# Tag Info

### Solid Mechanics FEM Simulation with Different Material Properties

This is probably something that should be shown in the documentation and I'll add this. Here is how to do it. The compliance matrix needs to be given as a matrix. So using paradigms like ...

### Solid Mechanics FEM Simulation with Different Material Properties

This is answer for the first question about titanium and nickel usage in one installation, and for the last question about how to speed up evaluation. First step is a mesh generation and visualization ...

### Solid Mechanics FEM Simulation with Different Material Properties

With the help of user21, the following code simulates the Eigenmodes of a solid component with two different densities and compliance matrices based on position within the mesh. ...
Accepted

### Displaying NDEigensystem Results

Use VectorDisplacementPlot3D, however, the domain needs to reference the original geometric solid or boundary mesh region (the method I recommend ...

### NDEigensystem potential with a singularity

Since your potential is singular at the origin, an additional condition is needed: vanishing function at $x=0$. Replacing {x, -l, l} by {x, 0, l} with l=4 does the work.

### How can i know the number of times that an eigenvalue is degenerate for a large matrix?

If your memory is big enough to compute the orthogonal projector to the complement of each eigenvector and look for another eigenvalue of the same value in the projected matrix ...
1 vote
Accepted

### Optimal basis set of Gaussian functions for describing a quantum system (part 2)

In the paper "Hydrogen-Like Systems in Arbitrary Magnetic Fields. A Variational Approach" the method to optimize basis functions has been proposed. They described basis functions dependent ...

### Optimal basis set of Gaussian functions for describing a quantum system (part 1)

Maxwell: There are three forms of fields: |E|=|B| light, |E|>|B| electric fields with a bit of movement of charges. |E|<|B| magetic fields of strong neutral current or worse spin fields on ...
1 vote
Accepted

### How to expand the existing basis set so that it becomes more complete?

Its a pure mathematical question. In cylindrical coordinates with an atractive plane 1/r Coulomb potential and and a harmonic oscillator in the x,y plane, in states with plane integer angular momentum ...