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I usually use the BDF time stepping method. But I have certain examples where the generalized alpha method is much better. What numerical method is used when I choose the Generalized alpha method? Is the Generalized...
Version: 3.5a,4.0 - Platform: All Platforms

COMSOL Multiphysics crashes or stops with an error message when I solve a model using multicore (parallel) support. This problem has been fixed in the 3.5a Hotfix 1 update. Select Help>Check For Updates to download...
Version: 3.5,3.5a - Platform: Windows

I have a COMSOL Multiphysics model that solves for V. In the source term (right-hand side) of the PDE, I use an analytic function of V, f1(V), that I have defined in the Options->Functions dialog box. I do not get...
Version: 3.5,3.5a - Platform: All Platforms

The particle tracing feature in COMSOL Multiphysics sometimes gives unexpected results in Axial symmetry (2D) application modes. This problem is corrected in COMSOL Multiphysics 3.5. If you are currently running an...
Version: 3.4 - Platform: Windows

The error message "Out of memory" occurs mostly on 32-bit platforms, due to the inherent limit in memory address space. We recommend a 64-bit system (for example Windows XP 64-bit Edition, Vista 64-bit or a 64-bit...
Version: 3.4,3.5,3.5a - Platform: All Platforms

I am new to COMSOL Multiphysics and have seen that you can use the Level Set method to track phase boundaries, for example in a rising bubble. I have heard of the Volume of Fluid method (VOF) before. What is the...
Version: 3.4 - Platform: All Platforms

I get the error message "System matrix is zero". What can it be? The problem could be that you only made surface meshes on a 3D object, for example with the mapped mesh. If there are no volume...
Version: 3.4,3.5,3.5a,4.0 - Platform: All Platforms

This solution describes how you enable parallel use of the processors on a multicore or multiprocessor computer. Introduction COMSOL 3.5 and later supports parallel computations on computers with multiple processors...
Version: 3.5,3.5a,4.0,4.0a - Platform: All Platforms

I get this message: Failed to find a solution:No convergence, even when using the minimum damping factor.Returned solution has not converged. This message is returned for nonlinear problems that fail to converge. More...
Version: 3.4,3.5,4.0 - Platform: All Platforms

Why do I get negative values of the concentration in my diffusion/convection model? It is clearly unphysical. There are several possible reasons for negative concentrations: Numerical errors The most common reason for...
Version: 3.4,3.5,3.5a - Platform: All Platforms

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