| Autor: |
Ma, Guo-Zhen, Xu, Chun-Xiao, Sung, Hyung Jin, Huang, Wei-Xi |
| Předmět: |
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| Zdroj: |
Physics of Fluids; Mar2022, Vol. 34 Issue 3, p1-7, 7p |
| Abstrakt: |
In this Letter, we propose a roughness scaling method based on the direct numerical simulation of turbulent channel flow over three-dimensional sinusoidal rough walls in a transitionally rough regime. A new coupling scale R e τ / ( k ¯ + S) n is defined by combining the Reynolds number R e τ and the roughness parameter k ¯ + S , where k ¯ + is the mean roughness height, S is the roughness steepness, and n is the scaling exponent—which depends on the roughness type. The relationships between R e τ , k ¯ + S , the roughness function, the friction factor, and the peak of the streamwise turbulent velocity fluctuation are explored. This approach provides an effective way for collapsing rough-wall turbulence data with different R e τ and k ¯ + S. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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