High-fidelity simulations of unsteady civil aircraft aerodynamics: stakes and perspectives. Application of zonal detached eddy simulation

Deck, Sébastien; Gand, Fabien; Brunet, Vincent; Khelil, Saloua Ben

doi:10.1098/rsta.2013.0325

Cited by 60 publications

(43 citation statements)

References 46 publications

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“…Even the most advanced large eddy simulation (LES) and RANS/LES approaches are still not mature enough for this type of flow driven by the dynamics of converging turbulent boundary layers in corners [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Corner Flow Separation on a Simplified Junction

et al. 2015

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This study focuses on the corner flow separation occurring in a simplified wing-body junction composed of a NACA0015 twisted wing mounted on a flat plate at a Reynolds number based on the wing chord of Re c 1.2 × 10 6 . Wind-tunnel test measurements are carried out in the corner area including extensive oil-flow visualizations, high speed particle image velocimetry and unsteady pressure sensors. The analysis of the experimental database shows that the corner flow separation creates mean flow distortions that induce high anisotropy in the Reynolds stresses and turbulent kinetic energy. The wall pressure spectra show a broadband hump associated with the corner flow separation at St δ 0.04, based on the incoming boundary layer thickness. A sensitivity study indicates the progressive growth of the corner flow separation with increasing angle of attack, leading to complete wing stall and the delay of the corner flow separation onset when the incoming boundary layer is thicker.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Corner Flow Separation on a Simplified Junction

et al. 2015

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“…Deck et al [12] present a range of exciting cutting-edge examples showing the application of hybrid RANS-NDS to various airframe-related flows. The zones where RANS and NDS are used, and the local modelling methodologies are solidly rationally based.…”

Section: Airframesmentioning

confidence: 99%

Aerodynamics, computers and the environment

Tucker

DeBonis

2014

Phil. Trans. R. Soc. A.

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“…Seamless DES is very efficient in external flows with massive separations [20], whereas its effective application to complex internal flows needs a significant number of adaptations and improvements compared to the baseline formulation shown above. In such cases, a somewhat simpler alternative is represented by the "zonal-DES" (ZDES) approach [29][30][31], in which different parts of the computational domain are marked a priori by the user as URANS, LES or DES. Our zonal rearrangement of the F DES function consists of:…”

Section: Derivation Of the Zonal-des Formmentioning

confidence: 99%

A Modified Version of the RNG k–ε Turbulence Model for the Scale-Resolving Simulation of Internal Combustion Engines

2017

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Abstract:The unsteady and random character of turbulent flow motion is a key aspect of the multidimensional modeling of internal combustion engines (ICEs). A typical example can be found in the prediction of the cycle-to-cycle variability (CCV) in modern, highly downsized gasoline direct injection (GDI) engines, which strongly depends on the accurate simulation of turbulent in-cylinder flow structures. The current standard for turbulence modeling in ICEs is still represented by the unsteady form of Reynold-averaged Navier Stokes equations (URANS), which allows the simulation of full engine cycles at relatively low computational costs. URANS-based methods, however, are only able to return a statistical description of turbulence, as the effects of all scales of motion are entirely modeled. Therefore, during the last decade, scale-resolving methods such as large eddy simulation (LES) or hybrid URANS/LES approaches are gaining increasing attention among the engine-modeling community. In the present paper, we propose a scale-resolving capable modification of the popular RNG k-ε URANS model. The modification is based on a detached-eddy simulation (DES) framework and allows one to explicitly set the behavior (URANS, DES or LES) of the model in different zones of the computational domain. The resulting zonal formulation has been tested on two reference test cases, comparing the numerical predictions with the available experimental data sets and with previous computational studies. Overall, the scale-resolved part of the computed flow has been found to be consistent with the expected flow physics, thus confirming the validity of the proposed simulation methodology.

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High-fidelity simulations of unsteady civil aircraft aerodynamics: stakes and perspectives. Application of zonal detached eddy simulation

Cited by 60 publications

References 46 publications

Experimental Study of the Corner Flow Separation on a Simplified Junction

Experimental Study of the Corner Flow Separation on a Simplified Junction

Aerodynamics, computers and the environment

A Modified Version of the RNG k–ε Turbulence Model for the Scale-Resolving Simulation of Internal Combustion Engines

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