Solver Coupling with Algebraic Constraints: An Index-2 Co- Simulation Approach

Abstract eng:
A co-simulation method on index-2 level is presented and analyzed with respect to numerical stability and convergence behavior. Therefore, two arbitrary mechanical subsystems are considered, which are coupled by algebraic constraint equations (i.e. by rigid joints). In this work, we act on the assumption that each subsystem has its own solver, which integrates independently from the other subsystem solver. A weak coupling approach is used for coupling the two subsystem solvers. The coupling method analyzed here is based on the well-known stabilized index-2 formulation for multibody systems (GGL-formulation). The presented coupling technique is semi-implicit and based on a predictor/corrector approach.

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