| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
In this research, direct numerical simulations of a turbulent plane jet were performed to clarify the role of very small-scale turbulence in the scalar mixing process of high Reynolds (Re) number jet. By analyzing the results at Re = 3000, 10000, 30000, we evaluated the Re-dependence of turbulent scalar mixing process. Furthermore, a threshold value of length scale below which a fine-scale turbulence does not affect the mixing process of turbulent jet was evaluated. For this purpose, sub-grid scale (SGS) turbulent kinetic energy and scalar variance were evaluated by filtering the DNS data, and compared with the grid scale (GS) components. The results showed that the turbulent length scales up to 60, 110, and 170 times of Kolmogorov scale are important in the scalar mixing process of jet, for Re = 3000, 10000, and 30000, respectively.
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