Simulation of Vortex Instabilities in Turbomachinery

Albert Ruprecht ()
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Albert Ruprecht: University of Stuttgart, Institute of Fluid Mechanics and Hydraulic Machinery

A chapter in High Performance Computing on Vector Systems, 2006, pp 155-169 from Springer

Abstract: Abstract The simulation of vortex instabilities require a sophisticated modelling of turbulence. In this paper a new turbulence model for Very Large Eddy Simulation is presented. Its main characteristic is an adaptive filtering technique which can distinguish between numerically resolved and unresolved parts of the flow. This unresolved part is then modelled with extended k — ɛ model of Chen and Kim. VLES is applied to the simulation of vortex instabilities in water turbines. As a first example the unsteady vortex flows in draft tube is shown and in a second application the unstable flow in a pipe trifurcation is calculated. These cases cannot be predicted accurately with classical turbulence models. Using the new technique, these complex phenomena are well predicted.

Keywords: Turbulence Model; Large Eddy Simulation; Draft Tube; Turbulence Spectrum; Detach Eddy Simulation (search for similar items in EconPapers)
Date: 2006
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-540-35074-3_11

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DOI: 10.1007/3-540-35074-8_11

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