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DNS of a turbulent boundary layer with passive scalar transport

Författare:	Li, Q., Schlatter, P., Brandt, L.B., Henningson, D.S.H.
Dokumenttyp:	Konferens
Tillstånd:	Publicerad
Tidskrift:	Direct and Large-Eddy Simulation VII
Volym:	329-335
År:	2008

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.