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Ninth International Symposium on Turbulence and Shear Flow Phenomena
June 30 - July 3, 2015, University of Melbourne, Australia

DOI: 10.1615/TSFP9

DNS OF THERMALLY-STRATIFIED TURBULENT BOUNDARY LAYERS SUBJECTED TO ADVERSE PRESSURE GRADIENT

pages 607-612
DOI: 10.1615/TSFP9.1020
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要約

The objective of this study is to investigate and observe turbulent heat transfer structures and statistics in thermallystratified turbulent boundary layers subjected to a nonequilibrium adverse pressure gradient (APG) by means of direct numerical simulation (DNS). DNSs are carried out under conditions of neutral, stable and unstable thermal stratifications with a non-equilibrium APG, in which DNS results reveal heat transfer characteristics of thermallystratified non-equilibrium APG turbulent boundary layers. In cases of thermally-stratified turbulent boundary layers affecting APG, heat transfer performances increase in comparison with a turbulent boundary layer with neutral thermal stratification and zero pressure gradient. The characteristic turbulent statistics of both the velocity and the thermal fields along streamwise direction are clearly indicated, in which the decrease of log-law profile of streamwise mean velocity which was found by experimental study is also observed in the neutral boundary layer of our DNS. DNS results reveal that the turbulent characteristics of both cases of stable and unstable thermal stratifications boundary layers are different to the turbulent characteristics of the neutral boundary layer having APG.

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