Recent developments in the UHURA project: Unsteady High-Lift Aerodynamics - Unsteady RANS Validation
Time: Thu 2021-04-15 10.30 - 11.30
Location: FLOW eSeminar (Zoom)
Participating: Matteo Montecchia (KTH)
Abstract. High-lift devices of aircraft that increase the lift produced by the wing can reduce the speed and distance required for a safe take-off and landing and allow the use of a more efficient wing in the cruising phase of flight. The introduction of a Krüger flap enables the use of laminar wings for reduced environmental impact. The project UHURA investigates the unsteady flow behaviour around such Krüger flap during the deployment and retraction to gain an advanced understanding of critical aerodynamic features. One of the main goals of the project is to develop an accelerated CFD method that can accurately capture both the slow dynamics of mechanical components and the rapid turbulence scales. Within this frame, scripted meshing, moving/deforming mesh and different URANS and hybrid RANS/LES models have been considered.
For the transient turbulence modelling, the Delayed Detached Eddy Simulation (DDES) with the multigrid method and line-implicit acceleration has been proved to have a promising capability to maintain the prediction accuracy and computational time efficiency.
In this presentation the latest developments in the UHURA project will be illustrated.
The performances achieved with the use of a laminar wing and Krüger flap will be initially evaluated by looking at results from 2-D and 3-D RANS simulations, at different deployment angles and different angles of attack. Later on, results from unsteady simulations of Krüger flap full retraction and deployment by means of URANS and DDES will be shown with a particular focus on dynamical effects.