Computational Dynamics Laboratory
Louisiana State University
Fluid and solute transport in hemodiafilter hollow fibers occurs through a non-trivial interaction of convection and diffusion, modulated by a number of factors that include the non-Newtonian behavior of blood, the density and viscosity dependence of blood on the local hematocrit and protein concentration, the Fahraeus-Lindquist effect on hematocrit, the osmotic effects of protein and partially ...
David S. Burnett
Naval Surface Warfare Center
Panama City, USA
The author is integrating a suite of software tools for modeling the scattering of acoustic beams (sonar) from undersea targets (mines) that may be buried or partially buried in the sedimentary ocean bottom in littoral (shallow water) environments. This is a Multiphysics problem involving acoustic waves in the water, acoustic or poro-elastic waves in the sediment, and both elastic and acoustic ...
Finite element modeling of the field enhancement phenomenon in nanoscale field emitters and field ionizers
Ramin Banan Sadeghian and Mojtaba Kahrizi,
Interest in nanoscale field emission and field ionization devices has been renewed in recent years. Several new materials and novel device concepts have been introduced with promising field emission (FE) and field ionization (FI) behavior. Among them vertical ZnO nanowires (ZnONW) exhibit unique FE properties at relatively low applied electric fields. Using FEMLAB, we employed finite element ...
Åberg, J., Vynnycky, M., Fredriksson, H.
KTH/Metallernas Gjutning, Stockholm, Sweden
This paper reports on progress in the implementation of COMSOL Multiphysics 3.2 to model thermal stresses in a three-dimensional solidifying shell, as occurs typically in the industrial continuous casting of copper, copper alloys and steel. Computer memory requirements prohibit a direct 3D numerical simulation of the temperature and the stresses. Instead, we use the fact that casting ...
Confinement Loss Computations in Photonic Crystal Fibres using a Novel Perfectly Matched Layer Design
Viale, P., Février, S., Gérôme, F., Vilard, H.
IRCOM, CNRS UMR 6615, Limoges, France
To modelize infinite photonic crystal fibre (PCF) with 2D-finite-geometry mode solver, it is necessary to use a perfectly matched layer (PML). We have performed a new type of PML design to simulate propagation in PCFs. The results obtained with index-guiding PCFs are in very good agreement with previous theoretical published results. Our PML is quickly optimized. The link between MATLAB and ...
Mahecha-Botero, A., Elnashaie, S.S.E.H., Grace, J.R., Lim, C.J.
Department of Chemical and Biological Engineering, University of British Columbia, East Mall, Vancouver, BC, Canada
COMSOL (formerly FEMLAB) is being utilized to solve partial differential equations simulating fluidized bed reactors as part of the development of a novel generalized fluidized-bed catalytic reactor model. Simulations are carried out to account for complex dynamic transport and hydrodynamic phenomena such as: heat and mass axial and radial anisotropic dispersion, temperature and pressure ...
Deibel, J.A., Wang, K., Escarra, M.D., Mittleman, D.M.
Department of Electrical and Computer Engineering, Rice University, Houston, TX, USA
The terahertz (THz) region of the electromagnetic spectrum (100 GHz to 10 THz) remained relatively unexplored until developments in ultrafast laser technology provided techniques for the generation and detection of THz radiation. Recently, simple metal wires were found to be effective terahertz waveguides that exhibited very low loss and dispersion. The THz radiation propagates along the surface ...
Gamborg Andersen, G., Petrunin, V.V., Baurichter, A.
University of Southern Denmark, Physics Department, Odense, Denmark
We used FEMLAB (Finite Element Modelling LABoratory) for modelling heat propagation in 4 dimensions (time and the 3 spatial dimensions) after pulsed laser heating of non-isotropic materials during surface science experiments. As an example, the spatial and temporal evolution of a laser induced temperature jump in highly oriented pyrolytically grown graphite (HOPG) was calculated on a ns time ...
Strauss, D.J., Trenado, C.
Institute of New Materials, Saarbrücken
Mathematical modeling at the Institute of New Materials has played a crucial role in supporting the manufacturing and design of new technologies of nanomaterials, whose applications range from transportation, electronics and optics engineering to environmental sciences. In this paper, we focus our attention to two mathematical models together with their corresponding FEMLAB simulations: The ...
Zampolli, M., Tesei, A., Jensen, F.B.
NATO Undersea Research Centre, 19138 La Spezia, Italy
Acoustic waves are used in SONAR systems for the detection and classification of objects which may be swimming in the water column, proud on the seafloor, or buried below the sediment. In some applications, such as low frequency detection and classification of structurally complex objects immersed in a fluid, signal processing techniques must be aided by a-priori model based knowledge of the ...