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Solutions - Solver
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1034: Particle tracing feature gives unexpected results
The particle tracing feature in COMSOL Multiphysics sometimes gives unexpected results in Axial symmetry (2D) application modes. Workaround for...
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1030: Error message: "Out of memory"
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...
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1029: My transient 3.3 model does not work in version 3.4
I have a transient model that worked fine in COMSOL 3.3a but when I open it in version 3.4 and run it I get the error message
Error: Time 0: ...
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1025: Level Set method for two-phase flow, how does it compare with the...
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...
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1010: Error 7067, System matrix is zero
I get the error message "Error 7067, System matrix is zero". What can it be? The problem could be that you only made surface...
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1001: Running COMSOL in parallel mode
This solution describes how you enable parallel use of the processors on a multicore or multiprocessor computer. Introduction
COMSOL supports...
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984: How to do a parametric study for a time dependent or an eigenvalue...
I want to solve a time dependent or an eigenvalue problem for many different values of a parameter. Can this be done automatically? The parametric...
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964: Error message: Failed to find a solution: No convergence...
I get this message:
Failed to find a solution: Maximum number of Newton iterations reachedReturned solution has not converged. This message is...
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962: Which element types are supported in COMSOL Multiphysics?
How elements are defined and used in COMSOL MultiphysicsThe use of elements in defining a finite element model in COMSOL Multiphysics differs...
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952: Negative concentrations
Why do I get negative values of the concentration? There are several possible reasons for negative concentrations: Numerical errors The most common...
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935: Interpolation of measured data
I have data tables for my dependent material properties. For instance, I have values of the thermal conductivity at some different temperatures, and...
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921: Time-step control
How does COMSOL Multiphysics determine the time-step size? In all of the COMSOL Multiphysics solvers for time-dependent problems, the time step is...
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905: Smoothed step transitions in COMSOL Multiphysics
When you provide a function, coefficient or material property as a step function to COMSOL Multiphysics, you may experience convergence problems....
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877: What are the relative and absolute tolerance for a time dependent...
What are the relative and absolute tolerances (Rtol and Atol) for a time dependent problem? How do I know which values to give them? In the manual...
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875: What is meant by degrees of freedom (DOFs) in COMSOL Multiphysics?
What is meant by degrees of freedom (DOFs) in COMSOL Multiphysics? The solution time and memory requirements are strongly related to the number of...
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830: Handling memory intensive models
Handling memory intensive models Introduction
On 32-bit platforms there is a theoretical upper limit of addressable memory (physical RAM + disk swap...
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103: Convergence problems at high reaction rates (large source terms)
Problems with high reaction rates (high Ri), or more generally, large source terms, may result in convergence problems. You may for instance get...
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