Questions tagged [electromagnetism]
For questions about modeling phenomena related to electromagnetic fields.
126 questions
0 votes
0 answers
64 views
Pulsed coil current distribution -- open source EM FEM
I was hoping to be pointed in the right direction. I wanted to model the current density distribution in a single turn pulsed coil that will carry 100KA. From that I can calculated things like joule ...
0 votes
0 answers
107 views
Do meshfree FEM techniques offer any advantages for electromagnetic solvers for problems with dielectric and ferromagnetic regions?
It is straightforward to apply standard FEM methods to static electromagnetic problems which involve electrically and magnetically polarizable materials. In some cases a challenge is getting the ...
- 1,152
1 vote
0 answers
57 views
Why does MOM fail for large number of subdivision for finite dipole?
In Constantine A. Balanis' book about antennas, he introduced the method of moments for current distribution over a finite dipole. I found that the method of moments works very bad for a half-...
- 121
1 vote
0 answers
77 views
Does the method of moments works for wave-length dipole?
In Constantine A. Balanis book about Antenna, he introduced the method of moments for current distribution over finite dipole. However, I found that the method of moments works well for a half-...
- 121
6 votes
1 answer
988 views
Electromagnetic Eigenvalue problem in FEM yielding spurious solutions
I have written an Electromagnetic FEM solver for waveguide Eigenvalue problems. I already wrote it in two different libraries, sparselizard and dolfinx. The relevant scripts are available here for ...
- 61
2 votes
0 answers
100 views
Field profiles using Transfer Matrix Method
I am using the Transfer Matrix Method to compute optical properties such as reflectivity, transmittance as well as to obtain guided modes for multilayer structures. Following the formalist presented ...
0 votes
0 answers
90 views
FDTD boundary condition that replicates an infinitely thin mirror
I'm currently running a 1-D FDTD simulation where I want to model a dielectric mirror (with an anti-reflection coating on one side but let's keep it simple for now). For my purposes, the mirror can be ...
- 1
1 vote
1 answer
164 views
How to Implement Analytical Magnetic Field Equations into a Physics-Informed Neural Network (PINN) in PyTorch?
I'm working on a project that involves modeling the magnetic field around Europa, one of Jupiter's moons, using a Physics-Informed Neural Network (PINN) in PyTorch. My goal is to implement analytical ...
- 11
0 votes
0 answers
96 views
Calculating a 2D Ewald sum for a multipolar expansion
I am attempting to calculate the potential of a particle at the center of an infinite two-dimensional lattice as per the following reference: Reference: Lambin, PH & Senet, P. Ewald Summation of ...
- 43
3 votes
0 answers
238 views
Numerical integration in Fourier space over 3D grid
I am attempting to implement a model outlined in this paper: General magnetostatic shape–shape interactions Background This model allows the calculation of magnetostatic interaction energies between ...
- 43
4 votes
1 answer
711 views
Is my differential equation solving code wrong?
I am trying to simulate LLG equation without damping. The equation is $$\frac{d\vec{m}}{dt} = \vec{m}\times\vec{H}$$ I am solving in spherical coordinates as LLG equation is known to have problems in ...
- 141
2 votes
0 answers
108 views
In electromagnetic simulation, how much does the feed model impact an antenna's directivity performance and E-field phase readings?
Question: How much would a simplified feed model in an EM simulation alter an antenna's directivity and the E-field phase reading when compared to using a more complicated/realistic feed model? I am ...
- 21
1 vote
0 answers
50 views
Spectral Intensity of complex signal
I'm simulating an electromagnetic wave that has a real and imaginary part. Something like: $$ E(x,t) = A(x,t) e^{-i(\omega t - k x)} $$ Where $A(x,t)$ is some complex amplitude. Then taking the ...
- 11
1 vote
1 answer
354 views
Euler's Method for fast moving particle trajectory
I'm trying to figure out how a magnet affects the trajectory of a particle travelling near the speed of light downwards toward the ground. The equation for the force of the magnetic field is pretty ...
- 111
1 vote
0 answers
69 views
Stress and periodic boundary conditions
In the textbook definition of the stress tensor it is defined at each point in space and therefore position dependant. When three dimensional periodic boundary conditions are used, I have seen it ...
- 11