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mor4fem

The software mor4fem has been developed at IMTEK. It is a command-line tool built on top of: 1. An ANSYS-supplied library to read ANSYS binary files 2. The TAUCS library for sparse linear algebra

The software mor4fem (pronounced "more for FEM") has been developed at IMTEK. ANSYS is one of the most popular engineering software packages that implements the finite element method (FEM). The FEM models are quite accurate but because of their high dimensionality, it takes too much time to run transient or harmonic simulation.

mor4fem is a command-line tool built on top of the ANSYS-supplied library to read ANSYS binary files [1] and the TAUCS library for sparse linear algebra [2]. After a model is build and meshed in ANSYS, an ordinary differential equation (ODE) system of the first- or second-order is obtained, its dimension being routinely from 10 000 to 500 000. The information from ANSYS is transferred as a file with element matrices (EMAT file) and lists for Dirichlet boundary conditions, nodal forces and output degrees of freedoms. The developed software uses these files as input and produces a reduced model by means of the block Arnoldi algorithm. The postprocessing, that is the solution of a reduced ODE system as well as computing its transfer function is performed currently in Mathematica.

mor4fem can write the original linear high-dimensional system from ANSYS in the Matrix Market format.

If you would like to use mor4fem, please contact Jan Korvink at korvink@imtek.uni-freiburg.de.

[1] Guide to interfacing with Ansys, ANSYS corporation.

[2] S. Toledo, D. Chen, V. Rotkin, TAUCS – A library of sparse linear solvers, http://www.tau.ac.il/~stoledo/taucs/.
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