DirichletTimeDependent#

Full name:

pylith.bc.DirichletTimeDependent

Journal name:

dirichlettimedependent

Dirichlet (prescribed values) time-dependent boundary condition.

This boundary condition sets values of a single solution subfield on a boundary. To set multiple solution subfields on a boundary, use multiple Dirichlet boundary conditions.

See also

See AuxSubfieldsTimeDependent Component for the functional form of the time depenence.

Implements BoundaryCondition.

Pyre Facilities#

  • auxiliary_subfields: Discretization information for auxiliary subfields.

    • current value: ‘auxiliary_subfields’, from {file=’/software/unix/py39-venv/pylith-debug/lib/python3.9/site-packages/pythia/pyre/inventory/ConfigurableClass.py’, line=26, function=’set’}

    • configurable as: auxiliary_subfields

  • db_auxiliary_field: Database for physical property parameters.

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

    • configurable as: simpledb, db_auxiliary_field

  • derived_subfields: Discretization of derived subfields.

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

    • configurable as: emptybin, derived_subfields

  • observers: Observers (e.g., output).

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

    • configurable as: singlephysicsobserver, observers

  • time_history: Time history with normalized amplitude.

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

    • configurable as: nullcomponent, time_history

Pyre Properties#

  • constrained_dof=<array>: Array of constrained degrees of freedom (0=1st DOF, 1=2nd DOF, etc).

    • default value: []

    • current value: [], from {default}

  • field=<str>: Solution subfield associated with boundary condition.

    • default value: ‘displacement’

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

  • label=<str>: Name of label identifying boundary.

    • default value: ‘’

    • current value: ‘’, from {default}

    • validator: <function validateLabel at 0x124bbc4c0>

  • label_value=<int>: Value of label identifying boundary (tag of physical group in Gmsh files).

    • default value: 1

    • current value: 1, from {default}

  • use_initial=<bool>: Use initial term in time-dependent expression.

    • default value: True

    • current value: True, from {default}

  • use_rate=<bool>: Use rate term in time-dependent expression.

    • default value: False

    • current value: False, from {default}

  • use_time_history=<bool>: Use time history term in time-dependent expression.

    • default value: False

    • current value: False, from {default}

Example#

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

# Dirichlet (prescribed displacements) boundary condition constraining the x and y degrees of freedom on the +y boundary.
[pylithapp.problem.bc.bc_ypos]
constrained_dof = [0, 1]
label = boundary_ypos
field = displacement

use_initial = False
use_time_history = True
db_auxiliary_field = spatialdata.spatialdb.UniformDB
db_auxiliary_field.description = Displacement Dirichlet BC +y boundary
db_auxiliary_field.values = [time_history_amplitude_x, time_history_amplitude_y, time_history_start_time]
db_auxiliary_field.data = [1.0*m, 0.0*m, 0.0]

time_history = spatialdata.spatialdb.TimeHistory
time_history.description = Impulse time history
time_history.filename = impulse.timedb