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DNS of a turbulent boundary layer with passive scalar transport
Abstract
A fully-resolved direct numerical simulation (DNS) of a spatially developing turbulent boundary layer with passive scalars over a flat plate under zero pressure gradient (ZPG) has been carried out using a spectral method with about 40M grid points. The highest Reynolds number based on the momentum thickness and free-stream velocity is $Re_\theta=850$ and the molecular Prandtl numbers for the scalars range from 0.2 to 2.0. The intermittent region near the boundary-layer edge was identified by investigating the high-order moments and PDF.
In addition, it was found that the streamwise velocity is similar to the scalar distribution at $Pr=0.71$ with isoscalar wall boundary condition. Far away from the wall, the two quantities become less correlated.
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