Direct numerical simulation for a time-developing combined-convection boundary layer along a vertical flat plate
Time-developing combined-convection boundary layers induced by imposing aiding and opposing flows to the natural-convection boundary layer in air along a hot vertical flat plate have been examined with a direct numerical simulation. As the freestream velocity increases, the transition from laminar t...
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| Veröffentlicht in: | International journal of heat and mass transfer 2010-04, Vol.53 (9), p.2113-2122 |
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| container_title | International journal of heat and mass transfer |
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| creator | Abedin, Mohammad Zoynal Tsuji, Toshihiro Hattori, Yasuo |
| description | Time-developing combined-convection boundary layers induced by imposing aiding and opposing flows to the natural-convection boundary layer in air along a hot vertical flat plate have been examined with a direct numerical simulation. As the freestream velocity increases, the transition from laminar to turbulence delays for aiding flow and quickens for opposing flow, corresponding well to actual observations in space-developing flows. The calculated profiles of mean streamwise velocity, mean temperature, intensities of streamwise velocity fluctuation and temperature fluctuation in the laminarization process of the boundary layer for aiding flow agree relatively well with the existing data. Also, the distributions of turbulent statistics and instantaneous fluid motions in the combined-convection boundary layers with adding and opposing flows are displayed, and the regimes of the boundary layer flows obtained from the calculations are compared with those observed in the experiment. |
| doi_str_mv | 10.1016/j.ijheatmasstransfer.2009.12.044 |
| format | Article |
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As the freestream velocity increases, the transition from laminar to turbulence delays for aiding flow and quickens for opposing flow, corresponding well to actual observations in space-developing flows. The calculated profiles of mean streamwise velocity, mean temperature, intensities of streamwise velocity fluctuation and temperature fluctuation in the laminarization process of the boundary layer for aiding flow agree relatively well with the existing data. 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| ispartof | International journal of heat and mass transfer, 2010-04, Vol.53 (9), p.2113-2122 |
| issn | 0017-9310 1879-2189 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Boundary layer Boundary layer and shear turbulence Combined convection Computational fluid dynamics Convection and heat transfer Convective heat transfer Direct numerical simulation Exact sciences and technology Flat plates Fluctuation Fluid dynamics Fluid flow Fundamental areas of phenomenology (including applications) Mathematical analysis Physics Transition Turbulence Turbulent boundary layer Turbulent flow Turbulent flows, convection, and heat transfer |
| title | Direct numerical simulation for a time-developing combined-convection boundary layer along a vertical flat plate |
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