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Revision as of 17:48, 20 October 2023

FEM LöserCalculixCxxtools

Menüeintrag
Lösen → Solver CalculiX Standard
Arbeitsbereich
FEM
Standardtastenkürzel
S X
Eingeführt in Version
-
Siehe auch
FEM Tutorium

Beschreibung

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

Anwendung

  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.

Optionen

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 DatenSplit Input Writer property to true.

Eigenschaften

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

  • DatenAnalysis Type:
    • static
    • frequency
    • thermomech - for mechanical and thermal loads
    • check - to check only the mesh
    • buckling - for buckling analyses introduced in version 0.20
  • DatenBeam 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
  • DatenEigenmode 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
  • DatenEigenmode Low Limit: Eigenvalues below this limit will not be calculated
  • DatenEigenmodes Count: number of lowest eigenmodes to be calculated
  • DatenGeometric Nonlinearity:
    • linear - linear analysis will be performed if model does not contain nonlinear material
    • nonlinear - nonlinear analysis will be performed
  • DatenIterations Control Parameter Time Use
    • true - activates DatenIterations Control parameter Cutb and DatenIterations Control Parameter Iter
    • false
  • DatenIterations Thermo Mech Maximum: maximum number of increments in thermomechanical analysis after which the job will be stopped.
  • DatenIterations User Defined Incrementations:
    • true - automatic incrementation control will be switched off by DIRECT parameter
    • false - incrementation control will be automatic
  • DatenIterations User Defined Time Step Length:
    • true - activates DatenTime End and DatenTime Initial Step parameters
    • false
  • DatenMaterial Nonlinearity:
    • linear - only linear material properties will be included in the analysis
    • nonlinear - nonlinear material properties will be used from Nonlinear mechanical material object
  • DatenMatrix 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 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
  • DatenSplit 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
  • DatenThermo Mechanical Steady State:
    • true - steady state thermo mechanical analysis
    • false - transient thermo mechanical analysis
  • DatenTime End: time period of the step, used when parameter DatenIterations User Defined Incrementations or DatenIterations User Defined Time Step Length is true
  • DatenTime Initial Step: initial time increment of the step, used when parameter DatenIterations User Defined Incrementations or DatenIterations User Defined Time Step Length is true
  • DatenWorking 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

Hinweise

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

Skripten