Collaborators

•      Ursula Bungert
•      Guido Schröder
•      K. Heinke Schlünzen

Cooperations

•      M. Lukacova, TU Harburg
•      S. Noelle, RWTH Aachen

Funded by

     DFG, 01 Jan 2007 - 30 Jun 2007

Subject

In general, effects of small scale processes are parametrised. For investigating e.g. cyclone generation or heterogeneities in fronts small scale processes need to be resolved. This can be achieved by high-resolution simulations, which are, however, very expansive. Hybrid Methods for a direct simulation are: use on non-uniform grids, one-way-nesting, two-way-nesting and dynamical grid refinement. For these methods suitable numerical schemes, grid refinement criteria and the variables to be nested need to be determined. In addition, it is unclear, if the additional costs when using hybrid methods are lower than those for high-resolution simulations. Furthermore, it needs to be checked if the solutions are realistic. Objective of the project is to identify the best suitable method for direct simulation of small scale phenomena. The different methods will be implemented, applied to same test cases and evaluated. Numerical methods suitable for grid refinement will be introduced.

Results:

Schröder G., Schlünzen K.H., Schimmel F. (2006): Use of (weighted) essentially non-oscillating advection schemes in the mesoscale model. Quarterly Journal Roy. Met. Soc. 132, 1509-1526; DOI: 10.1256/j.04.191.