The project DWLBM - Investigation of Delta Wing Time Dependent Flow Characteristics with Lattice-Boltzmann Method is carried out by the Technical University Ingolstadt Department Mechanical Engineering at the HLRS (Hochstleistungsrechenzentrum Stuttgart). It focuses on the numerical investigation on the delta wing flow under various aspects such as sweep angle variation, sharp or round leading edges, as well as high and lower Reynolds numbers with a Lattice-Boltzmann PowerFLOW solver provided by Exa. The Lattice-Boltzmann approach shows advantages in non-stationary flow phenomena, though no systematic experimental approach has been performed with delta wing flow so far. Delta wing flow is vortex dominated where primary, secondary and tertiary vortices are produced at the leading edge, interacting with each other and the wing boundary layer. At increasing angles of attack, the vortex layers detach at the leading edge to form free shear layers. Flow characteristics are heavily influenced by the leading edge sweep angle, leading edge radius, and Reynolds number. Moreover, vortex breakdown phenomena arise at higher angles of attack, depending mainly on the sweep angle. This paper includes parts of the "Initial Validation Study", where grid resolution studies are completed before variation of e.g. sweep angle, angle of sideslip is performed. Starting with this VFE2 (φ=65°) configuration, the grid resolution outcome will be compared with the experimental data from Technical University Munich and Onera at 5°, 13° and 23° angles of attack, comprising force and moment coefficients, pressure data and surface oil pictures.
Grid Resolution Study of Delta Wing Flow with the Lattice Boltzmann Approach
2014
7 Seiten, Bilder, Tabellen, 14 Quellen
Aufsatz (Konferenz)
Englisch
The Lattice Boltzmann Method for Flapping Wing Aerodynamics
British Library Conference Proceedings | 2010
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