2022-08-20T02:31:38Zhttps://soar-ir.repo.nii.ac.jp/oaioai:soar-ir.repo.nii.ac.jp:000130112021-03-01T11:13:01ZRelations between Lagrangian and Eulerian Scales of Turbulence最大乱子の寿命時間と通過時間余越, 正一郎Estimations of the relations between the Eulerian and Lagrangian scales were made in the large Reynolds number turbulence. With the Eulerian and Lagrangian structural functions approximated by their inertial subrange forms between the appropriate passage-time and life-time limits, it was found that TL/TE=α/i, α=5/ 4√2 Ce3/2 / CL where TL is the Lagrangian integral time scale, equal to ∫∞₀ RL(τ)dτ where RL(τ) is the Lagrangian correlation coefficient of particle velocity for time lag τ. TE is the Eulerian integral time scale defined similarly to TL but in terms of the correlation coefficient RE(t) of eddy velocity at a fixed point. i is the intensity of turbulence. CE is the universal constant of the Eulerian structural function, nearly equal to 1.9. CL is the universal constant of the Lagrangian structural function. Simultaneous measurements of the Eulerian and Lagrangian properties of turbulence by an ultrasonic flowmeter and small particles floating on the surface of an open channel with uniform flow made it possible to estimate the value of α. The result was a≈0.41.Article信州大学工学部紀要 30: 119-127 (1971)departmental bulletin paper信州大学工学部1971-07-25application/pdf信州大学工学部紀要301191270037-3818AN00121228https://soar-ir.repo.nii.ac.jp/record/13011/files/Engineering30-09.pdfjpn