Geodesic
Numerical simulations of a swirling flow in a francis draft tube
Sibirskij žurnal industrialʹnoj matematiki, Tome 26 (2023) no. 1, pp. 132-141

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We study the flow in a model Francis-99 draft tube for partial load conditions using Large-eddy simulations. The swirl is produced by the runner rotating with a constant angular velocity. Within the validation step we compare results of eddy-resolving simulations with our Particle image velocimetry (PIV) and pressure measurements for three flow cases with different incoming flow rates. The time-averaged velocity fields agree well in experiments and simulations. To study the dynamical features we analyze spectral characteristics of the flow featuring a strong coherent component. This vortical structure corresponds to the precessing vortex core (PVC) changing the shape and amplitude with the increase in the bulk velocity.
Keywords: hydroturbine, draft tube, swirling flows, hydrodynamics instability, self-oscillation, precessing vortex core, large-eddy simulation.
Mots-clés : turbulence, simulation 
@article{SJIM_2023_26_1_a11,
     author = {E. V. Palkin and M. Yu. Hrebtov and R. I. Mullyadzhanov and I. V. Litvinov and S. V. Alexeenko},
     title = {Numerical simulations of a swirling flow in a francis draft tube},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {132--141},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2023_26_1_a11/}
}
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E. V. Palkin; M. Yu. Hrebtov; R. I. Mullyadzhanov; I. V. Litvinov; S. V. Alexeenko. Numerical simulations of a swirling flow in a francis draft tube. Sibirskij žurnal industrialʹnoj matematiki, Tome 26 (2023) no. 1, pp. 132-141. http://geodesic.mathdoc.fr/item/SJIM_2023_26_1_a11/