The influence of rotor/stator interference on shockwave/boundary layer interaction is investigated by means of an implicit large-eddy simulation. To replicate actual turbomachinery conditions but at a lower cost, this work considers a transonic bump over which a shock-wave develops and interacts with the separated boundary layer. Moreover, the backpressure is set to fluctuate at a realistic reduced frequency. The analysis is focused on the coherent component of the flow and more particularly the turbulent stresses in the recirculation region. Phase-averaging is performed in order to highlight this component and the reference oscillator is based on the location of the separation point. Statistical convergence is assessed. Coherent turbulent stresses show a two-layers pattern, the upper layer being linked to the mixing layer and the inner layer developing below. The coherent component can reach up to 60% of the local mean value. Budgets show that only some production terms are significant and each of them is acting upon a specific layer of the associated coherent turbulent stress. Finally, pressure strain, responsible for the coupling between the transport equations, is also of importance
Coherent turbulent stresses in unsteady forced transonic nozzle with shock-induced separation / Goffart, Nicolas; Tartinville, Benoît; Pirozzoli, Sergio. - (2023). (Intervento presentato al convegno ASME Turbo Expo 2023 tenutosi a Boston, Massachusetts, USA) [10.1115/GT2023-101925].
Coherent turbulent stresses in unsteady forced transonic nozzle with shock-induced separation
Nicolas Goffart
Primo
Writing – Original Draft Preparation
;Sergio Pirozzoli
Ultimo
Writing – Review & Editing
2023
Abstract
The influence of rotor/stator interference on shockwave/boundary layer interaction is investigated by means of an implicit large-eddy simulation. To replicate actual turbomachinery conditions but at a lower cost, this work considers a transonic bump over which a shock-wave develops and interacts with the separated boundary layer. Moreover, the backpressure is set to fluctuate at a realistic reduced frequency. The analysis is focused on the coherent component of the flow and more particularly the turbulent stresses in the recirculation region. Phase-averaging is performed in order to highlight this component and the reference oscillator is based on the location of the separation point. Statistical convergence is assessed. Coherent turbulent stresses show a two-layers pattern, the upper layer being linked to the mixing layer and the inner layer developing below. The coherent component can reach up to 60% of the local mean value. Budgets show that only some production terms are significant and each of them is acting upon a specific layer of the associated coherent turbulent stress. Finally, pressure strain, responsible for the coupling between the transport equations, is also of importanceFile | Dimensione | Formato | |
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