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- W4289277615 abstract "Direct numerical simulations are performed for grid-generated turbulence with low Reynolds numbers to study the interscale transfer of turbulent energy. The Reynolds numbers based on the uniform velocity and grid mesh size, M , are set to R e M = 5000 , 9000, and 15000. The results show that, for R e M = 9000 and R e M = 15000 , the turbulent dissipation constant increases in the upstream region but it becomes nearly constant in the region of x / M > 15 . In contrast, for R e M = 5000 , it continues to increase and do not level off even in the downstream region. Scale-by-scale analysis using the Karman–Howarth–Monin–Hill equation indicates that, the non-linear transfer term balances with the dissipation term for all the cases. Instead, it is found that, in the downstream region of the R e M = 5000 case, where the turbulent Reynolds number becomes R e λ < 25 , the contribution of the advection term varies depending on the streamwise positions. Further analysis for the one-point statistics indicates that, in such conditions, the coherences among the advection term, dissipation term, and diffusion term become small at small scales, while they are generally large in the other cases including the upstream region for R e M = 5000 . These indicate that energy cascade mechanism in the downstream region for R e M = 5000 is different from the cases of 30 < R e λ < 60 , even though both of them are generally considered as small R e λ , and it is caused by the increase of the dissipation scale range appearing in the transition period to the final decay. • DNSs are performed for grid turbulence with low Reynolds numbers. • Interscale transfer of turbulent energy is revealed by scale-by-scale analysis. • Turbulent dissipation coefficient is not constant even in the downstream region. • Contribution of advection term changes with Reynolds number. • Increase of dissipation scale range in transition period to final decay causes it." @default.
- W4289277615 created "2022-08-01" @default.
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- W4289277615 date "2022-10-01" @default.
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- W4289277615 title "Interscale transfer of turbulent energy in grid-generated turbulence with low Reynolds numbers" @default.
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- W4289277615 doi "https://doi.org/10.1016/j.ijheatfluidflow.2022.109031" @default.
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