Hybrid RANS/LES Simulation of Shock-Induced Separated Flow in Truncated Ideal Contour Nozzle

Goncalves, Éric; Lehnasch, B. Guillaume; Herpe, C. Julien

doi:10.1007/978-3-319-91017-8_65

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…Such unsteady simulations have been carried out in the case of planar nozzle configuration (Martelli et al 2019) or truncated ideally contoured nozzles (Deck 2009;Shams et al 2013). The first hybrid simulations of TIC nozzle flow have more recently been reported in Goncalves, Lehnasch & Herpe (2017) and then in Martelli et al (2020).…”

Section: Numerical Set-upmentioning

confidence: 99%

“…The present DDES approach is based on the Spalart-Allmaras model and is classically built by allowing the length scale in the model to be proportional to a representative scale related to the grid size far from the wall, while remaining given by the RANS model for small distances from the wall (Spalart et al 2006). Such models based on Spalart-Allmaras models are often adopted in studies of similar nozzle flow configurations and, if correctly tuned, they have already proved to lead to satisfactory results for nozzle flows (Deck 2009;Goncalves et al 2017;Martelli et al 2019). Following the present DDES approach, as detailed in the following, the shift from RANS to LES mode, far from the wall, is thus entirely controlled through the defined mesh refinement used, thus possibly requiring preliminary adjustments in order to obtain the expected flow behaviour.…”

Section: Numerical Set-upmentioning

confidence: 99%

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Jet resonance in truncated ideally contoured nozzles

et al. 2021

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Section: Numerical Set-upmentioning

confidence: 99%

Section: Numerical Set-upmentioning

confidence: 99%

Jet resonance in truncated ideally contoured nozzles

et al. 2021

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show abstract

“…In particular, the y + values in the The present DDES approach is based on Spalart-Allmaras model and is classically built by allowing the length scale in the model to be proportional to a representative scale related to the grid size far from the wall, while remaining given by the RANS model for small distances from the wall [34]. Such models based on Spalart-Allmaras models are often adopted in studies of similar nozzle flow configurations and, if correctly tuned, they have already proved to lead to satisfactory results for nozzle flows [4,14,24].…”

Section: Numerical Set-upmentioning

confidence: 99%

“…Such unsteady simulations have been carried out in the case of planar nozzle configuration [24] or truncated ideally contoured nozzles [4] [33]. The first hybrid simulations of TIC nozzle flow have more recently been reported in [14] and then in [25].…”

Section: Numerical Set-upmentioning

confidence: 99%

Jet resonance in truncated ideally contoured nozzle

Bakulu,

Lehnasch,

Jaunet

et al. 2020

Preprint

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Unsteady side-loads observed in supersonic nozzles operating in over-expanded regime are most often associated to intrinsic unsteadiness of the shock system and separation line, featuring random motions with mainly broadband lowfrequency contributions. A tonal flow behavior, rather associated to energy peaks of fluctuating wall pressure in the middle frequency range is also found to emerge for particular operating conditions in a Truncated-Ideally Contoured (TIC) nozzle. The corresponding flow field is here investigated to understand its origin and show how it modifies side-load properties. The temporal and spatial organization of wall pressure and jet velocity field are first experimentally characterized based on synchronized acquisition of both wall-pressure along rings of pressure probes located within the nozzle and high-rate time-resolved PIV velocity fields measured in a plane section crossing the jet downstream of the nozzle exit. The external jet aerodynamics and internal wall pressure field are first shown to be clearly linked, but only at this frequency peak for which a significant coherence emerges between first azimuthal mode of fluctuating wall pressure and first azimuthal mode of fluctuating external velocity field.A Delayed Detached Eddy Simulation is carried out and validated against experimental results in order to reproduce this tonal flow dynamics. The analysis of simulation data shows that the tonal flow behaviour of first azimuthal mode is indeed more largely felt within the whole flow structure where both upstream

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Impact of the convergent geometric profile on boundary layer separation in the supersonic over-expanded nozzle

et al. 2022

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This article aims to conduct a numerical investigation of phenomena induced by gas expansion in chemical propulsion nozzles. A numerical simulation of full-scale flat convergent-divergent nozzle geometry using the finite volume method on structured meshes is performed to predict the change in the convergent geometry on the boundary layer separation resulting from a shock/shock and shock/boundary layer. Two turbulence models are tested, namely, the k−ε and k−ω shear-stress transport (SST) models. Three steps are considered to achieve this work. First, 10 numerical schemes are tested to select the accurate one. The findings of the first step are used to predict the boundary layer separation in a supersonic overexpanded nozzle. The available experimental data from the NASA Langley Research Center are used to validate the results. The third step concerns investigating the impact of the convergent geometric profile on the downstream flow of the nozzle. The obtained results are analyzed and compared with the experimental data. These results show that convergent geometry may cause the formation of different shock structures and different points of flow separation and modifies several parameters of the flow and nozzle performance downstream the throat. The findings indicated that the convergent profile must be considered during the design phase when focusing on the problem of boundary layer separation in the supersonic overexpanded regime nozzles.

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Hybrid RANS/LES Simulation of Shock-Induced Separated Flow in Truncated Ideal Contour Nozzle

Cited by 3 publications

References 7 publications

Jet resonance in truncated ideally contoured nozzles

Jet resonance in truncated ideally contoured nozzles

Jet resonance in truncated ideally contoured nozzle

Impact of the convergent geometric profile on boundary layer separation in the supersonic over-expanded nozzle

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