Using GridPACK

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Configuration

Math Library Configuration

• XML Tags
• Global PETSc options are read from gridpack.petscrc if it exists in the current working directory.

Linear Solver

GridPACK applications that use instances of the LinearSolver class are configured using the <LinearSolver> XML tag. The contents of the <LinearSolver> tag can containing any of the following tags:

• <MaxIterations> (integer) which indicates the maximum number of iterations the linear solver is to perform. When using a direct method, the contents of this tag should be "1".
• <SolutionTolerance> (real) the absolute residual of the linear system below which the system is considered solved and iterations stop.
• <RelativeTolerance> (real) the relative change in solution residuals below which the system is considered solved and iterations stop.
• <PETScOptions> (string) PETSc options, formatted as command line options, used to specify solver methods.
• <PETScPrefix> (string) a prefix that is to be added to options specified in the PETScOptions.

Method	<PETScOptions> Contents	Notes
LU (serial)	-ksp_type pc_only -pc_type lu -pc_factor_mat_solver_package petsc	<MaxIterations> should be 1.
LU (parallel)	-ksp_type richardson -pc_type lu -pc_factor_mat_solver_package superlu_dist	<MaxIterations> should be 1.