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About pmcardle

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  1. pmcardle

    FEM meshing

    I am running large FEM simulations on an HPC enviroment. It is taking a very long time ~1 day to setup up the meshing of the simulation. I am wondering if there is any way to make this step of the process faster.
  2. Is it possible to used the MoM and send in multiple frequencies simultaneously? As in if I have an incident plane wave, in one simulation can two different frequencies be solved simultaneously?
  3. If I am using the FEM decoupled from the MoM ( Air box surrounding FEM region), is the incident field included in any near-field requests inside the Air box?
  4. I am trying to simulate the propagation of electromagnetic surface waves at the interface of free space, and a material. These surface waves are excited by a plane wave incident on a sharp metallic object near the material/air interface. To inspect the surface waves, I am requesting the electric near-field in and out of the plane of sample, and I expect to see something resembling a spherical wave in the electric field distribution. To simulate the sample. I initially tried using the Half-Planar Green's function method, but I was not able to see any surface waves. The field distributions exponential decayed away from the metallic object with no oscillatory behavior. I then switched to the FEM with the same material and got fields that resemble a surface wave. Any thoughts on why the Green's function method is not producing the same results as the FEM? My initial thought was the discretization of the material in the FEM vs Half-Planar greens function. But this is a hypothesis that I cannot prove which is why I am consulting this forum.
  5. I am getting the following meshing error for the attached model. Warning 18167: Stitch1 - "Stitch1.Face383" could not be meshed. A correct definition could not be recovered. Mesh "Stitch1" with 2849 triangles (2849 flat, 0 curvilinear) What is this indicating? How can I fix it ? Model.cfx
  6. If am using a pure FEM solution such that my entire simulation is surrounded by an air box with absorbing boundary conditions. If the solution is not iteratively converging is it a product of the air box being too small relative to the incident wavelength, the mesh not being refined enough, the medium properties or a combination of all three?
  7. Is there any way to use a perfectly matched layer for an FEM simulation in FEKO? I have a transparent medium, and I must make concessions on the size this medium. I would like to construct a layer that could be placed adjacent to one of this transparent mediums boundaries, that would essentiallly have zero reflection and would absorb all of the transmitted fields. I am trying to remove the presence of back reflections in this transparent medium which are not present in the real situation.
  8. In my simulation I am considering the scattered far-field from my antenna over a box. If I am using the absorbing boundary condition, is the scattered field being absorbed by the air box? Or am I not conceptualizing this correctly.
  9. Thank you for the response. As a follow up, what is the boundary condition for the FEM? and how does it differ from the MoM boundary condition? Cheers, Patrick
  10. I want to simulate the electromagnetic back scattering response from half of a biconical antenna over an anisotropic half plane. Since FEKO does not support the use of a half plane with an anisotropic dielectric function I am instead trying to use a large box with the FEM. I have surrounded my system with an air buffer, but am receiving the following warning: ERROR 33132: Not enough memory available for an in-core solution. Out-of-core storage of the MoM matrix is not supported with the FEM See also message in the output file Model.out So are my options essentially to simulate with more memory such that the FEM-MoM matrix can be stored locally, or reduce the size of my simulation? Is it possible to simulate purely with the FEM with absorbing boundary conditions? If so how would one set this up? I have attached Model.cfxmy model below
  11. Is their a half planar Green's function implemented that supports a material with a 3d anisotropic dielectric function in FEKO? If it does not exist, is it because it has not been implemented or that it has not been formulated for a half plane?
  12. Is it possible to implement a electromagnetic source which has an incoherent phase front? I have been using a plane wave, but would like the phase for the source to be undefined.
  13. Is there a closed form expression for the spherical hankel functions used in the definition of spherical mode data? I have not been able to find any resources that use the smn indexing scheme.
  14. pmcardle

    Thin Metal

    Thank you for the replies
  15. pmcardle

    Thin Metal

    I have attached an image of the simulation. A plane wave is incident and focused by the mirror onto a conical conducting antenna, which is above a metallic layer. It is relevant to have a light source which converges to a focus, which necessitates the mirror. The antenna is above a thin layer of gold ~100 nm. I am simulating the gold by using the multilayered Green's function. I am calculating the scattered electric field from the antenna, in the far field. I have also performed the same simulation with a half planar PEC. For both I am getting inconsistent results for both the half planar PEC and multilayered green's function. Any suggestions on how to proceed?
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