Application of point and line implicit Preconditioning Techniques to unsteady flow simulations

Kurzfassung

To improve the efficiency for unsteady flow simulations a modification of a family of preconditioners known for steady state simulations is investigated when applied to unsteady flow simulations. The modification applied to specific – namely point and line implicit preconditioners – is implemented into an existing CFD code. For high Reynolds number turbulent flows the gain with respect to efficiency of the preconditioned methods will be demonstrated when compared with the classical solution methods, explicit Runge-Kutta with local time-stepping and matrix free LU-SGS.