Multigrid

Name PoissonSolverMGMaxCycles
Section Hamiltonian::Poisson::Multigrid
Type integer
Default 60

Maximum number of multigrid cycles that are performed if convergence is not achieved.

Name PoissonSolverMGPostsmoothingSteps
Section Hamiltonian::Poisson::Multigrid
Type integer
Default 4

Number of Gauss-Seidel smoothing steps after coarse-level correction in the multigrid Poisson solver.

Name PoissonSolverMGPresmoothingSteps
Section Hamiltonian::Poisson::Multigrid
Type integer
Default 1

Number of Gauss-Seidel smoothing steps before coarse-level correction in the multigrid Poisson solver.

Name PoissonSolverMGRelaxationFactor
Section Hamiltonian::Poisson::Multigrid
Type float

Relaxation factor of the relaxation operator used for the multigrid method. This is mainly for debugging, since overrelaxation does not help in a multigrid scheme. The default is 1.0, except 0.6666 for the gauss_jacobi method.

Name PoissonSolverMGRelaxationMethod
Section Hamiltonian::Poisson::Multigrid
Type integer

Method used to solve the linear system approximately in each grid for the multigrid procedure that solves Poisson equation. Default is gauss_seidel, unless curvilinear coordinates are used, in which case the default is gauss_jacobi.

Options:

• gauss_seidel:
  Gauss-Seidel.
  
• gauss_jacobi:
  Gauss-Jacobi.
  
• gauss_jacobi2:
  Alternative implementation of Gauss-Jacobi.
  

Name PoissonSolverMGRestrictionMethod
Section Hamiltonian::Poisson::Multigrid
Type integer
Default fullweight

Method used from fine-to-coarse grid transfer.

Options:

• injection:
  Injection
  
• fullweight:
  Fullweight restriction