/usr/share/ElmerGUI/edf-extra/helmholtz.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="Helmholtz Equation" >
<Name>Helmholtz Equation</Name>
<Equation>
<Parameter Widget="Label">
<Name> Options </Name>
</Parameter>
<Parameter Widget="Edit">
<Name> Angular Frequency </Name>
</Parameter>
<Parameter Widget="Label" >
<Name> Convection</Name>
</Parameter>
<Parameter Widget="Edit">
<Name> Convection Velocity 1</Name>
</Parameter>
<Parameter Widget="Edit">
<Name> Convection Velocity 2</Name>
</Parameter>
<Parameter Widget="Edit">
<Name> Convection Velocity 3</Name>
</Parameter>
<Parameter Widget="Label" > <Name> This and that </Name> </Parameter>
<Parameter Widget="Edit">
<Name> Element Codes </Name>
<SifName> Element </SifName>
<Whatis> Define element degrees of freedom (p:n d:n n:n e:n f:n b:n d:n). "p" is the p-element degree, "e" number of edge DOFs, "f" number of face DOFs, "b" number of bubble DOFs, and "d" the Discontinuous Galerkin DOFs (0 = element number of nodes). "p" and "b" may be entered together, "d" on its own, and the rest together. </Whatis>
</Parameter>
<Parameter Widget="Label">
<Name> Free text input </Name>
</Parameter>
<Parameter Widget="TextEdit" Enabled="True">
<Name> Free text </Name>
<Type> String </Type>
<Whatis> Free text is copied into the Equation-block of the SIF as such. </Whatis>
<StatusTip> Free text is copied into the Equation-block of the SIF as such. </StatusTip>
</Parameter>
</Equation>
<Solver>
<Parameter Widget="Edit" >
<Name > Procedure </Name>
<DefaultValue> "HelmholtzSolve" "HelmholtzSolver" </DefaultValue>
</Parameter>
<Parameter Widget="Edit" Enabled="False">
<Name> Variable </Name>
<DefaultValue> Pressure Wave(2) </DefaultValue>
</Parameter>
<Parameter Widget="Label"> <Name>Additional Variables</Name> </Parameter>
<Parameter Widget="Edit">
<Name> Exported Variable 1 </Name>
<Activate> /Helmholtz Equation/Solver/Exported Variable 2</Activate>
</Parameter>
<Parameter Widget="Edit" Enabled="False" Visible="False">
<Name> Exported Variable 2 </Name>
<Activate> /Helmholtz Equation/Solver/Exported Variable 3</Activate>
</Parameter>
<Parameter Widget="Edit" Enabled="False" Visible="False">
<Name> Exported Variable 3 </Name>
<Activate> /Helmholtz Equation/Solver/Exported Variable 4</Activate>
</Parameter>
<Parameter Widget="Edit" Enabled="False" Visible="False">
<Name> Exported Variable 4 </Name>
<Activate> /Helmholtz Equation/Solver/Exported Variable 5</Activate>
</Parameter>
<Parameter Widget="Edit" Enabled="False" Visible="False">
<Name> Exported Variable 5 </Name>
</Parameter>
<Parameter Widget="Label"> <Name> Miscellaneous options </Name> </Parameter>
<Parameter Widget="CheckBox">
<Name> Calculate Loads </Name>
<Whatis> If checked compute boundary reaction forces. </Whatis>
</Parameter>
<Parameter Widget="Label">
<Name> Free text input </Name>
</Parameter>
<Parameter Widget="TextEdit" Enabled="True">
<Name> Free text </Name>
<Type> String </Type>
<Whatis> Free text is copied into the Solver-block of the SIF as such. </Whatis>
<StatusTip> Free text is copied into the Solver-block of the SIF as such. </StatusTip>
</Parameter>
</Solver>
<BodyForce>
<Parameter Widget="Label" > <Name> Volume sources </Name> </Parameter>
<Parameter Widget="Edit">
<Name> Volume source 1 (real part)</Name>
<SifName> Pressure Wave Source 1 </SifName>
</Parameter>
<Parameter Widget="Edit">
<Name> Volume source 2 (imag part)</Name>
<SifName> Pressure Wave Source 2 </SifName>
</Parameter>
<Parameter Widget="Label">
<Name> Free text input </Name>
</Parameter>
<Parameter Widget="TextEdit" Enabled="True">
<Name> Free text </Name>
<Type> String </Type>
<Whatis> Free text is copied into the Body Force-block of the SIF as such. </Whatis>
