferometers

M. Kasprzack [1], J. Ramette [2],
[1] Louisiana State University, Baton Rouge, LA, USA
[2] Hillsdale College, Hillsdale, MI, USA

The advanced gravitational wave detectors require injecting a high continuous power laser into the optical cavities of the interferometers to reach their design sensitivity. To mitigate the thermal aberrations created by absorption of this high power load into the various optical elements, thermally actuated devices are installed at strategic places in the instruments, like ring heaters ...

Establishing Tolerances and Limits of Failure for Sample and Reagent Flow Using COMSOL Multiphysics® Software

S. Kumar [1], D. Dendukuri [1]
[1]Achira Labs, Bangalore, Karnataka.

Microfluidics is the science of manipulating and controlling fluids at the micron scale. Although, fluid flow in standard geometries can be determined easily by analytical methods, a more rigorous computational model is required for custom geometries. Achira’s microfluidics cartridge has a microchannel with intricate curvatures to allow the entrapment of biosensors. The number and dimensions of ...

Simulating the Effect of Groundwater Flow and Heterogeneity on Borehole Thermal Energy Storage

M. Possemiers [1], L. De Henau [1], J. Van Steenwinkel [1],
[1] AGT - Advanced Groundwater Techniques, Aartselaar, Belgium

In Borehole Thermal Energy Storage (BTES), also called closed loop ground source heat pumps (GSHP) or closed systems, the thermal energy is stored and recovered with a closed hydraulic circuit consisting of one or more boreholes with vertical heat exchangers. The heat exchangers consist of plastic tubes wherein a fluid (commonly a water-glycol mixture) is circulated and absorbs the thermal ...