Abstract
This paper presents the results of a joint effort by two research groups to improve the understanding and the predictability of complex turbulent flows. On one hand, the effort was made to reliably evaluate modelling errors of several popular low-Reynoldsnumber, two-equation turbulence models by making sure that all other errors in the computations were negligibly small. On the other hand, methods suitable for direct numerical simulation of turbulent flows in complex geometries have been thoroughly evaluated by performing a systematic grid and time step refinement, evaluating discretization errors, and comparing the results with established solutions of other groups for flows in simple geometries. Finally, some complex flows have been analysed using both direct numerical simulation and turbulence modelling approaches.
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