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03.08.2015 · Very big difference in the results between direct and iterative solvers. I am trying to solve a 3D Model using the MEF physics in the frequency Domain. With a rather coarse mesh I am able to solve the model (DoF~1e6) with the direct solver (PARDISO) and the global results (resistive losses) are what I expect.

An image from a model in Comsol Multiphysics shows a 3D ... For example, what are known as direct solvers solve problems with Gauss ...

I have a multiphysics problem in COMSOL involving the laplace equation, navier stokes equations and heat transfer. When I use the direct ...

Direct. The Direct node () is an attribute that handles settings for direct linear system solvers. Use it together with a Stationary Solver, Eigenvalue Solver, and Time-Dependent Solver, for example. The attribute can also be used together with the Coarse Solver attribute when using multigrid linear system solvers.

Nov 11, 2013 · Concluding Thoughts on Direct and Iterative Solution Methods. When solving the systems of linear equations of a simulation, COMSOL will automatically detect the best solver without requiring any user interaction. The direct solvers will use more memory than the iterative solvers, but can be more robust. Iterative solvers approach the solution ...

Iterative linear solvers; BLOG Model Vortex Lattice Formation in a Bose–Einstein ... use a FGMRES iterative solver instead of the default direct solver, ...

of a model. 5) Solving the system of equations. The matrix system is solved using either direct or iterative methods. B. Parallel Computing and Speedup.

For the iterative linear solvers you can also select a preconditioner. The stationary solver normally chooses a linear or nonlinear solver depending on the.

The direct solvers will use more memory than the iterative solvers, but can be more robust. Iterative solvers approach the solution gradually, ...

Jul 30, 2015 · Very big difference in the results between direct and iterative solvers. I am trying to solve a 3D Model using the MEF physics in the frequency Domain. With a rather coarse mesh I am able to solve the model (DoF~1e6) with the direct solver (PARDISO) and the global results (resistive losses) are what I expect.

Fully Coupled Versus Segregated Solution Approach

In the auto solve mode of COMSOL, the solver automatically selects the step size it ... of linear equations in COMSOL, namely Direct and Iterative methods.

Direct. The Direct node () is an attribute that handles settings for direct linear system solvers. Use it together with a Stationary Solver, Eigenvalue Solver, and Time-Dependent Solver, for example. The attribute can also be used together with the Coarse Solver attribute when using multigrid linear system solvers.

In contrast to the direct solver, the iterative solver starts by assuming an approximate solution for the unknowns {u}. The solution is iterated ...