Unsteady flow separation in a turbine diffuser

Duquesne, Pierre; Maciel, Yvan; Deschênes, Claire

doi:10.1007/s00348-015-2030-7

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Cited by 13 publications

(2 citation statements)

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“…The prediction of separation phenomena, therefore, is crucial for air, land and marine transport, and for energy production. In the hydropower sector, the unsteady separation of swirling boundary layers is responsible for the degradation of turbine performance (Duquesne, Maciel & Deschênes 2015). In aerodynamics, the peak efficiency is often reached close to the onset of separation, which in turns also limit peak performance.…”

Section: Introductionmentioning

confidence: 99%

Material spike formation in highly unsteady separated flows

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Material spike formation in highly unsteady separated flows

et al. 2019

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“…The prediction of separation phenomena, therefore, is crucial for air, land and marine transport, and for energy production. In the hydropower sector, the unsteady separation of swirling boundary layers is responsible for the degradation of turbines' performance (Duquesne et al, 2015). In aerodynamics, the peak efficiency is often reached close to the onset of separation which in turns also limit its performance.…”

Section: Introductionmentioning

confidence: 99%

Material spike formation in high Reynolds number flow separation

Serra,

Crouzat,

Simon

et al. 2019

Preprint

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We apply the recent frame-invariant theory of separation spike formation to complex unsteady flows including a turbulent separation bubble, an impinging jet, and flows around a freely moving cylinder and a freely rotating ellipse. We show how the theory captures the onset of material spike formation, without any assumption on the flow type (steady, periodic, unsteady) or separation type (on-or off-wall, fixed or moving boundaries). We uncover new phenomena, such as the transition from on-wall to off-wall separation, the merger of initially distinct spikes, and the presence of severe material spikes that remain hidden to previous approaches. These results unveil how an involved network of spikes arises, interacts, and merges dynamically, leading to the final ejection of particles from the wall in highly transient flow separation processes.

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