The preferences screen of the FEM Workbench are found in the Preferences Editor, Edit → Preferences → FEM.
There are several tabs in the FEM workbench preferences, starting with the General configuration of the workbench. The rest of the tabs control how FEM interacts with supported external solvers.
The current supported external solvers are:
On the General tab you can specify the following:
+++ | Name | Description | +==========================================================+===========================================================================================================================+ | | In what directory the mesh and solver files should be stored | | Working directory | | | | | +++ | | If there are several meshes they will be grouped | | Create mesh groups | | | | | +++ | | Existing Result objects will be kept, otherwise overwritten by a new solver run | | Keep results on calculation re-run | | | | | +++ | | If checked, the Show result dialog is opened with the last used dialog settings | | Restore result dialog settings | | | | | +++ | | The constraints will be hidden in the model view when the Show result dialog is opened | | Hide constraints when open result dialog | | | | | +++ | | Default solver to be added when adding an Analysis container. ((v0.21) ) | | Default solver | | | | | +++
On the Gmsh tab you can specify the following:
+++ | Name | Description | +====================================================+=======================================================================================================================+ | | If checked, FreeCAD will look for the binary of Gmsh in known (usual) directories | | Search in known binary directories | | | | | +++ | | The path to the the binary of Gmsh | | Gmsh binary path | | | | | +++
On the CalculiX tab you can specify the following:
On the Elmer tab you can specify the following:
+++ | Name | Description | +=================================================================+===============================================================================================================================================================================================================================================+ | | If checked, FreeCAD will look for the binary of the grid writer utility of the Elmer in known (usual) directories | | ElmerGrid: Search in known binary directories | | | | | +++ | | The path to the the binary of the grid writer utility of the Elmer | | ElmerGrid binary path | | | | | +++ | | If checked, FreeCAD will look for the solver binary of Elmer in known (usual) directories | | ElmerSolver: Search in known binary directories | | | | | +++ | | The path to the the solver binary of Elmer | | ElmerSolver binary path | | | | | +++ | | The number of CPU cores that will be used to perform the solving. Important: Elmer divides the mesh into portions. The number of portions is equal to the number of CPU cores used. This can result in side-effects: | | CPU cores to be used | | | | - Depending on your mesh a smaller number of CPU cores can run faster than using more cores. | | | - In some cases using e.g. 12 cores does not converge while 8 cores will work fine. The reason is that at some point the mesh portions become too small. | | | | | | So it is often necessary to adjust the number of cores, depending on the mesh. | | | | | | Known limitation: For some simulation types you first need to install Elmer modules to enable multi-threading. Check the Elmer report for info about this. A typical case is that for direct solving one has to install the MUMPS module. | +++ | | The mesh volume regions processed by each CPU core will be merged to make the volume boundaries invisible. | | Filter results | | | | | +++
On the Mystran tab you can specify the following:
+++ | Name | Description | +====================================================+==========================================================================================================================+ | | If checked, FreeCAD will look for the binary of the Mystran in known (usual) directories | | Search in known binary directories | | | | | +++ | | The path to the the binary of the Mystran | | Mystran binary path | | | | | +++
On the Z88 tab you can specify the following:
+++ | Name | Description | +====================================================+===========================================================================================================================================================================================================================+ | | If checked, FreeCAD will look for the binary named z88r of the Z88 solver in known (usual) directories | | Search in known binary directories | | | | | +++ | | The path to the the binary named z88r of the Z88 solver | | z88r binary path | | | | | +++ | | The solver method used by the Z88 solver for new simulations. | | Solver method | | | | | +++ | | This is relevant when the solver method Simple Cholesky is used. After starting the solver, it might tell you that you need to increase the MAXGS value. In this case increase the max places and re-run the solver. | | Max places in stiffness matrix | | | | | +++ | | This is relevant when one of the iterative solver methods is used. After starting the solver, it might tell you that you need to increase the MAXKOI value. In this case increase the max places and re-run the solver. | | Max places in coincidence vector | | | | | +++
On the Material tab you can specify the following:
+++ | Name | Description | +===============================================================================================+=======================================================================================================================================================================================================+ | | The cards built-in to FreeCAD will be listed as available. | | Use built-in materials | | | | | +++ | \AppData\Roaming\FreeCAD\Material* | | Use materials from Materials directory in user's FreeCAD preference directory | | | | | +++ | | Also material cards also from the specified directory will be listed as available. | | Use materials from user defined directory | | | | | +++ | | Duplicate cards will be deleted from the displayed material card list. | | Delete card duplicates | | | | | +++ | | Material cards will appear sorted by their resources (locations). If unchecked, they will be sorted by their name. | | Sort by resources | | | | | +++
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