RF MEMS Research Group
Eindhoven, The Netherlands
In this paper it is shown how the equivalent circuit parameters of a MEMS resonator can be simply obtained from an eigenfrequency simulation. Additionally, it is demonstrated that the Q-factor as a result of support losses in a MEMS resonator can be determined using a matched boundary layer. The method is applied to calculate the frequency dependent admittance of a diamond disk resonator. Results ...
An Optimized Convolutional-Perfectly Matched Layer (C-PML) Absorbing Boundary Condition for Second-order Elastic Wave Equations
O. Bou Matar1,2, E. Galopin1, Y. Li1,2, and O. Ducloux1,2
1Institut d'Electronique, de Micro-électroniqueet de Nanotechnologie, Villeneuve d'Acsq, France
2Laboratoire Européen Associé en MagnétoAcoustiqueNonlinéaire de la matière condensée (LEMAC), Ecole Centrale de Lille, Villeneuve d'Ascq, France
In this study, we extend the Convolution-Perfectly Matched Layer (C-PML) method we have developed for a first order system describing elastic waves in velocity and stress formulation to the same equation written as a second order system displacement.We illustrate the efficiency of this second order Perfectly Matched Layer upon 2D benchmarks with surface waves and Lamb Waves.
A. Bradji1, and E. Holzbecher2
1Charles University, Prague, Czech Republic
2Weierstrass Institute for Applied Analysis and Stochastics WIAS, Berlin, Germany
The convergence of numerical solutions is mainly determined by the convergence order, which quantifies the improvement of the solution when the mesh is refined. In this paper we examine various differential equations and the convergence behavior of their COMSOL Finite Element solutions. The numerically observed convergence rates are compared with theoretical results, as far as these are ...
Numerical Simulation of the Electrical Double Layer Based on the Poisson-Boltzmann Models for AC Electroosmosis Flows
P. Pham1, M. Howorth1, A. Planat-Chrétien1, and S. Tardu2
1Département des microTechnologies pour la Biologie et la Santé, CEA/LETI, Grenoble, France
2LEGI, Grenoble, France
In this paper, the analytical validation of Poisson-Boltzmann (PB) equation computed with COMSOL Multiphysics in the case of a polarized surface in contact with an electrolyte, is first presented.COMSOL Multiphysics algorithms easily handle the highly nonlinear aspect of the PB equation. The limitations of the PB model, that considers ions as point like charges, are outlined. To account for the ...
J. Frassy1, C. Lecot2, M. Murariu3, C. Delattre1, and A. Soucemarianadin1
1Université Joseph Fourier, Grenoble, France
2Université de Savoie, Le Bourget-du-Lac, France
3LETI, CEA, Grenoble, France
We present simulations of drops spreading on random surfaces with either chemical or topographical heterogeneities. All the computations are made within the framework of the lubrication approximation. The droplet height is the solution of a time-dependent nonlinear fourth order partial differential equation, which is solved using COMSOL. Fast Fourier Transform (FFT) together with an appropriate ...
J-.M. Dedulle1,2, F. Mercier1, D. Chaussende1, and M. Pons3
1Laboratoire des Matériaux et du Génie Physique, Grenoble, France
2IRIS Technologies, Grenoble, France
3Science et Ingénierie des Matériaux et Procédés, Saint-Martin d'Hères, France
The main problem for the development of 3C-SiC electronics is the lack of an adapted bulk growth process.Indeed, sublimation, which is the classical process for the growth of 4H-SiC and 6H-SiC ingots, is not adapted for the 3C polytype because of the solid state transition from cubic to hexagonal crystals, which occurs at high temperature. We therefore choose growth from liquid phase rather than ...
On the Use of COMSOL Multiphysics to Understand and Optimize the Filling Phase in the Injection and Micro-Injection Molding Process
M. Moguedet1, P. Namy2, and Y. Béreaux3
1Pôle Européen de Plasturgie, Bellignat, France
2SIMTEC, Grenoble, France
3LAMCOS, Site de Plasturgie, INSA Lyon, Bellignat, France
The work presented here deals with the simulation of the cavity filling stage of the injection and micro-injection molding process for thermoplastic materials.COMSOL Multiphysics gives us the means to take into consideration some other aspects usually neglected in commercial 3D softwares dedicated to polymer processing. In particular, tracking of the flow front is based on a Level Set approach. ...
A. Soveja1,2, J. M. Jouvard1, and D. Grevey1
1Institut Carnot de Bourgogne, Bourgogne, France
2Faculté de Génie Mécanique, Université "Politehnica" Timisoara, Timisoara, Romania
During laser-matter interaction, a very small layer of molten material forms. The vapor plumes, formed by material vaporization, exercise an overpressure on the molten material. In a previous work, a 1D thermal model was carried out, but this model did not account for all physical phenomena during laser-matter interaction. For that, it is necessary to couple the thermal equations, the fluids ...
B. Benamar1, E. Favre2, A. Donnot1, and M. O. Rigo1
1 Laboratoire LERMAB, Faculté des Sciences et Techniques de Nancy, UMR, Vandoeuvre-lès-Nancy, France
2 COMSOL France, Grenoble, France
This paper presents the finite element solution for ionized fields in the coaxial cylinders configuration during the positive corona discharge using COMSOL Multiphysics. The coupled differential equations describing a monopolar DC corona are completely solved by using three application modes:PDE (General Form) mode for electric potential distribution, PDE (General Form) mode for space charge ...
CETP/IPSL, Saint Maur des Fossés, France
The study of extremely low frequency electromagnetic wave propagation in the ionospheric cavities of celestial bodies in the Solar System follows an approach similar to that developed for the Earth. It contributes to the characterization of the atmospheric electric circuit and associated energy sources, and to the identification of the inner and outer cavity boundaries. A wave propagation, 3D ...