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.

Generation of Lofted NURBS Curves for 3D Model Generation with COMSOL Multiphysics®

R.T. Hart[1]
[1]Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA

A key challenge to finding quantitative solutions to biological problems is to model the complex 3D geometry of naturally occurring structures. Model generation often starts from serial sections from CT or MRI scans, confocal microscopy, or physical sectioning. In addition, prior to V4 of COMSOL Multiphysics®, there was a "loft" command to allow construction of 3D models from serial sections ...

Numerical Simulation for Landfill Stabilization Process considering Degradation of Organic Chemical Compounds in Waste

Hiroyuki ISHIMORI[1]
[1]Ritsumeikan University, Kyoto, Kyoto, Japan

This presentation describes the numerical simulation model where gas/liquid two-phase porous media flow equations are coupled to multicomponent gas-phase transport and water-phase transport equations in COMSOL Multiphysics. This is done in order to predict the landfill stabilization process considering degradation of organic chemical compounds in waste.

Multiscale Model of Human Pathogen Growth on Fresh Produce - new

A. Warning[1], A. K. Datta[1]
[1]Department of Biological & Environmental Engineering, Cornell University, Ithaca, NY, USA

Predictive food microbiology currently first requires experimental data for growth on fresh produce and then fitting an empirical or semi-empirical model to the data, making extrapolation to other conditions (temperature, type of produce) difficult. Herein, we develop a mechanistic model for the growth of human pathogenic bacteria (Escherichia coli O157:H7 and Salmonella spp.) on spinach using ...

Simulating Organogenesis in COMSOL: Towards Efficient 3D Simulations of Organogenesis

D. Barac [1], Z. Karimadini [1], R. Croce [1], D. Iber [1]
[1] Department of Biosystems Science and Engineering (D-BSSE), ETH Zurich, Basel, Switzerland

One of the major challenges in biology concerns the integration of data across length and time scales into a consistent framework: how do macroscopic properties and functionalities arise from the molecular regulatory networks ­ and how do they evolve? A deeper understanding of morphogenesis and organogenesis in particular is required to advance tissue engineering. Recent advancements in 3D ...

Research and Development of Multiphysics Models in Support of the Conversion of the High Flux Isotope Reactor to Low Enriched Uranium Fuel

The findings presented in this report are results of a five-year effort led by the Research Reactors Division (RRD) of the Oak Ridge National Laboratory (ORNL), which is focused on research and development toward the conversion of the High Flux Isotope Reactor (HFIR) fuel from high-enriched uranium (HEU) to low-enriched uranium (LEU). This report focuses on the tasks accomplished by the ...

基于 ALE 方法的脉冲磁体不可逆电感变化计算

蒋帆 [1], 孙衢骎 [1],
[1] 武汉脉冲强磁场中心,武汉,湖北,中国

目前,脉冲磁体广泛采用导体绕组和加固材料分层交替绕制的工艺(内部层间加固),以提高磁体的整体结构强度。磁体在长期的放电工作过程中,反复经历强电磁力的作用,导体材料(一般为纯铜、铜基合金以及铜基复合材料)在重复的加卸载过程中存在着塑性应变的累积效应,即棘轮效应。导体材料塑性应变的逐渐累积,导致了磁体不可逆电感值的不断增加。因此,磁体的不可逆电感变化可表征磁体内部的整体变形情况,可用于脉冲磁体的疲劳失效预测。 本文基于 COMSOL Multiphysics® 5.1 软件,对脉冲磁体的放电过程建立了电路、电磁场、温度场及结构场的二维轴对称全耦合模型。考虑了放电过程中集肤效应对磁体电阻、电感的影响;在结构场中引入了接触对,采用罚函数法对磁体内部的层间分离机制进行了有效的模拟;利用耦合变量,基于 ALE 方法计算了脉冲磁体在服役过程中 ...

梯度多孔玻璃丝吸声性能的数值研究

张秀海 [1], 王琼 [1], 屈治国 [1],
[1] 西安交通大学,西安,陕西,中国

引言 多孔材料能够吸收大量声能且只反射少量声波,因此具有良好的吸声性能而被广泛地用于噪声的控制。梯度多孔材料吸声性能的实验研究已经有所开展,但相应的数值研究却很鲜见。 COMSOL Multiphysics® 的使用 本文分别用3层和6层孔隙度呈等差数列的多孔玻璃丝组合成梯度多孔玻璃丝(图1为由3层不同孔隙度的多孔玻璃丝组成的梯度多孔玻璃丝,空气区域为宽W、高H的矩形,余下区域为多孔玻璃丝区域),并根据 DBM 模型采用 COMSOL Multiphysics® 模拟组合成的梯度多孔玻璃丝的吸声性能。 结果 由图2,梯度多孔玻璃丝(3层)与相同厚度、相同孔隙度普通多孔玻璃丝比较,前者在声音处于低频段情况吸声效果有明显的改善。梯度多孔玻璃丝(3层)和梯度多孔玻璃丝(6层)的吸声系数如图3所示,在 100Hz-400Hz 的低频段,两者吸声系数有较大的误差。 结论 ...

Cellular Convection in Vertical Annuli at roof slab of Fast Breeder Reactor

M. G. Hemanath[1], C. Meikandamurthy[1], G. Padmakumar[1], C. A. Babu[1], P. Kalyanasundaram[1], and G. Vaidyanathan[1]
[1] Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India

In the pool type Fast Breeder Reactors the roof structure is penetrated by a number of pumps and heat exchangers which are cylindrical in shape. Argon gas in reactor is sandwiched between the free surface of sodium and the roof structure and can flow in the annular space between the components and roof structure forming a thermosyphon. These hermosyphons not only transport heat from sodium to ...

FEM Study on Contactless Excitation of Acoustic Waves in SAWDevices

A. K. Namdeo[1], N. Ramakrishna[2], H. B. Nemade[1,2], and R. P. Palathinkal[1]

[1] Department of Electronics and Communication Engineering, Indian Institute of Technology Guwahati, Assam, India
[2] Centre for Nanotechnology. Indian Institute of Technology Guwahati, Assam, India

In this paper a finite element method(FEM) study of a surface acoustic wave (SAW)device excited by electrostatic coupling method is performed by using COMSOL Multiphysics. We have modeled a Rayleigh wave type SAW device by choosing YZ Lithium niobate as the substrate. The effect of external radio frequency (RF) field to the SAW device is analyzed. The effect of distance between the contactless ...

Assessment of COMSOL Capabilities to Analyse the Thermo- Hydrodynamic Behaviour of the MSR Core

A. Cammi[1], V. Di Marcello[1], C. Fiorina[1], and L. Luzzi[1]

[1]Nuclear Engineering Division, Department of Energy, Politecnico di Milano, Milano, Italy

The present work is aimed at evaluating the capabilities of COMSOL Multiphysics® to treat heat transfer in Molten Salt Reactors (MSR). The analyzed situation is represented by the molten salt in turbulent regime flowing through a cylindrical channel surrounded by graphite, with both the fluid and the solid generating power. A suitable validation framework has been set up on the basis of an ...

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