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- W2004095932 abstract "The validity of the quasinormal approximation, which relates the fourth-order velocity correlations to second-order velocity correlations, is tested using data obtained from direct numerical simulation (DNS) of turbulent channel flow at Reτ≈590. Results indicate that the quasinormal approximation is accurate throughout the channel except for a thin layer near the wall (y+<50), where the approximation breaks down for small separations (r+<200). Comparison to an analysis of the quasinormal approximation in isotropic turbulence indicates that except very near the wall, the quasinormal errors are of comparable magnitude in the channel and isotropic turbulence. This suggests that use of the quasinormal approximation in turbulence models such as EDQNM and optimal large eddy simulation (LES) will be comparably accurate in the channel at y+>50 as it is for isotropic turbulence. This study is motivated by the need to model fourth-order correlations in optimal LES. To evaluate the impact of errors like those observed on optimal LES models, an optimal LES model incorporating the quasinormal approximation was used in isotropic turbulence and the simulation results were compared to those from LES models based solely on DNS data. The use of the quasinormal approximation in our optimal LES model resulted in degradation of the high wavenumber spectrum, a sign of a somewhat reduced dissipation of the model. However, the results are sufficiently encouraging to warrant further development of LES models using the quasinormal approximation." @default.
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- W2004095932 date "2005-04-29" @default.
- W2004095932 modified "2023-10-13" @default.
- W2004095932 title "Validity of quasinormal approximation in turbulent channel flow" @default.
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- W2004095932 doi "https://doi.org/10.1063/1.1886746" @default.
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