IMFT Partnerwise presentation Contributors: M. Braza*, F.Grossi*, M. - - PowerPoint PPT Presentation

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IMFT Partnerwise presentation Contributors: M. Braza*, F.Grossi*, M. - - PowerPoint PPT Presentation

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ECINADS Mid-Term Meeting -Paris, 10 Mai 2011 IMFT Partnerwise presentation Contributors: M. Braza*, F.Grossi*, M. Gual Skopek**, H. Ouvrard* ,1 Collaboration externe: Y. Hoarau*** Institut de Mcanique des Fluides de Toulouse - UMR CNRS

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

IMFT Partnerwise presentation

Contributors: M. Braza*, F.Grossi*, M. Gual Skopek**, H. Ouvrard*,1

Collaboration externe: Y. Hoarau***

Institut de Mécanique des Fluides de Toulouse - UMR CNRS N°5502

*IMFT

**IMFT-TUB

1 Presently at CINES

***IMFT-IRIT-IMFS

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

  • Task 3.2 Preconditionning aspects linked to advanced

statistical (URANS) and Hybrid (DES) Turbulence Modelling

  • OES – organised Eddy Simulation – Statistical approach

able to capture coherent features Highly detached unsteady flows around bodies, High – Reynolds

  • Anisotropic reinforcement of OES : The tensorial Eddy-Viscosity

concept for non-equilibrium turbulence

  • Implementation in the NSMB – Navier-Stokes MultiBlock code
  • f the tensorial eddy-viscoosity modelling as well as of DRSM
  • Study of robustness and convergence for high and for low Mach

number applications

Contribution of IMFT

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

  • URANS : Spalart – Almaras (SA), k-ε, k-ω -BSL, k-ω -SST
  • OES standard (e.g. Boussinesq based) and anisotropic (tensorial νt

derived from DRSM), OES-k-ω, OES-k-ε, OES-DRSM (implemented)

  • Hybrid Turbulence modelling:

Delayed Detached Eddy Simulation, DDES using:

  • SA, k-w SST in the RANS part,
  • Improved DDES using OES k-ω in the RANS part: DES-OES
  • DES-A-OES : using the tensorial Eddy-Viscosity

concept in the RANS part

  • Current developments:
  • OES with upscale turbulence modelling using stochastic forcing

(Deri, Braza, Hunt, Ouvrard, ETC13 – European Turbulence Conference)

Capturing of thin shear layer turbulent/non-turbulent interfaces Inverse cascade

Turbulence modelling approaches used in ECINADS Turbulence modelling approaches used in ECINADS

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

  • OAT15A : Transonic buffet over a supercritical airfoil
  • High-Re subsonic turbulent flow around a tandem cylinder:

calculation of predominant frequencies for aeroacoustics of landing gear generic configuration

  • High-Re subsonic strongly detached turbulent flow around

a rectangular plate in incidence of 14°

  • The ‘IMFT’s circular cylinder test-case, Re=140,000
  • Current developments for advanced turbulence modelling assessment

for capturing aeroelastic flutter around the AGARD wing 445.6

Test-Cases running: Test-Cases running:

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

Representative Results Representative Results

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

The tandem Cylinders The tandem Cylinders

  • Exp. results at NASA-Langley, Jenkins et al, AIAA J. 2010 Re=1,6 x 10
  • Exp. results at NASA-Langley, Jenkins et al, AIAA J. 2010 Re=1,6 x 105

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  • Capturing of the shear layer dynamics

and of pressure fluctuations responsible for aerodynamic noise during landing phase

  • Capturing of the predominant frequencies and amplitudes
  • Assessment of the predictive abilities of turbulence

modelling (statistical and hybrid, standard and improved) for capturing of thin shear layer dynamics

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

ST11 – Tandem Cylinder ST11 – Tandem Cylinder

PIV DDES k-ω -OES

Aerodays March 2011, M. Gual-Skopek

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

  • thin separated shear-

layer dynamics capturing

  • turbulence wraps

around 2nd cylinder

ST11 – Tandem Cylinder ST11 – Tandem Cylinder

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

Time-averaged results Time-averaged results

cp-curves

  • 1st cylinder
  • 2nd cylinder

Velocity profiles

  • Gap region
  • Rear flow
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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

ST11 – Iso-velocity profiles ST11 – Iso-velocity profiles

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

The OAT15A The OAT15A

  • Exp. results by Jacquin et al, ONERA Meudon, AIAA J. 2009, 2010
  • Exp. results by Jacquin et al, ONERA Meudon, AIAA J. 2009, 2010
  • Capturing of the natural unsteadiness of the buffet

phenomenon arising at Mach number (0.7-0.8)

  • Study of the shock-vortex interaction with the von Karman

mode in the wake

  • Assessment of the predictive abilities of turbulence

modelling (statistical and hybrid, standard and improved) for buffet and shock-vortex interaction capturing 3D computaitons under way

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

IMFT

  • Grid test

2D unsteady simulations using the SA model

M1: ONERA Grid: ≈ 110 000 cells in 2D 41 cells in 3D, s=0.246c M2: IMFT Grid: ≈ 131 000 cells in 2D 64 cells in 3D, s=0.246c, 8,3 M points

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For URANS: grid-independence. For hybrid modelling: suggested grid M2

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

IMFT

Longitudinal velocity rms fields EXP

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

IMFT

– Amplitude is over-predicted by the SA model – Unsteady behavior well reproduced by the k-ε OES. The model captures the secondary oscillations as in the experimental data. – All models show a bump in the high-frequencies corresponding to the von Kármán mode (≈ 30-40 times the buffet frequency)

Time-evolution of surface pressure at X/c = 0.45 Pressure power spectra at X/c = 0.45

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Fbuffet_exp=69 Hz

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

ST06 : Transonic buffet ST06 : Transonic buffet

  • ver a supercritical airfoil – OAT15A
  • ver a supercritical airfoil – OAT15A

k-ε-OES

Iso- div ( V ): illustration of SWBLI and shock-vortex (Von Karman) interaction Iso- div ( V ): illustration of SWBLI and shock-vortex (Von Karman) interaction

  • F. Grossi
  • A. Sevrain
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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

Flat plate (‘strut’) Test-case, Re=200,000 Flat plate (‘strut’) Test-case, Re=200,000 and 400,000 and 400,000

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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011

Conclusions and Outlook Conclusions and Outlook

  • Reinforcement of robustness for OES with tensorial eddy-viscosity

modelling

  • Optimum preconditionning for unsteady low Mach flows
  • Reinforcement of robustness for the DRSM
  • Assessment of Turbulence Modelling abilities with the numerics

improvements for capturing of the aeroelastic flutter – AGARD 445.6

  • Use of adjoints evaluation provided by INRIA for shape optimisation
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ECINADS –Mid-Term Meeting -Paris, 10 Mai 2011