Solver
Error: Failed to Find a Solution. Returned Solution is Not Converged
Solution Number: 964 Versions: All versionsI get this message: Failed to find a solution. The relative residual (0.28) is greater than the relative tolerance. Returned solution is not converged. Messages similar to this are returned for nonlinear problems ...
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 ...
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 ...
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 ...
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 ...