# Tag Info

Accepted

### Visualising Maxwell's equations using MATLAB

Here I have an example: ...
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### Finite difference methods in cylindrical and spherical co-ordinate systems

There are basically two methods: You can disrectize the angular part via grid points, or you can discretize it via basis expansion. I will focus on spherical symmetry here, the cylindrical case is ...
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### How to solve a Poisson equation using the finite difference method when there is an object inside a domain?

If you have simple, grid-aligned interior objects or accuracy is not crucial then stick with the method you have described. If you need to accurately represent arbitrary boundary shapes then you're ...
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### I need to scale variables to solve a 2D PDE. What are the physical considerations of scaling?

I've found that if I reduce the radial domain to $8 \leq r \leq 20$, the condition number drops to ~10,000. This makes me think I need to scale my problem. I'm not sure how to do this, however, and I ...

### Calculation of the EFIE integral

A classic paper for evaluation of the integrals commonly present in computational electromagnetics (EM) is: D. R. Wilton, S. M. Rao, A. W. Glisson, D. H. Schaubert, O. M. Al-Bundak, and C. M. Butler, ...

### Minimum number of elements (mesh size) for electromagnetic simulation

The Maxwell system is a wave equation at heart, so your ansatz (the space where you seek solutions, the combination of your mesh and basis functions) must be able to faithfully represent waves. The ...
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### How to create a good preconditioner for a system of linear equations that is created with FEM applied on the time harming Maxwell eqution?

As a preamble, I would not expect that splitting $E$ into real/imaginary parts is very profitable. Normally, block 2x2 systems are motivated because one block of unknowns is "easier" to ...

### Which type of meshing is more suited for simulation of electromagnetic metamaterial unit cells?

As for any other domain, your mesh needs to be fine enough to resolve the features you have. This means that the mesh has to be finer than the geometric details of your unit cell, and it needs to be ...
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### Is it necessary to use Poisson - Boltzmann equation if I only need to build electrostatic potential from a PQR file?

So Is it neccesary to use Poisson - Boltzmann equation if I only need to build electrostatic potential from a PQR file? No. You can use Poisson. Since you know the positions of each point charge, ...
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### Finite Difference Beam Propagation Method problem

When you call Lapack's zgtsv, it doesn't just solve a tridiagonal system $Ax=b$. What it does first is perform an LU factorization (zgttrf) $A = LU$, where $L,U$ are lower- and upper-tridiagonal ...

### Simulate electric fields due to surface charges in simple circuits using python

ANSYS Maxwell is a Finite Element solver for Electromagnetism. So, I assume that you are looking for a Finite Element package that has a Python interface (or is written in Python). There are some ...