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1 vote

### How to set an initial guess for the iterative solver in Comsol?

I am not too familiar with the details of the iterative solve in Comsol; however, quick googling did reveal any easy way to set up a custom initial guess for an iterative linear solver. (I ready to be ...
• 8,672
1 vote

### temperature profile on axial direction of a chamber

You can use an interpolation function (see interp3) to estimate the temperature at each position in a cross-section. Set the extrapolation value to NaN so that points outside your chamber do not ...
• 11
1 vote
Accepted

### Mesh ordering algorithms used by COMSOL Multiphysics

Based on the comment by @TylerOlsen, I've applied the boost implementation of the reverse Cuthill-McKee ordering on the same matrix from the original question and here is the result: The structure ...
1 vote

### How does rigid body rotation affect resuts in a simulation?

Due to the Euler's rotation theorem a rigid body in 3D space has 3 rotational degrees of freedom, (plus 3 displacement degrees of freedom for a total of 6 degrees of freedom.). This typically means ...
• 3,829
1 vote

### Understanding Finite-Element Modal Analysis

If you are familiar with the standard FEM analysis works, the idea of modal analysis is straightforward. In standard FEM analysis, you transfer the time-dependent elastic wave equation (ignoring ...
• 12.3k
1 vote

### COMSOL: get list of eigenfrequencies

Under results node, there are Export and Reports options. Right click on Export will give you some options for exporting your data.
1 vote

### Different Meshes Different Maximum velocities

The finite element methods, i.e., what COMSOL uses internally, does not solve the problem exactly. It only (i) provides an approximation to the solution, and (ii) does so in a way for which we can ...
• 55.7k

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