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FEMAC- Finite Elements Matlab Code

Provides core Finite Elements functionality that other projects can be built upon.

Features

Current

  • Structural Mechanics formulation
  • St. Venant Kirchoff material implemented
  • Quad4 and Tri3 Elements supported, but further elements can be easily added
  • Linear elasticity
  • GMSH Input
  • VTK Output
  • Full simulation- pre- and postprocessing-control via .dat-file
  • Arbitrary Dirichlet and Neumann Conditions possible(e.g. line conditions)
  • File Selection via GUI
  • L2-Error calculator
  • Separation of pre-processing, main calculation and post-processing
  • FETI
    • Solvers
      • FETI2
      • FETIS
    • Features
      • combined and single-substructure output
      • output of iteration steps possible

Planned

  • Support for dynamic problems
  • Non-linear formulation
  • Non-conforming meshes
  • MPCG for FETI

Examples

Basic Example

A very basic exapmple is provided in

$ >> ./examples/core/inmanual_outmatlab.m

It gives insight into the internam geometry representation and condition specification. Elements and Conditions are created and managed manually.

Other Examples

Further, full-featured examples are provided in the ./examples folder

Usage

The repository provides 4 basic routines:

  • femac_pre.m
  • femac_main.m
  • femac_post.m
  • femac.m

femac_pre.m

Reads the mesh-file, generates all Discretization object and writes the results to the .dis-file in binary format.

$ >> femac_pre(<dat-file path>)

femac_main.m

Starts the calculation from a pre-genearated binary .dis-file. When the primary solution has been obtained, the results are written to the .res-file

$ >> femac_main(<dat-file path>)

femac_post.m

Starts the calculation from a pre-genearated binary .res-file. When the primary solution has been read from the file, the post-processing is started.

$ >> femac_post(<dat-file path>)

femac.m

Starts the calculation directly from the .msh-file. Basically calls femac_pre.m, femac_main.m and femac_post.m subsequently on the same .dat-file.

$ >> femac(<dat-file path>)

If the user provides no arguments, a GUI-window opens in order to select a .dat-file see ./examples/core/patchtest.m for a full-featured dat-file. Have a look into ./examples for valid .dat-files

Version

0.9