GreensFns

Full name:

pylith.problems.GreensFns

Journal name:

greensfns

Static Green’s function problem type with each Green’s function corresponding to a fault slip impulses.

Implements Problem.

Pyre Facilities

• bc: Boundary conditions.

  • current value: ‘emptybin’, from {default}

  • configurable as: emptybin, bc

• defaults: Default options for problem.

  • current value: ‘problem_defaults’, from {default}

  • configurable as: problem_defaults, defaults

• gravity_field: Database used for gravity field.

  • current value: ‘nullcomponent’, from {default}

  • configurable as: nullcomponent, gravity_field

• interfaces: Interior surfaces with constraints or constitutive models.

  • current value: ‘emptybin’, from {default}

  • configurable as: emptybin, interfaces

• materials: Materials in problem.

  • current value: ‘homogeneous’, from {default}

  • configurable as: homogeneous, materials

• normalizer: Nondimensionalizer for problem.

  • current value: ‘nondimelasticquasistatic’, from {default}

  • configurable as: nondimelasticquasistatic, normalizer

• petsc_defaults: Flags controlling which default PETSc options to use.

  • current value: ‘petscdefaults’, from {default}

  • configurable as: petscdefaults, petsc_defaults

• progress_monitor: Simple progress monitor via text file.

  • current value: ‘progressmonitorstep’, from {default}

  • configurable as: progressmonitorstep, progress_monitor

• solution: Solution field for problem.

  • current value: ‘solution’, from {default}

  • configurable as: solution

• solution_observers: Observers (e.g., output) for solution.

  • current value: ‘singlesolnobserver’, from {default}

  • configurable as: singlesolnobserver, solution_observers

Pyre Properties

• formulation=<str>: Formulation for equations.

  • default value: ‘quasistatic’

  • current value: ‘quasistatic’, from {default}

  • validator: (in [‘quasistatic’, ‘dynamic’, ‘dynamic_imex’])

• label=<str>: Name of label identifier for fault surface on which to impose impulses.

  • default value: ‘fault’

  • current value: ‘fault’, from {default}

• label_value=<int>: Value of label identifier for fault surface on which to impose impulses.

  • default value: 1

  • current value: 1, from {default}

• solver=<str>: Type of solver to use [‘linear’, ‘nonlinear’].

  • default value: ‘nonlinear’

  • current value: ‘nonlinear’, from {default}

  • validator: (in [‘linear’, ‘nonlinear’])

Example

Example of setting GreensFns Pyre properties and facilities in a parameter file.

[pylithapp]
problem = pylith.problems.GreensFns

[pylithapp.greensfns]
label = fault
label_value = 1

# Set appropriate default solver settings.
set_solver_defaults = True

interfaces = [fault]
interfaces.fault = pylith.faults.FaultCohesiveImpulses

[pylithapp.greensfns.interfaces.fault]
label = fault
label_value = 20

# Impulses for left-lateral slip (dof=1)
impulse_dof = [1]
threshold = 0.5

# Create impulses at all points on the fault by specifying a uniform amplitude of 1.0.
# Impulses will be applied at any location with a slip component greater than the threshold.
db_auxiliary_field = spatialdata.spatialdb.UniformDB
db_auxiliary_field.description = Slip impulse amplitude
db_auxiliary_field.values = [slip_left_lateral, slip_opening]
db_auxiliary_field.data = [1.0*m, 0.0*m]

# Represent the impulse as a linear variation in slip centered on each point.
auxiliary_subfields.slip.basis_order = 1

[pylithapp.greensfns.petsc_defaults]
solver = True
monitors = True