/usr/share/ElmerGUI/edf-extra/poissonboltzmann.xml is in elmer-common 6.1.0.svn.5396.dfsg-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!DOCTYPE edf>
<edf version="1.0" >
<PDE Name="PoissonBoltzmann" >
<Name>Poisson-Boltzmann equation</Name>
<Material>
<Parameter Widget="Label" > <Name>Dimensional Properties </Name> </Parameter>
<Parameter Widget="Edit" >
<Name> Relative Permittivity </Name>
<Type> String </Type>
<Whatis> Give the relative permittivity compared to vacuum. </Whatis>
</Parameter>
<Parameter Widget="Edit" >
<Name> Reference Temperature </Name>
<Type> String </Type>
<Whatis> This keyword is used to give the temperature occuring in the Boltzmann factor. </Whatis>
</Parameter>
<Parameter Widget="Edit" >
<Name> Charge Number </Name>
<Type> String </Type>
<Whatis> For symmetric cases the charge number. For unsymmetric cases
one should give separately Positive Charge Number
and Negative Charge Number.
</Whatis>
</Parameter>
<Parameter Widget="Edit" >
<Name> Ion Density </Name>
<Type> String </Type>
<Whatis> For symmetric cases the original density of ions. For unsymmetric cases one should give separately Positive Ion Density and Negative Ion Density.
</Whatis>
</Parameter>
<Parameter Widget="Label" > <Name>Non-dimensional Properties </Name> </Parameter>
<Parameter Widget="Edit" >
<Name> Poisson Boltzmann Alpha </Name>
<Type> String </Type>
<Whatis> Parameter Alpha in the non-dimensionalized form of the PBE.</Whatis>
</Parameter>
<Parameter Widget="Edit" >
<Name> Poisson Boltzmann Beta </Name>
<Type> String </Type>
<Whatis> Parameter Beta in the non-dimensionalized form of the PBE.</Whatis>
</Parameter>
</Material>
<BodyForce>
<Parameter Widget="Label" > <Name> Properties </Name> </Parameter>
<Parameter Widget="Edit" >
<Name> Charge Density </Name>
<Type> String </Type>
<Whatis> Give the volume charge density. </Whatis>
</Parameter>
</BodyForce>
<InitialCondition>
<Parameter Widget="Label" > <Name> Properties </Name> </Parameter>
<Parameter Widget="Edit" >
<Name> Potential </Name>
<Type> String </Type>
<Whatis> Give the initial condition for electric potential. </Whatis>
</Parameter>
</InitialCondition>
<Solver>
<Parameter Widget="Edit" >
<Name> Procedure </Name>
<DefaultValue> "PoissonBoltzmannSolve" "PoissonBoltzmannSolve" </DefaultValue>
</Parameter>
<Parameter Widget="Edit">
<Name> Variable </Name>
<DefaultValue> Potential</DefaultValue>
</Parameter>
<Parameter Widget="CheckBox" >
<Name> Calculate Electric Field </Name>
<Type> Logical </Type>
<Whatis> Calculate the electric field from the electric potential. </Whatis>
</Parameter>
<Parameter Widget="CheckBox" >
<Name> Calculate Electric Charge </Name>
<Type> Logical </Type>
<Whatis> Calculate the electric charge from the electric potential. </Whatis>
</Parameter>
<Parameter Widget="CheckBox" >
<Name> Constant Weights </Name>
<Type> Logical </Type>
<Whatis> Use constant weights in computing nodal values of derived fields rather than weighing by element Jacobian. </Whatis>
</Parameter>
</Solver>
<BoundaryCondition>
<Parameter Widget="Label" > <Name> Dirichlet conditions </Name> </Parameter>
<Parameter Widget="Edit">
<Name> Potential </Name>
<Whatis> Give potential value for this boundary. </Whatis>
</Parameter>
<Parameter Widget="Edit">
<Name> Potential Condition </Name>
<Whatis> If the given value is less than zero, apply flux condition insted of the Dirichlet Condition. To be generally useful space and/or time varying values may be given. </Whatis>
</Parameter>
<Parameter Widget="Label" > <Name> Neumann conditions </Name> </Parameter>
<Parameter Widget="Edit">
<Name> Surface Charge </Name>
<Whatis> Give electric flux equivalent to the surface charge density. </Whatis>
</Parameter>
</BoundaryCondition>
</PDE>
</edf>
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