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A time-developing boundary layer flow on a flat plate from laminar to turbulence has been calculated with a direct numerical simulation. The profiles of mean velocity and fluctuating velocity components obtained in the turbulent region are excellently coincided with the existing simulation and measurements, when the comparisons are made for the Reynolds number based on the displacement thickness of the boundary layer. Consequently, it is expected that the direct numerical simulation of time-developing flows can provide various information with regard to usual turbulent boundary layers.
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