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Mean streamwise velocity profiles as a function of x2 in (a) linear scale and (b) logarithmic scale for R550 (O), R950 (∇), R2000 (□), NS550 (– – –), NS950 (– - – -) and NS2000 (⋯ ⋯). In panel (b), the velocity profiles of Robin-bounded cases are vertically shifted such that the centreline velocity coincides with their corresponding wall-bounded case. For clarity, profiles at Reτ ≈ 950 and Reτ ≈ 2000 are additionally shifted by 5 and 10 plus units, respectively.
