Introducing UHURA Project

The project UHURA is focusing on the unsteady flow behavior around high-lift systems.

It will for the first time deliver a deeper understanding of critical flow features at new types of high-lift devices for transport aircraft during their deployment and retraction together with a validated numerical procedure for their simulation.


Krueger flaps are leading edge high-lift devices that enable laminar flow wing technology. From previous experiences, the suitability of the leading edge device is known for at least the steady flow of the fully deflected device.

Nevertheless the unsteady flow behaviour of such kind of device during deployment has not yet been investigated. UHURA aims to close this gap for the full deflection and retraction process.

UHURA is an EC-funded project in the framework of Horizon 2020. It is a follow-on of DeSiReH (2009-2013), where the type of leading edge device has been established, and the 7th Framework project AFLoNext (2015-2018), where it has been further matured.


UHURA aims to validate numeric simulation capabilities for the unsteady flow around high-lift systems during their deployment and retraction.

UHURA performs detailed experimental measurements in several wind tunnels to obtain a unique data set for validation purposes of Computational Fluid Dynamics (CFD) software, including detailed flow measurements by Particle Image Velocimetry (PIV) and other optical measurement technologies.

Advanced CFD methods promising significant improvements in the design lead time are validated against this database to obtain efficient and reliable prediction methods for the design phase.


Date Topic

The ONERA has prepared a very informative video of the Wind-Tunnel test campaign performed within UHURA in WP3 in 2021.


The UHURA-Consortium will organise a session on the 9th European Congress on Computational Methods in Applied Science and Engineering (ECCOMAS 2022) on the 5th-9th of June 2022. Details to this session can be found here.
The following papers and speakers are foreseen:

  • A Validation Program for Dynamic High-Lift System Aerodynamics, Jochen Wild, Henning Strüber, Frédéric Moens, Bart v. Rooijen & Hans Maseland
  • Krueger High-Lift System Design Optimization, Emiliano Iuliano, Domenico Quagliarella & Jochen Wild
  • Lessons Learnt from Chimera Method Application to a Deploying Krueger Device, Apurva Hasabnis, Hans Maseland, Frédéric Moens, Aleš Prachař & Jochen Wild
  • Scale-resolved simulations of the deployment and retraction of a Krueger high-lift device, Stefan Wallin, Matteo Montecchia, Peter Eliasson & Aleš Prachař
  • Lattice Boltzmann simulation of a deploying Krueger device, Jorge Ponsin & Carlos Lozano

April 2022

DLR-F15-LLE Model with Krüger flap mounted in open test section of DNW-LLF wind tunnel; group image at the end of the PIV test campaign April 2022