Flow Stability Techniques.

Flow stability techniques predict how small flow perturbations grow or decay with respect to a stable flow solution, providing valuable information about how the transition to unsteadiness appears and the means that help to control it.

To achieve its technological impact the following technical objectives are considered

1Development of new numerical methods and tools better suited for stability analysis and direct numerical simulation, capable of capturing the growth of small perturbations in the flow.

2Combination of the main theoretical/numerical capabilities developed by academics, with the state-of-the-art Computational Fluid Dynamics (CFD) capabilities available to the industrial partners in order to improve understanding of unsteady flows, flow control devices and flow instability.

3Identification of quantified aerodynamic benefits in terms of drag reduction, lifting surface size reduction (weight and fuel consumption reduction), aircraft operational maneuvers (stall conditions), noise emissions (Green Air Transport Operations) and aircraft operational safety (tail buffet alleviation).

4Investigation of control/ suppression of unsteady flow through flow control devices or surface modifications, by identifying the most suitable zones which have most influence on the flow features.

5Multidisciplinary evaluation of the most promising applications; assessment of technical feasibility; potential of control devices for flow instability suppression or delay.

6To extend stability analysis and the mathematical foundation to other research areas, not only aeronautics.

Industry will acquire from this project awareness of new potential technologies, as well as new capabilities to be implemented within the design process. Direct impact is expected on the analysis of unstable/unsteady flows such as: flow separation/high-lift configurations (by introducing new techniques that provide insight about the stability of a given design), transition prediction (early simulation capabilities based on current technologies in use), flow control (by providing information of the areas where flow control devices are more efficient), novel simulation techniques (which will reduce the design loop cost by reduction of resources needed to perform the same simulation) and solution quality increases (by improving current numerical methods in regions where accuracy is a must).


Universidad Politecnica de Madrid Imperial College London Katholieke Universiteit Leuven University of Cambridge Office National d'Etudes et de Recherches Aerospatiales Deutsches Zentrum für Luft– und Raumfahrt Von Karman Institute Numerical Mechanics Applications Airbus Operations KTH