DNS of compressible turbulent boundary layer around a sharp cone |
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Authors: | XinLiang Li DeXun Fu YanWen Ma |
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Institution: | (1) Center for Flow Physics and Control, University of Notre Dame, Notre Dame, Indiana 46556-5684, USA;(2) Present address: Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, USA; |
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Abstract: | Direct numerical simulation of the turbulent boundary layer over a sharp cone with 20° cone angle (or 10° half-cone angle)
is performed by using the mixed seventh-order up-wind biased finite difference scheme and sixth-order central difference scheme.
The free stream Mach number is 0.7 and free stream unit Reynolds number is 250000/inch. The characteristics of transition
and turbulence of the sharp cone boundary layer are compared with those of the flat plate boundary layer. Statistics of fully
developed turbulent flow agree well with the experimental and theoretical data for the turbulent flat-plate boundary layer
flow. The near wall streak-like structure is shown and the average space between streaks (normalized by the local wall unit)
keeps approximately invariable at different streamwise locations. The turbulent energy equation in the cylindrical coordinate
is given and turbulent energy budget is studied. The computed results show that the effect of circumferential curvature on
turbulence characteristics is not obvious. |
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Keywords: | |
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