MOREMBS is a software package which serves as preprocessor for the order reduction of elastic bodies. The C++ implementation Morembs++ is able to handle the reduction of very large models, as they appear in industrial FEM modelling. Different to MatMorembs, powerful and specialized numeric libraries are utilized.
A major issue is buildung the inverse of large sparse matrices which is done by solving a large sparse system of equations. The implemented LU-decomposition requires a large amount of memory.
Since industrial FEM models can consist of several millions of degrees of freedom, the main border for Morembs++ is the amount of RAM available to allocate data. Therefore, numeric libraries with out-of-core solvers are implemented (MUMPS). This way, a part of the data can be written to a hard disk drive and very large systems can be handled. Another possibility to bypass the problem of not having enough memory is using the capacities at the Höchstleistungsrechenzentrum Stuttgart. Both methods allow to reduce industrial FEM models with serveral million degrees of freedom.
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