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.
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Ruprecht, A. (2006). Simulation of Vortex Instabilities in Turbomachinery. In: Resch, M., Bönisch, T., Benkert, K., Bez, W., Furui, T., Seo, Y. (eds) High Performance Computing on Vector Systems. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-35074-8_11
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DOI: https://doi.org/10.1007/3-540-35074-8_11
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-29124-4
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