All Solutions
Avoiding Negative Concentrations
Solution Number: 952 Applies to: CFD Module, Chemical Reaction Engineering Module, COMSOL Multiphysics, Corrosion Module, Electrochemistry Module, Electrodeposition Module, Microfluidics Module, Mixer Module, Subsurface Flow Module Versions: All versionsWhy do I get negative values of the concentration in my diffusion, convection and reaction model? Why do I see values that go below, or above, their lowest, or highest, possible values based upon the boundary ...
Troubleshooting Graphics Issues
Solution Number: 933 Versions: All versionsI am experiencing graphics issues in COMSOL Multiphysics, what can I do about it? This entry is meant as listing general strategies when experiencing graphics issues in COMSOL Multiphysics. More problem-specific fixes ...
Computing Time and Space Integrals
Solution Number: 913 Versions: All versionsHow do I compute integrals over space or time? What if I want to use the result of these integrals elsewhere in my model? The COMSOL Multiphysics architecture allows you to evaluate integrals in both space and time in ...
How does COMSOL Multiphysics handle complex-valued numbers and problems in the frequency domain?
Solution Number: 878 Applies to: AC/DC Module, Acoustics Module, COMSOL Multiphysics, MEMS Module, Plasma Module, RF Module, Semiconductor Module, Structural Mechanics Module, Wave Optics Module Versions: All versionsHow does COMSOL Multiphysics handle complex-valued numbers and problems in the frequency domain? Should I use the RMS, the peak, or the instantaneous value to specify sources in models being solved in the frequency ...
What Does Degrees of Freedom (DOFs) Mean in COMSOL Multiphysics?
Solution Number: 875 Versions: All versionsWhat 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 ...
Handling Large Models
Solution Number: 830 Versions: All versionsModels with many domains, boundaries, and physics features are slow to work with. Large models can contain hundreds or even thousands of domains, boundaries, and physics features. Such a large number of features ...
Modeling of Step Transitions
Solution Number: 905 Versions: All versionsYou may want to define loads, material properties, or boundary conditions that vary abruptly with respect to the solution, or with respect to time. This can, however, lead to a solution which is discontinuous in space ...
Can COMSOL import topological data, meshes and images?
Solution Number: 838 Versions: All versionsCan COMSOL Multiphysics import meshes, topological data, and images? ##Importing Meshes Mimics and ScanIP can export volumetric meshes on COMSOL's own mesh format created from 3D scans, that can be directly imported ...
Obtaining a HostID for Licensing
Solution Number: 828 Versions: All versionsHow do I obtain a HostID for my license file? For many license types in the COMSOL product family, your COMSOL sales representative will ask you for some information in order to create installation codes. COMSOL uses ...
Could Not Obtain License for COMSOL Multiphysics GUI
Solution Number: 903 Versions: All versionsAny of the following errors can appear for example if the COMSOL application has problems communicating with the license manager: License error: -15. Cannot connect to license server system. License error: -96. ...