All Questions
Tagged with computational-physics electromagnetism
22
questions
0
votes
0
answers
31
views
Problems performing 1D-FDTD for dispersive dielectric uisng lorentz model in Julia
So I am trying to model a dispersive dielectric using the Lorentz model in Julia, more specifically I am trying to obtain the frequency-dependent reflectivity of the material. I am ultimately trying ...
4
votes
1
answer
669
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
1
vote
1
answer
310
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
44
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
1
vote
0
answers
31
views
How can the current-voltage relationship of a series of tunneling junctions be most easily computed?
I'm working on a research project with my professor where we're trying to figure out how to determine the necessary semiconductor composition for a solar cell to have a particular bandgap in order to ...
3
votes
1
answer
329
views
Finite element method for high-frequency electromagnetics
I am writing a project about the Finite element method for use in high-frequency solutions of Maxwell's equations. This could be for use in antenna design and similar.
I have some trouble ...
- 33
1
vote
1
answer
255
views
Electrostatic Force - Simulate Trajectory of Test Particle using Runge Kutta - Force always Repels
In the center of a 2D-Plane a positive static charge Q is placed with position r_prime. This charge creates a static electrical Field E.
Now i want to place a test particle with charge Q and position ...
- 35
1
vote
0
answers
441
views
More efficient way to calculate magnetic field using Biot-Savart
I am writing a program in python that is supposed to calculate the magnetic field along a conducting coil that is made up of a bunch of points, and the magnetic field is generated by other conducting ...
- 11
0
votes
0
answers
319
views
COMSOL Circularl polarization
I'm having some problems trying to implement circularly polarized light in COMSOL Muliphysics.
For a isotropic homogenous media, I've obtained without problems the TE and TM reflectance curves. ...
0
votes
0
answers
710
views
Parallel plate capacitor as simple superposition of Coulomb-fields
I am trying to calculate and visualize the electric field inside and outside of a parallel plate capacitor by assuming a uniform distribution of point charges on each plate and by adding up the ...
- 11
-1
votes
1
answer
115
views
Simulating magnetic particles in a field free point generated by two opposing magnets
This is probably a long shot with such a short time, but I've been trying to get theoretical data for a project I'm working on. The project involves using a very simplified version of magnetic ...
- 1
0
votes
1
answer
1k
views
Poincare map for Arnold-Beltrami-Childress Magnetic Field in Python
I want to plot the Poincare map for Arnold-Beltrami-Childress magnetic field for parameters $A=1, B=0.816, C=0.5773$ in Python for the Poincare section $z=0$.
Also, I am not able to understand what ...
0
votes
1
answer
127
views
Help understanding this numerical surface integration technique?
I'm attempting to write a FORTRAN program that calculates the magnetic field, B, at any point outside of a bar magnet.
I'm going to use a first order euler scheme, where each side of the bar magnet ...
- 3
1
vote
0
answers
121
views
Band structure of nonlinear Schrodinger equation with one dimensional potential
I have a nonlinear Schrodinger equation which reads:
$$ \frac{1}{2} \frac{d^2u}{dx^2}+ |u|^2u + V(x)u = -i \frac{du}{dz},$$
where $V(x)=\cos(wx)+ i a \sin(wx)$ and $w$, $a$ are numbers.
How to ...
- 11
1
vote
0
answers
81
views
Numerical scheme to solve Maxwell equations with fixed potential boundaries?
We have a 2D electromagnetic field (in the sense that: $E=(E_x,E_y,0)$, $B=(0,0,B_z)$, and all derivatives with respect to $z$ are $0$), and we are considering a system made up of two walls at $x=-b$ ...
- 53