<StatusTip> Free text is copied into the Body Force-block of the SIF as such. </StatusTip>
</Parameter>
</BodyForce>
<Material>
<Parameter Widget="Label" > <Name> Properties </Name> </Parameter>
<Parameter Widget="Edit" >
<Name> Damping coefficient </Name>
<SifName> Sound damping </SifName>
</Parameter>
<Parameter Widget="Edit" >
<Name> Sound speed </Name>
</Parameter>
<Parameter Widget="Label">
<Name> Free text input </Name>
</Parameter>
<Parameter Widget="TextEdit" Enabled="True">
<Name> Free text </Name>
<Type> String </Type>
<Whatis> Free text is copied into the Material-block of the SIF as such. </Whatis>
<StatusTip> Free text is copied into the Material-block of the SIF as such. </StatusTip>
</Parameter>
</Material>
<InitialCondition>
<Parameter Widget="Label" > <Name> Variables </Name> </Parameter>
<Parameter Widget="Edit">
<Name> Pressure wave 1 (real part)</Name>
<SifName> Pressure Wave 1 </SifName>
</Parameter>
<Parameter Widget="Edit">
<Name> Pressure wave 2 (imag part) </Name>
<SifName> Pressure Wave 2 </SifName>
</Parameter>
<Parameter Widget="Label">
<Name> Free text input </Name>
</Parameter>
<Parameter Widget="TextEdit" Enabled="True">
<Name> Free text </Name>
<Type> String </Type>
<Whatis> Free text is copied into the Initial Condition-block of the SIF as such. </Whatis>
<StatusTip> Free text is copied into the Initial Condition-block of the SIF as such. </StatusTip>
</Parameter>
</InitialCondition>
<BoundaryCondition>
<Parameter Widget="Label" > <Name> Dirichlet Conditions </Name> </Parameter>
<Parameter Widget="Edit">
<Name> Pressure Wave 1 (real part) </Name>
<SifName> Pressure Wave 1 </SifName>
<Activate> /Helmholtz Equation/BoundaryCondition/Pressure Wave 1 Condition </Activate>
</Parameter>
<Parameter Widget="Edit">
<Name> Pressure Wave 2 (imag part) </Name>
<SifName> Pressure Wave 2 </SifName>
<Activate> /Helmholtz Equation/BoundaryCondition/Pressure Wave 2 Condition </Activate>
</Parameter>
<Parameter Widget="Edit" Enabled="False">
<Name> Pressure Wave 1 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>
<StatusTip> Give pressure 1 condition value for this boundary. </StatusTip>
</Parameter>
<Parameter Widget="Edit" Enabled="False">
<Name> Pressure Wave 2 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>
<StatusTip> Give pressure 2 condition value for this boundary. </StatusTip>
</Parameter>
<Parameter Widget="Label" > <Name> Flux conditions </Name> </Parameter>
<Parameter Widget="Edit">
<Name> Real part of the flux</Name>
<SifName> Wave Flux 1 </SifName>
</Parameter>
<Parameter Widget="Edit">
<Name> Imag part of the flux</Name>
<SifName> Wave Flux 2 </SifName>
</Parameter>
<Parameter Widget="Edit">
<Name> Real part of the impedance </Name>
<SifName> Wave impedance 1 </SifName>
</Parameter>
<Parameter Widget="Edit">
<Name> Imag part of the impedance </Name>
<SifName> Wave impedance 2 </SifName>
</Parameter>
<Parameter Widget="Label"> <Name> Periodic boundary condition </Name> </Parameter>
<Parameter Widget="CheckBox" Enabled="False">
<Name> Pressure Wave 1 periodic </Name>
<SifName> Periodic BC Pressure Wave 1 </SifName>
</Parameter>
<Parameter Widget="CheckBox" Enabled="False">
<Name> Pressure Wave 2 periodic </Name>
<SifName> Periodic BC Pressure Wave 2 </SifName>
</Parameter>
<Parameter Widget="Label">
<Name> Free text input </Name>
</Parameter>
<Parameter Widget="TextEdit" Enabled="True">
<Name> Free text </Name>
<Type> String </Type>
<Whatis> Free text is copied into the Boundary Condition-block of the SIF as such. </Whatis>
<StatusTip> Free text is copied into the Boundary Condition-block of the SIF as such. </StatusTip>
</Parameter>
</BoundaryCondition>
</PDE>
</edf>
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