However, some changes have to be made to make the model suitable for FEM calculations. We will start with the house we modeled in the BIM modeling chapter. Detailed instructions to install these two components are provided in the FreeCAD documentation. Another piece of software, called NetGen, which is responsible for generating the subdivision mesh, is also required. However, currently only CalculiX is fully implemented. As there are several interesting open source FEM simulation applications available, the FEM Workbench allows you to choose between them. The simulation itself is done by another piece of software, that is used by FreeCAD to obtain the results. There are a number of steps: Preparing the geometry, setting its material, performing the meshing, division into smaller parts, like we did in the Preparing objects for 3D printing chapter, and finally calculating the simulation. ![]() Obtaining such simulation is done in FreeCAD with the FEM Workbench. This has several uses in the engineering and electromagnetism fields, but we will focus on one use that is already well developed in FreeCAD, which is simulating deformations in objects which are submitted to forces and weights. It is a vast mathematical subject, but in FreeCAD we can think of it as a way to calculate propagations inside a 3D object, by cutting it into small pieces, and analyzing the impact of each small piece on its neighbours.
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