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. Author manuscript; available in PMC: 2020 Jun 10.

Published in final edited form as: J Fluid Mech. 2019 Jun 10;868:698–725. doi: 10.1017/jfm.2019.209

Figure 19. — (Colour online) (a) Diagnostic function $Ξ = x_{2} \partial 〈 u_{1} 〉 / \partial x_{2}$ for NS550 (∇), NS950 (O), R550-lplus (– – –) and R950-lplus (⋯ ⋯). (b) Plot of ℇ_l2 as a function of Re_τ for wall-bounded cases NS550 and NS950 (O), and Robin-bounded cases R550-lplus and R950-lplus (×).