Data

Description

N

Linear solver method number (solve Ax=b)

= 0: set to 1

= 1: Iterative solver. Preconditioned Conjugate Gradient (PCG)

= 2: Direct solver MUMPS

= 3: Direct

SMP: Boeing Solver (BCS)

SPMD: Massively parallel multi-frontal solver (MUMPS)

= 5: Mix - Two solvers will be used at same time. For instance, in SMP case, two solvers BCS and PCG will be used at same time.

SMP: BCS and PCG (Iprec =5)

SPMD: MUMPS and PCG (Iprec =5)

= 7: Auto (Comment 4)

Select automatic between solver direct and PCG (Iprec =5)

Iprec

Precondition methods

= 0: set to 5

= 1: No preconditioner

= 2: Diagonal Jacobi

= 5: Factored approximate inverse

It_max

Maximum iteration number used for stop criteria

= 0 or > NDOF: set to NDOF (system dimension)

Itol

Stop criteria for Preconditioned iterative solver flag

= 0: set to 3

= 1: Relative Residual of original matrix (residual r =Ax-b, ||r|| < Tol * ||b||)

= 2: Relative Residual of preconditioned matrix (||r|| < Tol * ||b’||)

= 3: Relative Residual of preconditioned matrix (||r|| < Tol * ||b’|| * ||A’|| * ||x||)

Tol

Input tolerance for stop criteria

= 0.0: set to 1.0e-5, if Itol =1 or 2

set to machine simple precision, if Itol =3