Documentation du code de simulation numérique SUNFLUIDH

 &HomeData_PoissonSolver  SolverName="SOR-Redblack-MPI", 
                          Number_max_Grid= 5, 
                          Number_max_Cycle= 10,
                          Number_Iteration= 0,
                          Number_Iteration_FineToCoarseGrid= 1, 
                          Number_Iteration_CoarseToFineGrid= 5, 
                          Number_Iteration_CoarsestGrid= 10 ,
                          Relaxation_Coefficient= 1.7 ,
                          Convergence_Criterion= 1.D-15,
                          Off_Set_Poisson_Source_term= .false. /

• Type: Character string
• Selection of the iterative solver coupled with the multigrid method.
  • JACOBI : Successive Over Relaxed solver based on the Jacobi's method
  • SOR : Successive Over Relaxed solver based on the Gauss-Seidel method
  • SOR-Redblack : Successive Over Relaxed solver based on a “Red-Black” algorithm (useful with OpenMP-parallel computations)
  • SOR-Redblack-MPI : Successive Over Relaxed solver based on a “Red-Black” algorithm optimized for the domain decomposition approach (MPI-parallel computations)

• Type : Integer value
• Maximum number of grid levels used in the multigrid method.

• Type : Integer value
• Maximum number of V-cycles permitted in the multigrid method.

• Type : integer value
• Number of iterations performed by the SOR method in order to approach the solution on each grid level. This value is the same for any grid level of the Multigrid procedure.

• Type : integer value
• Number of iterations performed by the SOR solver during the restriction step of each V-cycle of the multigrid procedure. For some problems, the minimization of iterations during the restriction step can improve the time-performance of the code.
  BEWARE : this data is enabled only if the variable Number_Iteration= 0 or is removed from the Namelist.

• Type : integer value
• Number of iterations performed by the SOR solver on the coarsest grid of each V-cycle of the multigrid procedure.
  BEWARE : this data is enabled only if the variable Number_Iteration= 0 or is removed from the Namelist.

• Type : integer value
• Number of iterations performed by the SOR solver during the prolongation step of each V-cycle of the multigrid procedure.
  BEWARE : this data is enabled only if the variable Number_Iteration= 0 or is removed from the Namelist.

• Type : real value between one and two
• over-relaxation coefficient used in the SOR method.

• Type : real value
• The nV-cycle procedure of the multigrid method is stopped if the L2-norm of the Poisson equation's residu is lower than the criterion chosen.

• Type : Boolean value. Not for the release SUNFLUIDH_EDU.
• The source term is shifted from its averaged value such as its integral value over the domain is zero. This could facilitate the convergence in some particuliar cases. this option must be used with caution. For expert users only.