Abstract
A turbulent flow behind a simple thin planar air foil with rounded edges at moderate angle of attack is studied. Reynolds number is about 65 000. First results of CFD analysis are presented, which will be validated with PIV measurements made by Institute of Thermomechanics of the Czech academy of Sciences. All the work is carried out to support the “New theory of flight” presented by Hoffman and Johnson [1]. Large eddy simulation is employed to verify the existence of streamwise vorticial structures and their description. The 3D transient simulation provides more information than the data from a set of PIV measurement planes and it offers also finer time resolution.
Highlights
The new theory of flight presented by [1] suggests methods of description of lift and drag forces that rely on the expected 3D structure of the air foil boundary layer and the wake
A flat plate 100x2 mm with half-cylindrical edges is approached by low turbulent cross flow (TI = 0.5 %) under 7° angle of attack
This is a good premise for the proper orthogonal decomposition (POD)
Summary
The new theory of flight presented by [1] suggests methods of description of lift and drag forces that rely on the expected 3D structure of the air foil boundary layer and the wake. The Institute of Thermomechanics of the Czech academy of Sciences has started a project to examine these structures experimentally. To verify the outcomes of their measurement CFD methods were employed. Most of the data presented in this paper are directly comparable with the experimental results presented in [2, 3, 4]
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