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- W3191141886 abstract "Abstract The impact and lift‐off parameters of particles play a key role in the understanding of the saltation mechanisms in aeolian environment. However, limitations of experimental instruments and numerical simulation may result in unreliable motion parameters near the bed surface. Here, we report on the impact and lift‐off parameters of saltating particles in wind‐blown sand predicted with Reynolds‐averaged Navier–Stokes (RANS) or large eddy simulation (LES) and the three‐dimensional stochastic particle‐bed collision model. Simulation results showed new phenomena, including: (a) a reduced mean impact velocity and an increased probability of lift‐off velocities distribution at left extreme with increasing free stream velocity, and (b) two peaks of the impact angle distribution. These phenomena disappear when the statistical height is increased to five times the particle diameter, suggesting that the near‐wall motions are not negligible. In addition, when turbulence is considered and wind velocity increases, the extreme value of velocity distribution increases, impact angle distribution shows a longer tail, and mean impact and lift‐off parameters increase (except impact velocity). We conclude that new velocity distribution with near‐wall motions and turbulence will significantly improve the prediction of aeolian transport flux." @default.
- W3191141886 created "2021-08-16" @default.
- W3191141886 creator A5001846024 @default.
- W3191141886 creator A5023088652 @default.
- W3191141886 creator A5072716527 @default.
- W3191141886 date "2021-08-01" @default.
- W3191141886 modified "2023-10-16" @default.
- W3191141886 title "Characterization of Wind‐Blown Sand With Near‐Wall Motions and Turbulence: From Grain‐Scale Distributions to Sediment Transport" @default.
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