Avoiding negative concentrationsSolution Number: 952 Applies to: COMSOL Multiphysics, CFD Module, Chemical Reaction Engineering Module, Electrodeposition Module, Microfluidics Module, Subsurface Flow Module, Mixer Module, Corrosion Module, Electrochemistry Module Versions: All versions
Why 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 ...
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 ...
Handling large modelsSolution 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 transitionsSolution 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 ...
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Learning Center ResourcesLearn how to use the COMSOL Multiphysics® software for modeling devices, designs, and processes. Access the Learning Center courses and articles below for modeling guidelines, step-by-step demonstrations, and exercise files.
Examples of the General Extrusion Operator
Examples of the General Projection Operator
Integrating Along Streamlines and Extracting Particle Statistics
Copying and Reusing Boundary Mode Analysis Results
Modeling TEM and Quasi-TEM Transmission Lines
Examples of the withsol Operator
Applying Translations, Scaling, Reflection, and Rotation via the Deformed Geometry and Moving Mesh Interfaces