2020 Fiscal Year Annual Research Report
An investigation of the self-transition to turbulence by buoyancy force using compressible direct numerical simulation
| Project/Area Number |
19K14890
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| Research Institution | Kobe University |
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Principal Investigator |
LI CHUNGGANG 神戸大学, システム情報学研究科, 講師 (70650638)
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Keywords | Natural convection / Grossmann-Lohse theory / turbulent |
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| Outline of Annual Research Achievements |
The transition of natural convection in a vertical channel with hot-cold wall configuration has been simulated without adding any artificial fluctuation, which means the current result is more parameter-independent. It is found that the current existing empirical experience for the natural convection in a vertical channel cannot be applied. To investigate the physical insight, Grossmann-Lohse theory was applied to describe the turbulent behavior near the wall. The result shows that inside the boundary layer, the physical properties of the mean dominate the flow field. On the other hand, outside the boundary layer, the physical properties of the fluctuation dominate the flow field. Therefore, both laminar and turbulent behaviors are coexisted in the same flow field.
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