In this case the analytical solution makes the interesting prediction Next, we will vary the shell permittivity and look at the electric field at the center of the shell. z, as noted here) yields good agreement with the analytical calculation, modulo some funkiness at points on or near the boundary surfaces which is to be expected in an SIE/BEM calculation: the 3rd column of the latter (real part of E z vs.
#Geo gmsh cinema 4d code
This run of the code produces files SphericalShell.scattered and SphericalShell.total. Note that we choose a frequency low enough to ensure we are well within the electrostatic limit, and that the constant z-directed electrostatic field described in the memo above becomes a linearly polarized plane wave traveling in the x- direction. In this case we will name our scuff-em geometry file GoldSphere.scuffgeo: Now let's redo the calculation for a sphere made of gold instead of silicon carbide. Here's a comparison of the scuff-scatter results with the analytical Mie series, as computed using this Mathematica script. Note that, during computationally-intensive operations such as the BEM matrix assembly, the code should be using all available CPU cores on your workstation if you find that this is not the case (for example, by monitoring CPU usage using htop) you may need to reconfigure and recompile with different openmp/pthreads configuration options.) You can monitor its progress by following the scuff-scatter.log file. (On my fairly standard workstation (8 Xeon E5420 cores, 2.5 GHz), this calculation takes a few minutes to run. This produces the file SiCSphere.PFT, which contains one line per simulated frequency each line contains data on the scattered and total power, the force, and the torque on the particle at that frequency. In contrast, when specifying functions of angular frequency like Eps(w) in MATERIAL.ENDMATERIAL sections of geometry files or in any other scuff-em material description, the w variable is always interpreted in units of 1 rad/sec, because these are the units in which tabulated material properties and functional forms for model dielectric functions are typically expressed.)įinally, we'll create a little text file called Args that will contain a list of command-line options for scuff-scatter these will include (1) a specification of the geometry, (2) the frequency list, (3) the name of an output file for the power, force, and torque (4) the name of a cache file for geometric data (this file doesn't exist yet, but will be created by our first run of scuff-scatter), and (5) a specification of the incident field. These are natural frequency units to use for problems involving micron-sized objects in particular, for Mie scattering from a sphere of radius 1 μm, as we are considering here, the numerical value of Omega is just the quantity kR (wavenumber times radius) known as the ``size parameter'' in the Mie scattering literature. If your goal is to remesh the model, you could reparametrize the surface/curve mesh though - see tutorial/t13.geo.(We pause to note one subtlety here: Angular frequencies specified using the -Omega or -OmegaFile arguments are interpreted in units of c / 1 μm = 3 geo file (which I don't have access to) from a.
the question is: is it possible to generate a. msh file that I must share as part of some experiments (especially to reproduce them), however, I do not want to share such a large file (200mb). > I hope this question is not too obvious, in which case I apologize.
> On, at 17:46, Octavio Castillo Reyes wrote: Next message (by thread): Help/advice with definition of mesh size.
Previous message (by thread): geo from msh.Geo from msh Christophe Geuzaine cgeuzaine at uliege.be
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