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Solver settings for COMSOL provides an overview of methods to obtain converged solution for cases with large numbers of degrees of freedom and nonlinearity. Either PARDISO or MUMPS are likely the fastest and SPOOLES will likely use the least memory.

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Maximum number of Newton iterations reached.

. There are two fundamental classes of algorithms that are used to solve for. Last time step is not converged. Sometimes the solver also works when the matrix is not positive definite especially if it is close to positive definite. There are direct solvers in COMSOL.

Right-click Stationary Solver 1 and choose Iterative. A model is solved by computing a solver configuration a scheme for computing a solution. We will introduce both of these methods and look at their general properties and relative performance below. This is how I am doing now.

Algebraic Multigrid AMG Solver for CFD. These are predefined solvers typically iterative solvers where we have made all necessary settings such that they apply to the selected single-physics or multiphysics. The smoothed aggregation algebraic. The Dense Matrix Solver should only be used for Boundary Element Method models.

All should converge to the same answer. If you need to use COMSOL buy a lot of memory to put the whole problem into one matrix. Navier-Stokes is a nonlinear problem per se. Last time step is not converged.

Typically such a solver configuration contains information about which physics interface and. It means the time you need to master it is huge. Posted 24 mag 2016 1120 GMT-4 Version 51 Version 52 4 Replies. Send Private Message Flag post as spam.

Browse all of the COMSOL Multiphysics version 53 updates relating to studies and solvers below. This book also has instructions about how to use COMSOL Multiphysics and how to access the electronic Documentation and Help content. The Direct solvers available within COMSOL Multiphysics are PARDISO MUMPS and SPOOLES as well as a Dense Matrix Solver. For a well-conditioned Finite Element problem these 3 solvers differ in their computation time to arrive at a solution but dont differ much in terms of their accuracy.

Nonlinear solver did not converge. It is an iterative method for linear systems of the form Ax b where the matrix A is positive definite and Hermitian symmetric. The direct solvers used by COMSOL are the MUMPS PARDISO and SPOOLES solvers. COMSOL Multiphysics version 53 includes a new solver for CFD simulations and a new solver for electromagnetic and corrosion boundary element method simulations.

CST is a professional tool oriented towards 3D Electromagnetic Simulation ready to use. Nonlinear solver did not converge. While PARDISO is the fastest SPOOLES happens to be the slowest algorithm among the 3 direct solvers in COMSOL. The COMSOL Multiphysics Reference Manual describes the core physics interfaces and functionality included with the COMSOL Multiphysics license.

COMSOL is a diff-equation solver Matlab like where you need to write your own code in order to full use its capabilities. Both are completely different solutions. When setting up and solving models using any of the physics from the Acoustics Module an add-on to the COMSOL Multiphysics software we generate so-called solver suggestions. I suppose it is good news and bad news that both solvers are converging for you.

As such a nonlinear method is used around each linear step. As you can see in the model attached. As you can see in the model attached COMSOL 44. Problems started to appear when using PML as mentioned in the user guide and we need to apply swept mesh in the PML region.

Maximum number of Newton iterations reached. Browse all of the COMSOL Multiphysics version 52a updates pertaining to studies and solvers below. Studies and Solver Updates. Please login with a confirmed email address before reporting spam I am solving a PDE in COMSOL with the eigenvalue solver.

That is the convergence progress you see in. The solver GMRES with multgrid SOR vector preconditioner with default settings seems to be the right way to go for me relatively fast convergence and memory usage. Geometry modelling is a difficult task however the import function does its wonders. Note the default Direct solver will become disabled afterwards Select the newly generated Iterative 1 solver in the setting window General section select Solver.

But the problem is hard to use for solving CFD problem using iterative solver. COMSOL Multiphysics version 52a includes new and updated solvers added support for absorbing layers for wave propagation in the time domain a new Multiphysics table for enabling and disabling multiphysics couplings in a study and more. The default solver selections are tuned to be the best they can be in a general sense. Right-click Iterative 1 solver and choose Multigrid.

Direct and iterative methods. Good news because at least you are getting converged solutions. For scientists who already deal with Matlab COMSOL is the obvious choice. This software is designed to solve multiphysics problems and is very open to user input new functions and other enhancements.

Eigenvalue solver in COMSOL. Expand Study Solver Configurations Solver 1 and Stationary Solver 1. The COMSOL blogs is a good place to start for example this. Loosely speaking a solver configuration consists of one or more Solution nodes and each Solution node consists of a sequence of subnodes specifying how to compute the solution.

This solver uses the conjugate gradients iterative method Ref. For your radiation case I would go with the COMSOL default solver settings unless you have a good reason to change.

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