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VALidation and Improvement of Airframe Noise prediction Tools(ACP8-GA-2009-233680)

WP 4 – Improvements of Numerical CAA Approaches

Task 4.1 – Improvements of source modelling

Compiled by: M.Shur, M.Strelets (NTS)

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• Task 4.1 objectives

• Partners involved and allocated efforts

• Main directions of work (according to DoW)

• Overview of partners’ contributions

OUTLINEOUTLINE

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Task ObjectivesTask Objectives

• General WP-4 objective: Development of improved simulation approaches and enhanced algorithms for AFN prediction

Within envisioned avenues of improvements identified in VALIANT DoW

Based on the weak points of the state-of-the-art tools discovered by Partners in the course of WP3

• In particular, Task 4.1 deals with improvements in the area of

Turbulent Noise Source ModellingTurbulent Noise Source Modelling

• These include both: Approaches to turbulence simulation (Sub-Task 4.1.1) Higher order schemes (Sub-Task 4.1.2)

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Partners and Allocated EffortsPartners and Allocated Efforts

Partner1

VKI2

IMM4

TUB5

ONERA8

DLR9

CIMNE10

NTS11

NUM

P-M (total DoW) 7.0 11.5 10.0 5.5 9.0 7.5 9.0 2.0

P-M (18 months, DoW)

4.5 7.5 5.5 2.0 4.5 4.0 2.0 ?

P-M (18 months, fact)

? ? ? ? ? ? 8.0 ?

Contribution

• All “numerical teams”, except for LMS (8 Partners), are involved

• Green – ProvidedGreen – Provided• Red – Not provided Red – Not provided

• Deliverables: D21 – Intermediate report (month 21 – May 2011) D31 – Final report (month 30 – February 2012)

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Main Directions of Partners’ Work (DoW)Main Directions of Partners’ Work (DoW)• VKIVKI

Extension of steady higher order space discretization Residual Distribution Schemes developed by VKI earlier on time-dependent computations on unstructured grids, to cope with CAA problems

• IMMIMM Enhancement of in-house codes by implementation of:

- Kinetically consistent formulations of turbulence-resolving approaches (better representation of near-wall turbulence)- Higher-order approximations on unstructured grids

• TUBTUB Improvement of hybrid RANS-LES approaches implemented in in-house code

- “DDES-type” methods – reducing inaccuracies associated with the so-called “grey area” (may be important for gap turbulence interaction test case)- “WMLES-type methods” – removing minor “log-layer mismatch” predicted by the IDDES within the code

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Main Directions of Work - 2Main Directions of Work - 2• ONERAONERA

Development of improved methods of creating turbulent fluctuations at the upstream boundary of LES domain within 2-stage RANS-NLDE approach (important for wing-flap test case)

- Techniques will be based on Synthetic Eddy Method of Jarrin et al.: expected to produce more realistic turbulence since it allows to reproduce both 1st- and 2nd-order moments

• NTSNTS Work on same issue, in the framework of Embedded IDDES

- Enhancement of earlier developed turbulence-recycling procedure- Development of new efficient generator of “synthetic turbulence” at RANS-LES interface (more flexible and user-friendly than recycling)

• DLRDLR Extending of stochastic approach to noise generation to the case of mean flows supporting self-sustained large-scale oscillations (important for slat-wing and gap turbulence test cases)

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Main Directions of Work – 3 Main Directions of Work – 3 • CIMNECIMNE

Extension of SGS-modelling developed by CIMNE earlier for stabilization of the FE formulations to simulation of turbulence

• NUMECANUMECA Validation of promising techniques of acceleration of LES-based computations on broadband noise prediction problems Extension of capabilities of LEE solver for acoustic propagation based on high order Discontinuous Galerkin formulation

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OVERVIEWOVERVIEW

of Partners Contributionsof Partners Contributions

• VKIVKI• IMMIMM• TUBTUB• ONERAONERA

• DLRDLR• CIMNECIMNE• NTSNTS• NUMECANUMECA

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Summary of VKI Contribution (1/2)

“Title if applicable”, authors

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Summary of VKI Contribution (2/2)

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Summary of IMM Contribution (1/2)

“Title if applicable”, authors

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Summary of IMM Contribution (2/2)

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Summary of TUB Contribution (1/2)

“Title if applicable”, authors

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Summary of TUB Contribution (2/2)

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Summary of ONERA Contribution (1/2)

“Title if applicable”, authors

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Summary of ONERA Contribution (2/2)

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Summary of DLR Contribution (1/2)

“Title if applicable”, authors

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Summary of DLR Contribution (2/2)

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Summary of CIMNE Contribution (1/2)

“Title if applicable”, authors

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Summary of CIMNE Contribution (2/2)

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Summary of NTS Contribution (1/2)

“Title if applicable”, authors

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Summary of NTS Contribution (2/2)

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Summary of NUMECA Contribution (1/2)

“Title if applicable”, authors

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Summary of NUMECA Contribution (2/2)

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Concluding RemarksConcluding Remarks