Getting started > Understanding the Simulation, FEM, and idealized part file structure
FEM file
The FEM (.fem) file has the following characteristics:
It is not an assembly and contains no components.
It is the master model for the Simulation file. You can reuse a single component FEM file as the master model for multiple Simulation files.
It contains nodes, elements, and physical and material property tables.
It may be associative or non-associative. Associative FEM files contain CAD-derived polygon geometry for meshing.
An associative FEM file in the Simulation Navigator
The same FEM file in the Assembly Navigator
Learn more
CAE model files
Simulation file
Associative and non-associative FEM files
Idealized part file
Assembly FEM file
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FEM file, Simcenter 3D 2021.1 Series
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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id967838 · retrieved 2026-07-17