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Efficient Turbulence Models for Aeronautics

Objective

This Focused Fundamental Research project addresses the development of "Numerical Turbulence Models" through well coordinated efforts on both the physical modelling and numerical methods in order to significantly improve predictions in aeronautical applications. Research groups in this area with extensive and notable achievements in computations, and physical modelling and state-of-the-art experimental facilities will work together toward this common goal.

The objectives of the project are:

- To develop and extend second-order turbulence closure models for incompressible flows.
- To develop and extend numerical models for simulating compressible shear, boundary, and shock layer interactions in both steady and unsteady flows.

Analytical Studies

- To improve and extend the e-equation in the k-e model so as to account for mean flow vorticity, anisotropy, multiple-wall proximity, and low Reynolds number effects.
- To further refine a new length-scale equation based on two-point correlations.
- To re-examine and start the development of new models for the pressure-strain and turbulent transport terms in the Reynolds-stress equations based on two-point correlations.
- To perform numerical studies that make direct use of the analytical developments.

The developments of the second and third items are based on two-point correlation techniques. This approach to turbulence modelling is physically sound and mathematically rigorous.

Experimental Studies

State-of-the-art experimental techniques (PIV, optical skin friction sensors using fibre optics, flow-visualization coupled with image processing, multiple hot-wire probes, and LDA) will be used in the following studies:

- Two-point correlations of the Reynolds-stress tensor in channel and round free jet flows.
- Three-dimensional boundary layers.
- Internal and external separated flows.

Numerical Studies

These studies will focus on numerical methods and turbulence models for compressible flows, especially on predicting the interactions between shear layers, boundary layers, and shocks. The main objective is to produce the following enhancements on existing predictive methods:

- Modelling improvements (introduce new terms to account for unsteady flow features, pressure gradient, and anisotropy).
- Accuracy of approximations (improve near-wall special treatments, non-structured meshes).
- Efficiency of solution algorithms (implicit algorithms, multigrid).

Concerning the cooperation in this "concerted action", the keywords are: "a common CFD library" and "an electronic network". In more detail, the cooperation will rely on a database consisting of a CFD software FORTRAN library with the associated documentation and the numerical (meshes, solutions) and experimental data that will be available by electronic network to a progressively larger number of academic institutions (for research or training purposes) and industry.

Fields of science

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Call for proposal

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Funding Scheme

CSC - Cost-sharing contracts

Coordinator

INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE - INRIA
EU contribution
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Address
Route des Lucioles 2004
06902 SOPHIA ANTIPOLIS
France

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Total cost
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Participants (19)

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Last update: 18 December 1995

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Permalink: https://cordis.europa.eu/project/id/AER20051

European Union, 2024