Abstract
The effect of the shape of the grid on the decay of turbulence is studied through DNS. We performed simulations of regular, two-scale and fractal grids. The multi-scale grids are characterized by a strong anisotropy in the near field, and these achieve isotropy at the large scales much farther with respect to the single-scale grid. The decay of turbulent kinetic energy (TKE) is affected by the shape of the grid. In the anisotropic region of the fractal grid the decay exponent \(m=-2.89\) agrees with the values recently reported in literature. Once the flow achieves isotropy the decay is no longer influenced by the geometry of the grid, and the exponent recovers a value in the classical range \(-1.4 \le m \le -1\).
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© 2016 Springer International Publishing Switzerland
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D’Addio, P., Orlandi, P. (2016). Anisotropy of Multiscale Grid Turbulence. In: Peinke, J., Kampers, G., Oberlack, M., Wacławczyk, M., Talamelli, A. (eds) Progress in Turbulence VI. Springer Proceedings in Physics, vol 165. Springer, Cham. https://doi.org/10.1007/978-3-319-29130-7_41
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DOI: https://doi.org/10.1007/978-3-319-29130-7_41
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