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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

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

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

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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