finite elements – TechConnect Briefs

Determination of Elastic and Thermal Properties of Nanocomposites by Fiber Embedment in Finite Elements

Spanos P.D., Esteva M., Akin J.E., Rice University, US

In this paper the impact of entangled and non-straight fibers in the determination of the effective elastic and thermal properties of polymer nanocomposite (PNC) is addressed. Most of the models in recent studies assume nanotubes [...]

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Doody C.B., Wadhwa J.S., Lemmerhirt D.F., White R.D., Tufts University, US

The goal of this project was the experimental characterization and modeling of capacitive micromachined ultrasound transducers (cMUTs). The cMUTs being tested are fabricated using layers common to standard commercial CMOS processes. Two designs of micromachined [...]

Computing Excitons in V-shaped Quantum Wires Including Band-Structure and Dielectric Effects : Binding energies and polarization anisotropy of the bright A1, B1, A2 excitons

Dupertuis M.A., Oberli D.Y., Kapon E., Swiss Federal Institute of Technology-EPFL, CH

We demonstrate an efficient numerical scheme for the computation of the excitonic optical response of actual GaAs/AlGaAs quantum wire structures including a large set of relevant effects; structural, valence band-mixing, dielectric and many-body effects can [...]

Computing Excitons in V-shaped Quantum Wires Including Band-Structure and Dielectric Effects : Binding energies and polarization anisotropy of the bright A1, B1, A2 excitons

Dupertuis M.A., Oberli D.Y., Kapon E., Swiss Federal Institute of Technology-EPFL, CH

We demonstrate an efficient numerical scheme for the computation of the excitonic optical response of actual GaAs/AlGaAs quantum wire structures including a large set of relevant effects; structural, valence band-mixing, dielectric and many-body effects can [...]

Triangle Transducer for Micro Electro Mechanical Systems (MEMS) Simulation in ANSYS Finite Element Program

Gyimesi M., Ostergaard D., Avdeev I., ANSYS, Inc., US

The paper introduces a new methodology with a distributed triangle transducer for the strongly coupled simulation of micro electro mechanical systems (MEMS) in ANSYS Finite Element (FE) program.

Efficient Numerical Methods for the Simulation of Flow Reactors

Becker R., Braack M., Heuveline V., Rannacher R., University of Heidelberg, DE

We describe recent developments in the design of numerical methods for the simulation of heat transport and chemical processes in ow reactors. For viscous ow in the low-Mach-number regime, we use a stable finite element [...]

Using Pseudo Transient Continuation and the Finite Element Method to Solve the Nonlinear Poisson-Boltzmann Equation

Shestakov A.I., Milovich J.L., Noy A., Lawrence Livermore National Laboratory, US

The nonlinear Poisson-Boltzmann (PB) eequation is solved using Pseudo Transient Continuation. The PB solver is constructed by modifying the nonlinear diffusion modeule of a 3D, massively parallel, unstructured grid, finite element, radiation-hydrodynamics code. The solver [...]

The Atomic Limit of Finite Elements in the Simulation of Micro-Resonators

Rudd R.E., University of Oxford, UK

We describe developments in the coupling of length scales methodology which allows the simulation of the dynamic and temperature dependent behavior of sub-micron Micro-Electro-Mechanical Systems (MEMS). This novel technique accurately models the behavior of the [...]

Wavelet Based Matrix Compression in Numerical Micromagnetics

Schrefl T., Süss D., Fidler J., Vienna University of Technology, AT

Magnetic sensors and magneto-mechanic devices consist of spatially distinct ferromagnetic parts. Modeling their functional behavior requires to take into account the magnetostatic interactions between the magnetic elements. A hybrid finite element / boundary element method [...]

3D Modeling of Metallic Grain Growth

George D., Carlson N., Gammel J.T., Kuprat A., Los Alamos National Laboratory, US

This paper will describe simulating metallic grain growth using our Gradient Weighted Moving Finite Elements code, GRAIN3D. We also describe the set of mesh topology change operations developed to respond to changes in the physical [...]