Abstract
The use of hybrid grids in Computational Fluid Dynamics for the simulation of viscous flows around complex geometries has become increasingly important in recent years. Though this approach offers many advantages, there are a few aspects in which hybrid schemes seem to have drawbacks compared to structured codes. The first point in this respect is related to the accuracy that can be achieved in resolving viscous dominated flow regions such as boundary layers. A second point is the computational efficiency in terms of memory requirements, convergence and floating point operations per time unit of hybrid unstructured schemes. This chapter describes a computational scheme for the simulation of viscous flows around complex geometries on hybrid grids. The scheme employs the dual grid method. Computational efficiency is increased by the utilization of a multigrid algorithm and a memory optimized data structure adapted to the architecture of modern vector computers, the flow calculation are parallelized based on domain decomposition. In order to assess the accuracy of solutions obtained on hybrid grids, comparisons between the hybrid code and a validated structured scheme are presented.
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