Large-Eddy Simulation of Laminar-Turbulent Transition in a Swept-Wing Boundary Layer
摘要：
The spatial development of laminar#turbulent transition in a 45 # swept#wing boundary layer is investigated using the large#eddy simulation ap# proach. Both stationary and traveling disturbances are initiated by steady and random forcings. The numerical simulations reproduce the surface shear streaks typical of the cross#ow instability observed in experiments. Downstream of the transition loca# tion the wall shear stress is found to turn towards the streak direction. The strength of the stationary vortices grows exponentially# initially independent of the unsteady forcing amplitude and saturates at di#erent levels during the later development# de# pending on the magnitude of the traveling vortices. Streamwise velocity contours show the evolution from a wave#like structure to the #half#mushroom# structure for the lower#amplitude# traveling#wave case# leading to double in#ection points in the wall# normal velocity pro#les prior to transition# the non# linear interactions involving the ...
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DOI：
10.2514/6.1997-750
被引量：
年份：
1997
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