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.. manual/packages/vertex-cfd/boundary_condition_inductionless_solid.rst
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.. _sec_boundary_condition_inductionless_solid:

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Boundary conditions for induction-less model in solid domains
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Boundary conditions available for the induction-less model in solid domains are described below. Their usage in the `Data` sublist is illustrated through representative examples.

Insulating wall boundary
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.. py:data:: Type

   :type: string
   :value: InsulatingWall
   :usage: Required
   :description: Insulating wall boundary condition that sets :math:`\sigma \partial_n \phi = 0` where :math:`\sigma` is the electrical conductivity.

.. literalinclude:: ../../../../examples/inputs/induction_less_mhd/solid_mhd_inverse_proportional_2d.xml
   :language: xml
   :linenos:
   :lines: 72-79

Fixed boundary
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.. py:data:: Type

   :type: string
   :value: Fixed
   :usage: Required
   :description: Sets a constant value for a given variable on the boundary.

.. py:data:: electric_potential Value

   :type: double
   :value: :math:`[-\infty,\infty]`
   :usage: Required
   :description: Constant electric potential value in Volts :math:`(V)` to set at the boundary.

.. literalinclude:: ../../../../examples/inputs/induction_less_mhd/solid_mhd_inverse_proportional_2d.xml
   :language: xml
   :linenos:
   :lines: 63-71

Extrapolate boundary
***********************

.. py:data:: Type

   :type: string
   :value: Extrapolate
   :usage: Required
   :description: Set the boundary electric potential and its gradient to the interior values.