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Structures of Density Fluctuations at a Low-Mach-Number Turbulent Boundary Layer by DNS

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2280
pages 2212-2221

Takashi Ohta
Department of Mechanical Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871; Department of Mechanical Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan

H. Kajima
Department of Mechanical Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan


We performed a direct numerical simulation of a low-Mach-number turbulent boundary layer using fundamental equations of compressible flow to investigate the relation between vortex structures and the density distribution. A fully developed turbulent boundary layer is reproduced in the simulation. From the turbulence statistics and instantaneous structures, we identified different features in the three regions of a near-wall field, far field and a flow field outside the turbulent boundary layer. We then observed fine-scale structures of the density fluctuation that are strongly related to turbulent vortices in the vicinity of the wall. In addition, there are large-scale density structures in the upper boundary layer. The large-scale structures seem to correlate with the fine-scale structures close to the wall, with there being a non-steady larger-scale density fluctuation profile in the outer region of the boundary layer.

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