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FEM_SolverCalculixCxxtools.md

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---
- GuiCommand:
   Name: FEM SolverCalculixCxxtools
   MenuLocation: Solve -> Solver CalculiX Standard
   Workbenches: FEM_Workbench
   Shortcut: **S** **X**
   SeeAlso: FEM_tutorial
---

FEM SolverCalculixCxxtools

Description

CalculiXccxTools enables usage of the CalculiX solver. It may be used for:

  1. Setting analysis parameters
  2. Selecting working directory
  3. Running the CalculiX solver

Usage

  1. A CalculiXcxxTools solver object is created automatically with the creation of an Analysis container. To create it manually, use one of the following alternatives:
    • Select Solve → Solver CalculiX Standard from the menu.
    • Press the S then X shortcut keys.
  2. Optionally change the properties of the CalculiXcxxTools solver object in the Property editor.
  3. Double click the CalculiXcxxTools solver object.
  4. Select the Analysis type.
  5. Click the Write .inp file button.
  6. Click the Run CalculiX button.

Options

Click the Edit .inp file button to display and edit the CalculiX input file manually before running the analysis. In that case it can be useful to set the Split Input Writer property to {{True}}.

Properties

Default values can be set in the menu Edit → Preferences → FEM → CalculiX

  • Analysis Type:
-   static
-   frequency
-   thermomech - for mechanical and thermal loads
-   check - to check only the mesh
-   buckling - for buckling analyses <small>(v0.20)</small>
  • Beam Shell Result Output 3D: note that CalculiX internally expands 1D and 2D elements into 3D elements to accomplish FE analysis
-   false - results of 1D and 2D elements will be averaged to the nodes of original 1D or 2D mesh (i.e. purely bended beam will show 0 nodal stresses due to averaging)
-   true - resulting mesh will contain 1D and 2D elements expanded to 3D elements

  • Eigenmode High Limit: Eigenvalues above this limit will not be calculated; Note: if eigenvalues of the model are above the high limit, CalculiX will finish without output

  • Eigenmode Low Limit: Eigenvalues below this limit will not be calculated

  • Eigenmodes Count: number of lowest eigenmodes to be calculated

  • Geometric Nonlinearity:

-   linear - linear analysis will be performed if model does not contain nonlinear material
-   nonlinear - nonlinear analysis will be performed

  • Iterations Control parameter Cutb: defines the second line of CalculiX' advanced iteration parameters. Used if Iterations Control Parameter Time Use is set to true.

  • Iterations Control Parameter Iter: defines the first line of CalculiX' advanced iteration parameters. Used if Iterations Control Parameter Time Use is set to true.

  • Iterations Control Parameter Time Use- true - activates Iterations Control parameter Cutb and Iterations Control Parameter Iter - false

  • Iterations Thermo Mech Maximum: maximum number of increments in thermomechanical analysis after which the job will be stopped.

  • Iterations User Defined Incrementations:

-   true - automatic incrementation control will be switched off by DIRECT parameter
-   false - incrementation control will be automatic
  • Iterations User Defined Time Step Length:
-   true - activates **Time End** and **Time Initial Step** parameters
-   false
  • Material Nonlinearity:
-   linear - only linear material properties will be included in the analysis
-   nonlinear - nonlinear material properties will be used from **<img src="images/FEM_MaterialMechanicalNonlinear.svg" width=24px> [Nonlinear mechanical material](FEM_MaterialMechanicalNonlinear.md)** object
  • Matrix Solver Type: type of the solver to solve equation system inside FE analysis. It may significantly affect calculation speed and memory demands. Suitability depends on your FE model and available hardware
-   default - automatically selects matrix solver depending on available solvers (probably it will be Spooles)
-   spooles - direct solver with support of multiple CPUs. Number of CPUs need to be set in the [preferences](FEM_Preferences#CalculiX.md) at *Solver defaults → Number of CPU\'s to use*.
-   iterativescaling - iterative solver with least memory demands, suitable if model contains mostly 3D elements
-   iterativecholesky - iterative solver with preconditioning with and with low memory demands, suitable if model contains mostly 3D elements
  • Split Input Writer:
-   false - write whole input into one \*.inp file to be used by CalculiX solver
-   true - split solver inputs into more \*.inp files, that can clarify hand editing
  • Thermo Mechanical Steady State:
-   true - steady state thermo mechanical analysis
-   false - transient thermo mechanical analysis

  • Time End: time period of the step, used when parameter Iterations User Defined Incrementations or Iterations User Defined Time Step Length is true

  • Time Initial Step: initial time increment of the step, used when parameter Iterations User Defined Incrementations or Iterations User Defined Time Step Length is true

  • Working Dir: path to the working directory which will be used for CalculiX analysis files.

Limitations

When running a CalculiX, you might end up with error 4294977295. This means you don't have enough RAM space. You have then 2 options:

  1. reduce the number of mesh nodes, preferably by omitting geometry that is not absolutely necessary for your analysis
  2. buy more RAM for your PC

Notes

Original CalculiX documentation can be found at http://dhondt.de/ in the "ccx" paragraph.

Scripting

{{FEM Tools navi}}

⏵ documentation index > FEM > FEM SolverCalculixCxxtools