The effect of domain size on direct numerical simulations of turbulent channels with periodic boundary conditions is studied. New simulations are presented up to Reτ = 4179 in boxes with streamwise and spanwise sizes of 2πh × πh, where h is the channel half-height. It is found that this domain is large enough to reproduce the one-point statistics of larger boxes. A simulation in a box of size 60πh × 6πh is used to show that a contour of the two-dimensional premultiplied spectrum of the streamwise velocity containing 80% of the kinetic energy closes at λx ≈ 100h.
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Letter| January 22 2014
Effect of the computational domain on direct simulations of turbulent channels up to Reτ = 4200
Adrián Lozano-Durán, Javier Jiménez; Effect of the computational domain on direct simulations of turbulent channels up to Reτ = 4200. Physics of Fluids 1 January 2014; 26 (1): 011702. https://doi.org/10.1063/1.4862918
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