| Budget Amount *help |
¥21,190,000 (Direct Cost: ¥16,300,000、Indirect Cost: ¥4,890,000)
Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2014: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Outline of Final Research Achievements |
In this study, an accurate and robust numerical method for simulating transcritical turbulent flows at supercritical pressure is proposed, and fully-developed transcritical turbulent boundary layers (TBLs) at supercritical pressures are studied by solving the full compressible Navier-Stokes equations using direct numerical simulation (DNS). From the DNS results, besides the mean thermodynamic property variations, different from the conventional ideal-gas TBLs, significant density fluctuations that originate from the strong real fluid effects and the mechanisms of the non-negligible interactions between the real fluid effects and wall turbulence are identified in the transcritical TBLs. Then, based on the DNS analysis, a RANS model that accounts for the effects of density fluctuations is proposed, which improves the prediction accuracy of the TBLs at supercritical pressure, something that existing RANS models fail to do robustly.
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