All Solutions

Computing Time and Space Integrals

Solution Number: 913 Versions: All versions

How 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 ...


Should I use the RMS, the peak, or the instantaneous value to specify sources in frequency-domain models?

Solution Number: 878 Applies to: COMSOL Multiphysics, AC/DC Module, RF Module, MEMS Module, Plasma Module, Acoustics Module, Wave Optics Module, Semiconductor Module Versions: All versions

Should I use the RMS, the peak, or the instantaneous value to specify sources in models being solved in the frequency domain, such as electromagnetic or acoustic models? How can I specify the phase angle? The COMSOL ...


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

Solution Number: 875 Versions: All versions

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 ...


How do I solve a PDE with space derivatives of order higher than two?

Solution Number: 816 Versions: All versions

How do I solve a PDE with space derivatives of order higher than two? For example, the equation for a function . Introduce names for the second derivatives of u, say . Then the equation can be written . ...


Handling large models

Solution Number: 830 Versions: All versions

Models 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 versions

You 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 ...


Could not obtain license for COMSOL Multiphysics GUI

Solution Number: 903 Versions: All versions

Any 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. ...


Can COMSOL import topological data, meshes and images?

Solution Number: 838 Versions: All versions

Can 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 versions

How 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 ...


What hardware do you recommend for COMSOL Multiphysics®?

Solution Number: 866 Versions: All versions

I am going to buy a new dedicated computer for running COMSOL Multiphysics®. What hardware do you recommend? Due to the wide range of different problem types that COMSOL Multiphysics® solves, the rapid pace of ...


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