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I have an old contact model that was built in COMSOL Multiphysics 4.0a or earlier. Now that I am using a later version of COMSOL Multiphysics, how can I take advantage of the better stability of this version in my...
Version: All versions,4.1,4.2,4.2a,4.3,4.3a,4.3b - Platform: All Platforms

My time dependent model solves without any problem as long as I use only linear materials. How can I get it to converge with a nonlinear material? When a time dependent solver has trouble converging, its default...
Version: 4.2 - Platform: All Platforms

I am solving a time-dependent wave problem, but the solution does not look quite right. I was expecting a smooth propagating waveform but see mostly noise. The accuracy in a model solving an equation for...
Version: 4.2 - Platform: All Platforms

I am solving a wave equation over a wide range of frequencies. At the highest frequencies, I need a very fine mesh in order to resolve the wavelength. For lower frequencies, I am happy with a coarser mesh. How do...
Version: 4.1,4.2 - Platform: All Platforms

In this article, you can find both general tips of how to improve convergence in your contact model and how to change solver settings of older models. ## Some General Contact Tips * The choice of source and...
Version: All versions - Platform: All Platforms

This solution describes how COMSOL takes advantage of multicore computers. COMSOL supports two mutual modes of parallel operation: shared-memory parallel operations and distributed-memory parallel operations, including...
Version: 4.0,4.1,4.2 - Platform:

I get an error message that looks like: The following feature has encountered a problem: -Feature: Stationary Solver 1 (sol/s1)-Error: Cannot open native file. The problem is related to a Windows user name that...
Version: 4.1,4.2,4.2a - Platform: All Platforms

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,4.0,4.0a,4.2,4.3 - Platform: All Platforms

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: 3.5a - Platform: All Platforms

I get an error message, that contains the words Out of memory, for example: Nonlinear solver did not converge.Time: 0Out of memory during LU factorization.Last time step is not converged. or Failed to find consistent...
Version: 3.5a,4.0,4.0a,4.1,4.2,4.2a,4.3 - Platform: All Platforms

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