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Mesh Solutions

1153: The meshing tutorials are missing after installing COMSOL 4.3.1.161

After I installed COMSOL 4.3.1.161, the meshing tutorials are missing in Model Library and they do not seem available for download through Model Library Update. When COMSOL 4.3.1.161 is installed, the meshing tutorials...
Version: 4.3a - Platform:

1118: Resolving time-dependent waves

I am solving a time-dependent wave problem, but the solution does not look quite right. I was expecting a smooth propagating waveform but see mostly noise.   The accuracy in a model solving an equation for...
Version: 4.2 - Platform: All Platforms

1103: Frequency-dependent meshing

I am solving a wave equation over a wide range of frequencies. At the highest frequencies, I need a very fine mesh in order to resolve the wavelength. For lower frequencies, I am happy with a coarser mesh. How do...
Version: 4.1,4.2 - Platform: All Platforms

1048: Error: 9040 IllegalArgumentException

When I open a 3D model from the model library, or create a a 3D object, for example by extrusion of a circle, or try to view a 2D mesh, I get an error message that includes any of the following strings: Error: 9040...
Version: 3.5a - Platform: All Platforms

1010: Error: System matrix is zero

I get the error message "System matrix is zero". What is the problem? The problem could be that you only made surface meshes on a 3D object, for example with the mapped mesh. If there are no...
Version: 3.5a,4.0,4.0a,4.1,4.2,4.2a - Platform: All Platforms

1004: Resolving the Skin Depth

Why do the currents in my metal look strange? How can I get a realistic solution at high frequencies? Not resolving the skin depth is one of the more common modeling mistakes in AC and RF applications. Luckily, in most...
Version: 4.0,4.0a,4.1,4.2 - Platform: All Platforms

1001: Running COMSOL in parallel on clusters

This solution describes how you enable distributed parallelization (cluster jobs) in COMSOL. COMSOL supports two mutual modes of parallel operation: shared-memory parallel operations and distributed-memory parallel...
Version: All versions - Platform: Windows,Linux

983: Error: Internal Error in Geometry Decomposition (General)

Why do I get the error message “Internal error in geometry decomposition”? [reference id="1089"]Note: if you use COMSOL 4 and have any of the CAD import products, please refer to [solution...
Version: All versions - Platform: All Platforms

902: Thin film approximation, contact resistance

In modeling of transport by diffusion or conduction in thin layers, we often encounter large differences in dimensions of the different subdomains in a model. If the modeled structure is a so-called sandwich...
Version: 3.5a,4.0,4.0a,4.1,4.2,4.2a - Platform: All Platforms

875: What does degrees of freedom (DOFs) mean in COMSOL Multiphysics?

What does degrees of freedom (DOFs) mean in COMSOL Multiphysics? The solution time and memory requirements are strongly related to the number of degrees of freedom in the model. It is often desirable to be able to...
Version: All versions - Platform: All Platforms