Technical Papers and Presentations

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.

Analysis of Multiconductor Quasi-TEM Transmission Lines and Multimode Waveguides

S.M. Musa[1], M.N.O. Sadiku[1], and O.D. Momoh[2]
[1]Prairie View A&M University, Prairie View, TX, USA
[2]Indiana University-Purdue University, Fort Wayne, IN, USA

This paper presents an analysis approach of multicondcutor quasi-TEM lines transmission interconnect in a single dielectric region and multimode waveguides using the finite element method (FEM). FEM is especially suitable and effective for the computation of electromagnetic fields in strongly inhomogeneous media. We illustrate that FEM is suitable and effective as other methods for modeling of ...

Designing a Current Injection Tool for Logging While Drilling

B. Oetiker[1], B. Friedman[1], and H.E. Hall Jr.[1]

[1]Department of Physics, Sam Houston State University, Huntsville, Texas, USA

High-resolution imaging is useful in oil and gas exploration to identify producing fractures that can be in the millimeter thickness range. In principle, high-resolution imaging maybe achieved using “current injection” to measure the electrical conductivity of the formation. Two current injection devices are compared for possible use as Logging While Drilling (LWD)imaging: The ...

Computational study of Solidification and Melting of Alloys

Shuang-Shii Lian
National Taiwan University

This paper is written in Chinese. --------------------------------- Keynote speaker's biography: Since 1991, Prof. Shuang-Shii Lian has been with the Department of Materials Science and Engineering, National Taiwan University. He earned a PhD degree in Metallurgy at Technische Universität Berlin, Institut für Metallurgie, Germany in 1981. He is using COMSOL Multiphysics since 2002 ...

Quasi-static Analysis on the Effect of Metal Penetrating Depth into the Substrate in Microstriplines

S. Musa, and M. Sadiku
Prairie View A&M University Networking Academy (PVNA), Prairie View, TX, USA

The effect of metallization thickness on planar transmission lines plays an essential role in microwave integrated circuits and thin film technology, especially in the propagation characterization and the electric field distribution in the structures. The objective of this paper is to consider the planar transmission lines with finite thickness not penetrating and penetrating into isotropic ...

Field-Circuit Coupling Applied to Inductive Fault Current Limiters

D. Lahaye[1], D. Cvoric[2], S. de Haan[2], and J. Ferreira[2]
[1]Delft Institute of Applied Mathematics, Department of Electrical Engineering, Mathematics and Computer Sciences, TU Delft, The Netherlands
[2]Electrical Power Processing Unit Department of Electrical Engineering, Mathematics and Computer Sciences, TU Delft, The Netherlands

Fault Current Limiters (FCLs) are expected to play an important role in the protection of future power systems due to the rising levels of the short-circuit currents. The inductive FCLs, comprising magnetic cores and one or more dc and ac windings, are particularly interesting because they inherently react on the fault. The so-called open-core FCL configuration employs only one magnetic core for ...

Effective Medium Theory of Nanodielectrics for Embedded Energy Storage Capacitors

R. Bikky, N. Badi, and A. Bensaoula
University of Houston, Houston, TX, USA

In this work, we present the effective properties of nanodielectrics with gold (Au) nanoparticles embedded in polymer (Polyvinyl Pyrrolidone (PVP)) matrix, calculated by using finite element method (FEM) based simulation in COMSOL Multiphysics software. Drude model is used to calculate size dependent complex dielectric function of Au. EMTs of Maxwell-Garnett, Bruggeman and Looyenga models are ...

Impedance measurements in reinforced concrete and 3D FEM simulations

Nogueira, A.1, Nóvoa, X.R.1, Keddam, M.2, Vivier, V.2
1 Universidade de Vigo (E.T.S.E.I.) Spain
2 UPR 15 CNRS “LISE”, case 133 - Université P. & M. Curie, Paris, France

The electrochemical impedance spectroscopy (EIS) measurements in reinforced concrete are reported and compared with 3D-finite element simulations with FEMLAB software. It was shown that the current injected in the cement past was partially collected by the reinforcement. Moreover, from both experimental results and calculations, it was shown that the fraction of current collected depends on the ...

Finite Element Analysis of Multilayer Transmission Lines for High-Speed Digital Interconnects

S.M. Musa, and M.N.O. Sadiku
Prairie View A&M University, Prairie View, TX, USA

In this paper, we consider the finite element modeling of multilayer transmission lines for high-speed digital interconnects. Using COMSOL we mainly focused on the modeling of the transmission structures with both cases of symmetric and asymmetric geometries. We specifically designed asymmetric coupled microstrips and four-line symmetric coupled microstrips with a two-layer substrate. We ...

Permanent Magnet Arrangements for Low-Field NMR

C. Horch[1], S. Schlayer[1], and F. Stallmach[1]
[1]Faculty of Physics and Earth Sciences, University of Leipzig, Leipzig, Germany

For low-field NMR (Nuclear magnetic resonance), NdFeB permanent magnet arrangements are proposed to provide the static polarizing magnetic field. Especially a parallel and a circular arrangement of the permanent magnets, iron yokes and small shim magnets were tested and improved by COMSOL. The intent was to guide the design and the construction of NMR magnets by calculating the magnetic field ...

Quasi-static Analysis of Shielded Microstrip Lines

S.M. Musa, and M.N.O. Sadiku
Prairie View A&M University, Texas

Microstrip lines are the most commonly used transmission lines at high frequencies. In this paper, we will illustrate how to model the capacitance of microstrip lines using COMSOL Multiphysics. The goal is to determine the capacitance per unit length of shielded microstrip lines.

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