期刊
INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS
卷 18, 期 2, 页码 175-188出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10618560310001634177
关键词
heat transfer; free-stream turbulence; flat plate boundary layer; large eddy simulations
The structure near the flat plate leading edge of an incompressible boundary layer subjected to free-stream turbulence is investigated using large eddy simulation (LES) with a dynamic mixed subgrid-scale model. Free-stream turbulent intensities ranging from 1.5 to 10% are investigated. The evolutions of the velocity, temperature and turbulent intensity profiles inside the boundary layer and the characteristic length scales are analyzed and compared to a laminar flat plate boundary layer. The impact of the free-stream turbulence is examined for Reynolds numbers ranging from 0 (leading edge of the flat plate) to Re x =80,000 by using two consecutive spatial LESs. Bypass transition is found to occur in the early stage of the boundary layer development for all five cases presented here. The analysis indicates that the thermal turbulent structures transfer more energy and hence generate more thermal fluctuations in their wake than the dynamic structures.
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