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COMSOL API Based Toolbox for the Mixed-Level Modeling of Squeeze-Film Damping in MEMS: Simulation and Experimental Validation

M. Niessner[1], G. Schrag[1], J. Iannacci[2], and G. Wachutka[1]
[1]Institute for Physics of Electrotechnology, Munich University of Technology, Munich, Germany
[2]MEMS Research Unit, Fondazione Bruno Kessler, Povo di Trento, Italy

We present an easy-to-use toolbox for the automated generation of reduced-order mixed-level models for the evaluation of squeeze-film damping in microelectromechanical systems. The toolbox is programmed in JAVA and heavily exploits the functionality provided by the COMSOL API. The results obtained from mixed-level model simulation performed in COMSOL Multiphysics agree very well with ...

关于气泡在LIMCA系统中变形的数值模拟 - new

杨文志[1], 王晓东[1]

LIMCA技术是一种原位测量高温液态金属中杂质颗粒的方法。测量的原理为:在一个小孔内外设置一对电极,并且通以电流,这样可以在孔口附近形成一个电敏感区,当杂质经过电敏感区时,通过测量电压脉冲信号以检测杂质的信息。对硬质颗粒的LIMCA技术已经有了许多研究,但实际情况下有些颗粒如气泡是可变形的,这将损害LIMCA的精度。 模型使用了 COMSOL Multiphysics® 中的“层流两相流-相场”和“电磁场”模式,气泡和液态铝以相同的初始速度向相同方向运动,同时在液态导电金属中通以电流。由于流体和气泡是运动的,流动会受到洛伦兹力的影响,所以在流场中加入由电磁场计算得到的“mef.FLtzr”和“mef.FLtzz”作为体积力源项。同时流动结构的改变也会影响电磁场,两个物理场之间存在着强耦合,需要同时求解。 数值计算结果给出了在气泡变形情况下的流场、电磁场 ...

Effect of Permeability Diminution in Nutrient Diffusion in Intervertebral Disc

M. A. Chetoui [1], O. Boiron [2], A. Dogui [3], V. Deplano [2],
[1] Université de Monastir, Ecole Nationale D'ingénieurs de Monastir; Ecole centrale Marseille, Marseille, France
[2] Aix-Marseille Université, CNRS, Ecole Centrale, Marseille, France
[3] Université de Monastir, Ecole Nationale D'ingénieurs de Monastir, Marseille, France

Intervertebral discs (IVD) are fibro-cartilages situated between vertebrae providing their joint flexibility. They play a major role in the transmission and absorption of load through the spine. The disc can undergo progressive structural and quantitative changes in its composition and morphology related to mechanical load applied to the spine which can lead to disc degeneration; this disease is ...

1D Axisymmetric Modeling of Shrinkage for Non-Porous Materials

J. M. Meot [1], A. Briffaz [1], J. Jacquin [2], S. Rashidi [2]
[1] Cirad, UMR QualiSud, Montpellier, France
[2] Bureau national Interprofessionnel du Pruneau, Villeneuve, France

A 1D-axisymmetric model was built to represent the drying of a single d’Ente plum to d’Agen prune. Underlying assumptions of the model were those of Di Matteo et al. 2003. Sorption isotherms of plum come from Tsami et al, 1990 and equation structure of apparent water diffusion coefficients from Sabarez, 2001. External transfer coefficients were adjusted by direct measurements. The parameters of ...

Infrasound Assessment of the Roller Compacted Concrete Dam: Case Study of the Portugues Dam in Ponce, PR

H. Diaz-Alvarez [1], V. P. Chiarito [1], S. McComas [1], M. H. McKenna [1],
[1] U.S. Army Engineer Research and Development Center, Vicksburg, MS, USA

The U.S. Army Corps of Engineers is currently investigating the use of infrasound sensors to monitor the health of structures of interest. Infrasound is low-frequency (2-20 Hz) acoustic energy and is capable of propagating many kilometers from the source structure. Large infrastructure, such as dams, bridges, and buildings emit such signals at their natural or driven frequencies of vibration, ...

