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Investigation of the flow dynamics in a channel constricted by periodic hills

Communication avec acte
Auteur
CINNELLA, Paola
ccGLOERFELT, Xavier
694 Laboratoire de Mecanique des Fluides et d'Acoustique [LMFA]
134975 Laboratoire de Dynamique des Fluides [DynFluid]

URI
http://hdl.handle.net/10985/15319
DOI
10.2514/6.2015-2480
Date
2015

Résumé

The present study aims at getting better insight of the complex flow dynamics in a channel constricted by periodic hills. This is a popular test case ofer used to assess LES and RANS/LES models, which appears as a compendium of flow separation and reattachment from a curved boundary, generation of an unsteady shear layer surrounding the recirculation bubble, strong acceleration on the convex windward wall of the next hill, attached boundary layer on the ceiling subject to intense instantaneous pressure gradients, recycling of the turbulence due to the periodicity assumption. One unresolved issue which is addressed in the present work concerns the early birth of the shear layer and the rapid eruption of large scales, with a characteristic length-scale many times greater than the thickness of the initial shear. The mechanism leading to large vortices in the shear layer indeed bears similarities with the collective interaction phenomenon, which has been encountered for mixing layer excited by a low-frequency component. The present results are a first attempt to characterize this complex process highly disrupted by the turbulent fluctuations turning into the periodic box.

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  • Dynamique des Fluides (DynFluid)

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    Article dans une revue avec comité de lecture
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    A novel Sparse Bayesian Learning (SBL) framework is introduced for generating parsimonious stochastic algebraic stress closures for the Reynolds-Averaged Navier–Stokes (RANS) equations from high-fidelity data. The models ...
  • Numerical Investigation of High‑Speed Turbulent Boundary Layers of Dense Gases 
    Article dans une revue avec comité de lecture
    PASSIATORE, Donatella; CINNELLA, Paola; GRASSO, Francesco; ccSCIACOVELLI, Luca; ccGLOERFELT, Xavier (Springer, 2020-03)
    High-speed turbulent boundary layers of a dense gas (PP11) and a perfect gas (air) over flat plates are investigated by means of direct numerical simulations and large eddy simulations. The thermodynamic conditions of the ...
  • Investigation of high-order methods in large-eddy simulation of separated flow in a channel with periodic constrictions 
    Chapitre d'ouvrage scientifique
    CINNELLA, Paola; ccGLOERFELT, Xavier (Springer, 2018)
    In large-eddy simulations (LES), only the dynamics of large scales is computed and the effect of smaller scales is modelled. Scale separation is however difficult to establish since the low-pass filtering arises from a ...
  • DNS of turbulent flows of dense gases 
    Article dans une revue avec comité de lecture
    ccSCIACOVELLI, Luca; ccCINNELLA, Paola; ccGLOERFELT, Xavier; GRASSO, Francesco (IOP Publishing, 2017-04)
    The influence of dense gas effects on compressible turbulence is investigated by means of numerical simulations of the decay of compressible homogeneous isotropic turbulence (CHIT) and of supersonic turbulent flows through ...
  • Numerical Investigation of Supersonic Dense-Gas Boundary Layers 
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    ccSCIACOVELLI, Luca; ccPASSIATORE, Donatella; ccGLOERFELT, Xavier; ccCINNELLA, Paola; GRASSO, Francesco (Springer International Publishing, 2020-07)
    A study of dense-gas effects on the laminar, transitional and turbulent characteristics of boundary layer flows is conducted. The laminar similarity solution shows that temperature variations are small due to the high ...

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