Christian Bartels Daniel Gerlach Abstract Turbulence is certainly the most important unsolved problem in fluid mechanics. The motivation for this choice is that a simple geometry is best suited for a fundamental study of turbulence. 590 has been reached up to now. Thus for the first time a turbulent channel will be simulated with a layer of appreciable thickness where the logarithmic law applies. The complex geometry of a stirred vessel was chosen to demonstrate the applicability of DNS to real-world problems.
Stirred vessels are an important part of production lines in chemical engineering.
However, for lower Reynolds numbers, where turbulence is not fully developed, turbulence models fail to predict correct results. Unfortunately, this Re-number range is of practical relevance. The aim of this proposal is to demonstrate that DNS is able to provide accurate and detailed data about the transitional flow field and turbulent quantities even in complex geometries.