2.11.7. linear_solver{ }

Calling sequence

strain{ linear_solver{ } }

Properties

usage: \(\mathrm{\textcolor{Dandelion}{conditional}}\)
items: maximum 1

Dependencies

minimized_strain{ } must be defined.
This group is not allowed if any of no_strain{ }, pseudomorphic_strain{ }, and import_strain{ } is defined.

Functionality

—

Example

strain{
    minimized_strain{}
    linear_solver{}
}

Nested keywords

iterations

Calling sequence

strain{ linear_solver{ iterations } }

Properties

usage: \(\mathrm{\textcolor{ForestGreen}{optional}}\)
type: integer
values: \(z \geq 1\)
default: \(z=10000\)
unit: \(\mathrm{-}\)

Functionality

Number of iterations for linear equation solver in strain algorithm

Example

strain{
    minimized_strain{}
    linear_solver{
        iterations = 50000
    }
}

abs_accuracy

Calling sequence

strain{ linear_solver{ abs_accuracy } }

Properties

usage: \(\mathrm{\textcolor{ForestGreen}{optional}}\)
type: real number
values: [0.0, ...)
default: \(r=1e-8\)
unit: \(\mathrm{GP\,}\) for 1D; \(\mathrm{GP\,nm\,}\) for 2D; \(\mathrm{GP\,nm^{2}\,}\) for 3D

Functionality

—

Example

strain{
    minimized_strain{}
    linear_solver{
        abs_accuracy = 1e-9
    }
}

rel_accuracy

Calling sequence

strain{ linear_solver{ rel_accuracy } }

Properties

usage: \(\mathrm{\textcolor{ForestGreen}{optional}}\)
type: real number
values: \(0.0 \leq r \leq 10^{-6}\)
default: \(r=1e-12\)
unit: \(\mathrm{-}\)

Functionality

—

Example

strain{
    minimized_strain{}
    linear_solver{
        rel_accuracy = 1e-10
    }
}

use_cscg

Calling sequence

strain{ linear_solver{ use_cscg } }

Properties

usage: \(\mathrm{\textcolor{ForestGreen}{optional}}\)
type: choice
values: yes or no
default: no

Functionality

Composite step conjugate gradient solver (try this one if standard solver fails to converge)

Example

strain{
    minimized_strain{}
    linear_solver{
        use_cscg = yes
    }
}

force_diagonal_preconditioner

Calling sequence

strain{ linear_solver{ force_diagonal_preconditioner } }

Properties

usage: \(\mathrm{\textcolor{ForestGreen}{optional}}\)
type: choice
values: yes or no
default: no

Functionality

—

Example

strain{
    minimized_strain{}
    linear_solver{
        force_diagonal_preconditioner = yes
    }
}

Last update: 02/04/2025