A dynamic forcing method for unsteady turbulent inflow conditions

Laraufie, Romain; Deck, Sébastien; Sagaut, Pierre

doi:10.1016/j.jcp.2011.08.012

Cited by 57 publications

(52 citation statements)

References 31 publications

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“…The turbulence reactivation process, retained for RANS to WMLES transitions, is based on work done by Laraufie, Deck & Sagaut (2011. These authors showed that the salient combination of a simple white noise with a dynamic forcing method, referred to as LDS forcing in this paper, makes possible to recover a self-sustainable well-behaved turbulent boundary layer on a short distance.…”

Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 97%

“…In addition, the inflow boundary condition poses a particular problem not encountered in a full-scale aerofoil simulation since the mean velocity profiles are affected by the presence of a circulation associated with the lifting surface. Furthermore, as this method does not require any homogeneous direction, its application on three-dimensional complex configurations is possible quite easily and Laraufie et al (2011) demonstrated that no spurious mark is left within the aerodynamic flow field downstream the LDS forcing application region.…”

Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 99%

“…However, Laraufie et al (2011) showed that, despite the relevance of the stimulation through body forces strategy, the original source term definition fails in a WMLES context. The lag between a turbulent event and the forcing system reaction, also observed by when using a similar approach for a different purpose, was identified as the main problem.…”

Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 99%

“…The lag between a turbulent event and the forcing system reaction, also observed by when using a similar approach for a different purpose, was identified as the main problem. This led to the introduction of a new source term (Laraufie et al 2011) which permits to minimize this transition distance. Furthermore, while LDS forcing was first combined with an advanced synthetic turbulence generation inflow condition, its aptitude to lead a simple white noise to a self-sustainable well-behaved boundary layer was recently assessed by Laraufie et al (2012).…”

Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 99%

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Numerical investigation of the flow dynamics past a three-element aerofoil

2013

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A numerical investigation of the flow dynamics around a two-dimensional high-lift configuration was carried out by means of a zonal detached eddy simulation (ZDES) technique for flow conditions corresponding to aircraft approach. Both slat and flap regions have been scrutinized and compared with experimental data available in the literature. It is shown that slat and flap coves behave like shallow cavities. The distance between the upstream cusp and the downstream edge is the relevant length scale for each cove taken separately. Consistently with previous findings, this study indicates that the maximum of the broadband spectrum of slat (respectively flap) pressure fluctuations occurs for Strouhal numbers 0.5 St 4 when based on slat chord (respectively on flap chord) and free-stream velocity. It is shown that mode (n) of the slat cove and mode (n + 1) of the flap cove are very close making a coherent phase relationship possible. A large-scale coupled self-sustained oscillations mechanism between slat and flap cavities, evidenced by spectral analysis, occurs at a Strouhal number St = 3-6 based on the main wing chord and free-stream velocity. This yields to an acoustic feedback mechanism characterized by a normalized frequency depending on the free stream Mach number like St = (1 − M 2 0 )/2M 0 . The present result appears to line up with the findings by Hein et al. (J. Fluid Mech., vol. 582, 2007, pp. 179-202) who showed that two types of resonance could exist: surface waves ones, scaling with the total aerofoil length and longitudinal cavity-type resonances, scaling with the slat cove length.

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Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 97%

Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 99%

Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 99%

Section: Near-wall Turbulence Reactivation Process For Rans To Wmles mentioning

confidence: 99%

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Numerical investigation of the flow dynamics past a three-element aerofoil

2013

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“…The method proved advantages for flows characterised by strongly developing turbulence inherited from upstream boundary layers. ZDES differs from Spalart's DES through the definition of a ZDES length scale, sub-grid scale length and treatment of the near wall function in LES mode [50]. Improved formulations of ZDES were later released again by Deck [24,26].…”

Section: Zonal Rans-lesmentioning

confidence: 99%

A Review of Embedded Large Eddy Simulation for Internal Flows

Holgate

Skillen

Craft

et al. 2018

Arch Computat Methods Eng

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When scale-resolving simulation approaches are employed for the simulation of turbulent flow, computational cost can often be prohibitive. This is particularly true for internal wall-bounded flows, including flows of industrial relevances which may involve both high Reynolds number and geometrical complexity. Modelling the turbulence induced stresses (at all scales) has proven to lack requisite accuracy in many situations. In this work we review a promising family of approaches which aim to find a compromise between cost and accuracy; hybrid RANS-LES methods. We place particular emphasis on the emergence of embedded large eddy simulation. These approaches are summarised and key features relevant to internal flows are highlighted. A thorough review of the application of these methods to internal flows is given, where hybrid approaches have been shown to offer significant benefits to industrial CFD (relative to an empirical broadband modelling of turbulence). This paper concludes by providing a cost-analysis and a discussion about the emerging novel use-modalities for hybrid RANS-LES methods in industrial CFD, such as automated embedded simulation and multi-dimensional coupling.

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A Rapid and Low Noise RANS-to-WMLES Condition in Curvilinear Compressible ZDES Simulations

Renard

Deck

Weiss

2019

Progress in Hybrid RANS-LES Modelling

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The rapid and low-noise strategy of Deck et al. [7] for the RANS-to-WMLES switch compatible with compressible flow solvers on curvilinear grids is presented. It can be used both as an inflow condition or as an embedded resolved turbulence injection and combines Zonal Detached Eddy Simulation, Dynamic Forcing and Zonal Immersed Boundary Conditions (for roughness elements) approaches. The relaxation length is close to 7 boundary layer thicknesses on coarse grids and the feasibility on a 3-element high-lift airfoil is demonstrated. On a flat plate, no spurious acoustic footprint of the inflow is visible in the wall pressure spectra, of which the low-frequency part is obtained. The intermittent nature of wall turbulence is captured. The hybrid RANS/LES context makes the computational effort affordable for industrial applications, e.g. aeroacoustic studies.

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A dynamic forcing method for unsteady turbulent inflow conditions

Cited by 57 publications

References 31 publications

Numerical investigation of the flow dynamics past a three-element aerofoil

Numerical investigation of the flow dynamics past a three-element aerofoil

A Review of Embedded Large Eddy Simulation for Internal Flows

A Rapid and Low Noise RANS-to-WMLES Condition in Curvilinear Compressible ZDES Simulations

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