Output, print

This option is used to write variables to the print output files. It must be used as a sub-keyword of the *Output keyword. Set <set name> equal to the set name for which the output should be defined. In the subsequent line, the output variables are defined.

Restriction

The print output is intended to write detailed information for some selected nodes, elements or integration points of the model to files. To reduce access times, the print output files are kept open during the simulation.

On Ubuntu, the default limit for simultaneously open files is set to 1024. To accommodate this, numgeo restricts the number of open files to 300 per output type (node, element, or integration point). If the number of files per output type exceeds this limit, only the first 300 files will remain open during the simulation, while additional files will be closed after each write operation and reopened when needed. This behavior may negatively affect simulation performance. The same functionality is applied across platforms, including both Windows and Linux.

Node output

*Output, print
*Node, nset = <set name>
<variable 1>, ..., <variable n>

The available output variables are the same as for *Output, field (see *Output, field) with the addition of

• COORDS:

  The coordinates of the node in reference configuration.

Element output

This option is used to write element variables (stored at the element centroid) to the print output files. It must be used as a sub-keyword of the *Output keyword. Set <set name> equal to the element set name for which the output should be defined. In the subsequent line, the output variables are defined.

*Output, print
*Element, elset = <set name>
<variable 1>, ..., <variable n>

The available output variables are the same as for *Output, field (see *Output, field) with the addition of

• COORDS/COORDS_UPD:

  The coordinate of the centroid in reference or current configuration.

Integration point output

*Output, print
*Integration point, elset = <set name>
<variable 1>, ..., <variable n>

This option is used to write element variables (stored at integration points) to the print output files. It must be used as a sub-keyword of the *Output keyword. Set <set name> equal to the element set name for which the output should be defined. In the subsequent line, the output variables are defined.

The following variables are currently available:

• COORDS_IGP/COORDS_IGP_UPD:

  The coordinates of the integration points in reference or current configuration.

• S:

  Stress. Single (scalar) components \(\sigma_{ij}\) for \(i,j = \{x,y,z\}\) [F/A]. In case of porous elements \(\sigma_{ij}\) is always the "effective stress".

• vis_stressij:

  Viscous part of the stress contributed by the "mechanical viscosity" model. Single (scalar) components \(\sigma^{vis}_{ij}\) for \(i,j = \{1,2,3\}\) [F/A]. Only for materials where *Mechanical viscosity was defined.

• E:

  Strain. Single (scalar) components \(\varepsilon_{ij}\) for \(i,j = \{x,y,z\}\) [-]. [\(\varepsilon_{ij}\) is always the total strain, i.e. no distinction between elastic and plastic strain components s made.

• VOID:

  Void ratio. Scalar \(e\) [-]. This output is only available for porous elements.

• Sat_eff:

  Effective degree of saturation. Scalar \(S^e\). This output is only available for coupled porous elements.

• Sat_eff:

  Degree of saturation. Scalar \(S^w\). This output is only available for coupled porous elements with two fluids occupying the pore space.

• Phantom_Elasticity:

  Part of the stress components (requested by the keyword 'S') contributed by the "phantom elasticity" model. Single (scalar) components \(\sigma^{ph}_{ij}\) for \(i,j = \{1,2,3\}\) [F/A]. Only for materials where "*Phantom elasticity' was defined.

• Sets:

  Write the defined element sets (name + elements) to the output file. The set name equals the output name. The elements of the associated element set are given the (integer) value 1, all other elements are given the (integer) value 0.

• Mat:

  Write the material names and the associated element set as cell data to the output file. The material name is assigned to the output name. The elements of the associated element set are given the (integer) value 1, all other elements are given the (integer) value 0

Depending on the applied element type and material model, the label SVARS can be replaced by the name of the demanded output variable solemnly available for this specific element type/material model. Possible output variables for different material models can be found here *Material. If the <type> is user, the state variable number has to be directly specified, e.g. Statev1 or Statev20.

Output, user

*Output, user
*Node, nset = <set name>
<variable 1>, ..., <variable n>
*Element, elset = <set name>
<variable 1>, ..., <variable n>

This option is used to write variables to the user files, where the specified variables are written to (initial) user files explained in *Initial conditions. It must be used as a sub-keyword of the *Output keyword. Set <set name> equal to the set name for which the output should be defined. In the subsequent line, the output variables are defined.

Depending on the variables, the corresponding user routine will be automatically written. The following variables are currently available:

• Any node variable that it is solved for will be generating a user defined boundary condition file (see here). This user routine can then be called in a next step using the *UBoundary command in the input file.

• S_IGP

  The stress of the integration points. In this case, the user defined initial stress field file (see here) is generated.

• STATEV: The statev with the number [xx]. In this case, the user defined initial state field file (see here) is generated. For instance, STATEV1 is typically the internal void ratio of the constitutive model. For the HCA models (see here), STATEV100 is the strain amplitude. Please contact the developers if you need a specific state variable number for your output.

The user files generated can be read by the main program on the run using *Read State (see Read state).