Momentum flux fluctuations in wall turbulence formulated along the distance from the wall
| Autor: | Mouri, H., Ito, J. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | PoF, 35, 075104 [2023] |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/5.0147875 |
| Popis: | Wall turbulence has a sublayer where the mean wall-normal flux of the streamwise momentum is constant. Via the law of the wall, this mean flux is related to the wall-normal profile of the mean streamwise velocity. However, the momentum flux has large fluctuations, for which the corresponding law is yet unknown. To formulate such a law, we decompose fluctuations of the streamwise and the wall-normal velocities. These are smoothed to single out a component that would dominate the momentum flux fluctuations. It is dependent on the wall-normal distance. We relate this dependence to the wall-normal profile of the streamwise velocity variance. The resultant law is consistent with laboratory and field data across a wide range of that distance and applies readily to wall modeling of a numerical simulation. Comment: 10 pages, to appear in Physics of Fluids (see https://pubs.aip.org/aip/pof ) |
| Databáze: | arXiv |
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