高レイノルズ数乱流場の統計的性質 : 第1報,局所等方性理論の検証
1989 年 55 巻 515 号 p. 1847-1854
詳細
1989 年 55 巻 515 号 p. 1847-1854
The local similarity hypothesis was verified in quasi-isotropic turbulent flow fields with turbulence Reynolds numbers of over 3000. The quasi-equilibrium range was known to exist in a turbulence field with turbulence Reynolds numbers of Reτ >60. The lowest wave number of the quasi-equilibrium range in the energy spectrum was dependent on TL/TO : the ratio between the time scale of decay of turbulence energy and the characteristic time scale o an energy-containing eddy. Turbulent eddies with characteristic time scales of less than TL/4 were statistically stable. The energy dissipation rate was theoretically determined as ε=C1(q2/2)3/2/lO, and the scales of turbulence were estimated from C1 and Reλ.