Generation of Enhanced LSPR Field in Periodically Varying Height Metal Nano-pillars

N. Chamuah [1], P. Nath [1],
[1] Tezpur University, Sonitpur, Assam, India

Present work demonstrates a detail simulation results on enhanced generation of localized surface plasmon resonance (LSPR) field condition in a periodically varying height metal nano-pillars. Periodically varying height metal nanopillar provides enhanced LSPR field conditions than uniformly structured metal nanopillar. However the refractive index sensing for periodically varying height metal ...

Analysis of a Plasma-Mediated Photoacoustic Response From Plasmonic Nanoparticles in Ultrashort Regime

A. Hatef [1], B. Darvish [1], A. Dagallier [2], C. Boutopoulos [2], M. Meunier [2],
[1] Nipissing University, North Bay, ON, Canada
[2] École Polytechnique de Montréal, Montréal, QC, Canada

Over the last decade, plasmonic nanoparticles (PNPs) have received growing interest as exogenous contrast agents in the thermal expansion based photoacoustic (PA) imaging technique in biomedical applications [1]. Such functionality is due to the localized surface plasmon resonance (LSPR) created by the light-induced coherent oscillation of the conduction electrons in the PNPs. In the near-field ...

络合铁法脱硫工艺在 FLNG 脱硫反应器中的数值模拟

张博文 [1], 曹光 [1], 唐晓 [1]
[1] 中国石油大学(华东),青岛,中国

硫化氢是天然气中的有害成分,它的存在一方面降低了天然气中烃类气体的百分比例,使然气的工业价值降低,同时它极强的毒性和腐蚀性,威胁着钻探开发的每一个环节,常导致重大的安全事故。由于我国海上油气田资源丰富,急需一套完整的工艺及装备系统处理深、远海储藏天然气中的硫化氢,由于恶劣的海洋环境影响,需要优选出适应 FLNG 条件下的脱硫工艺、设计并优化 FLNG 脱硫反应器内部结构。经过研究,我们将络合铁脱硫工艺应用在自主研发的 FLNG 脱硫装置中。利用 COMSOL Multiphysics® 多物理场仿真软件的化学反应工程模块和反应流接口对自主研发的脱硫装置中的络合铁脱硫工艺过程进行仿真,通过建立图1中二维的脱硫装置图形,模拟了脱硫工艺中主要反应物及反应产物浓度随时间分布情况,图2、图3、图4分别为二价铁离子浓度、三价铁离子浓度及硫磺随时间变化在反应装置中分布情况,同时也对流体流动进行仿真 ...

Shape Optimization of Electric and Magnetic System using Level Set Technique and Sensitivity Analysis

Y. Sun Kim, A. Weddemann, J. Jadidian, S. Khushrushahi, and M. Zahn
Dept. of Electrical Engineering and Computer Science
Cambridge, MA

The classical optimization method has been applied to many design problems for electromagnetic systems. One of its major difficulties is related to meshing problems arising from shape modifications. In order to circumvent these kinds of technical difficulties with moving mesh problems, several researches have tried to formulate shape optimization with fixed mesh analyses based on fixed grid ...

The Soil as Bioreactor: Reaction-diffusion Processes and Biofilms

M. Richter[1], S. Moenickes[2], O. Richter[2], T. Schröder[1]
[1]BASF SE, Agricultural Center, Limburgerhof, Germany
[2]Institute of Geoecology, TU Braunschweig, Braunschweig, Germany

In a soil pore, water flows through the biofilm, where the density of the latter was assumed to represent a flow resistance. This mechanism was implemented as a local change of fluid viscosity proportional to local biofilm density. It was assumed that diffusive substrate transport is possible through the biofilm region such that the biofilm was able to degrade the substance. Maximum flow ...