期刊
PHYSICS OF FLUIDS
卷 33, 期 11, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0070912
关键词
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资金
- JSPS KAKENHI [18H01367]
- DII collaborative Graduate Program for Accelerating Innovation in Future Electronics, Nagoya University
- Grants-in-Aid for Scientific Research [18H01367] Funding Source: KAKEN
Turbulent characteristics in the far field of active-grid turbulence were investigated using hot-wire anemometry in wind tunnel experiments. The integral length scale slightly decreases with streamwise distance in the far field for the double-random modes, while the nondimensional dissipation rate is around 0.5. Regardless of active-grid motions, an equilibrium scaling with a constant C-e is established in the far field of the double-random modes.
Turbulent characteristics in the far field of active-grid turbulence have been investigated through wind tunnel experiments using hot-wire anemometry. Two forcing protocols are employed following previous studies: one is the double-random mode and the other is the open mode with the grid remaining static with minimum blockage. The integral length scale L for the double-random modes slightly decreases with streamwise distance in the far field as observed in the near field of the active-grid turbulence. The nondimensional dissipation rate C-e for the double-random modes is around 0.5. This asymptotic value is different from those reported in previous active-grid turbulence experiments and could be nonuniversal. The equilibrium scaling L / ? = CeRe?/15 (? is the Taylor microscale and Re-? is the turbulent Reynolds number) with a constant C-e is established in the far field of the double-random modes regardless of active-grid motions. The sum of production and destruction terms in the enstrophy budget equation for homogeneous and isotropic turbulence S + 2 G / Re-? (S is the skewness of the longitudinal velocity derivative and G is the destruction coefficient) is proportional to Re-?(-1) and close to zero in the present active-grid turbulence, suggesting that the equilibrium scaling is possibly related to the balance between the production and destruction of the enstrophy.
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