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PERMAS-CAMG Contact Multigrid Analysis

Principle: coarsening and projection

The algorithms of this module provide a new generation of contact solvers in order to enable the solution of complex contact problems with extremely short runtimes. The solvers use innovative update schemes for the flexibility matrix, as well as a new contact-multigrid coarsening scheme (see picture on the left) to reduce runtime complexity.

The approach realized in PERMAS is based on a problem reduction by condensation, instead of a problem extension by the contact dofs (condensed lagrange flexibility solution). Thus, this is a true technology alternative to the mainstream approaches. See also WebConference. INTES has about 30 years of experience with this kind of technology. Further informations see Presentation.

Three generations of contact solvers

The module PERMAS-CAMG is an opportunity to further scale up the structural mechanics model size as well as the contact dofs. The resulting perfomance gain may be used to analyze model variants, or in combination with structural optimization. The module is used as an add-on to modules PERMAS-CA and CAX. It may be used with linear statics (LS), or with nonlinear statics (NLS).

Some properties:
  • Easy-to-use: No changes in dat/uci files needed.
  • Numerically equal results.
  • Significant performance improvements for contact (up to > 20).
  • See subsequent examples.

Speedup of motor simulation with gaskets and temperature dependent material data

Computation times are given as elapsed time [hh:mm]. Speedup (green) for total job and contact computation.

Application example, courtesy of PORSCHE AG

Speedup of gearbox calculation

Computation times are given as elapsed time [hh:mm]. Speedup (green) for total job and contact computation.

Gearbox calculation (model similar, courtesy of ZF Friedrichshafen AG)