Flow over a flat plate with uniform inlet and incident coherent gusts
The flow over a flat plate at a Reynolds number of 750 is numerically investigated via fine Large Eddy Simulation (LES) first, at normal (90 0) and then at oblique (45 0) incidence flow direction with a uniform steady inlet. The results are in complete agreement to the Direct Numerical Simulation (DNS) and experimental data, thereby serving as a validation for the present simulations. For the normal (90 0) uniform inflow case, coherent vortices are alternatively shed from both leading edges of the plate, whereas for the oblique (45 0) uniform inflow case the shedding from the two sides of the plate interact strongly resulting in a quasi-periodic force response. The normal flat plate is then analyzed with an incident gust signal with varying amplitude and time period. For these incident coherent gust cases, a reference test case with variable coherent inlet is first studied and the results are compared to a steady inlet simulation, with a detailed analysis of the flow behavior and the wake response under the incident gust. Finally, the flat plate response to 16 different gust profiles is studied. Transient drag reconstruction for these incident coherent gust cases is then presented based on frequency dependent transfer function and phase spectrum analysis.
Imran Afgan, Sofiane Benhamadouche, Xingsi Han, Pierre Sagaut, Dominique Laurence. Flow over a flat plate with uniform inlet and incident coherent gusts. Journal of Fluid Mechanics, Cambridge University Press (CUP), 2013, 720, pp.457-485. ⟨10.1017/jfm.2013.25⟩. ⟨hal-01715550⟩
Journal: Journal of Fluid Mechanics
Date de publication: 01-01-2013