| Autor: |
Ertunç, Ö., ÖzyIlmaz, N., Lienhart, H., Durst, F. |
| Zdroj: |
Advances in Turbulence XII; 2009, p553-556, 4p |
| Abstrakt: |
The homogeneity of turbulence, generated by static grid structures, was investigated in a complementary manner with the help of hot-wire measurements in a wind tunnel and direct numerical simulations based on the lattice Boltzmann method. The measurements were conducted downstream a grid having 64% porosity by varrying the mesh Reynolds number in the range 4000-8000. The direct numerical simulations were performed at a constant mesh Reynolds number of 1400, varying the grid porosity from 53% to 82%. It is shown that the mean streamwise velocity becomes rapidly homogeneous, whereas the Reynolds stresses do not become homogeneous, at all, downstream of uniform grids. The reported investigations revealed no dependence of the inhomogeneity of Reynolds stresses on mesh Reynolds number and grid porosity. The analysis of the simulations showed that the early homogenization of the mean velocity field hinders the homogenization of the turbulence field. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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