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• W3023796800 abstract "We analyse the inter-scale transfer of energy for two types of plane Poiseuille flow: the P4U exact coherent state of Park and Graham (2015) and turbulent flow in a minimal channel. For both flows, the dominant energy-producing modes are streamwise-constant streaks with a spanwise spacing of approximately 100 wall units. Since the viscous dissipation for these scales is not sufficient to balance production, the nonlinear terms redistribute the excess energy to other scales. Spanwise-constant scales (that is, Tollmien-Schlichting-like modes with zero spanwise wavenumber), in particular, account for a significant amount of net energy gain from the nonlinear terms. We compare the energy balance to predictions from resolvent analysis and we show that it does not model energy transfer well. Nevertheless, we find that the energy transferred from the streamwise-constant streaks can be predicted reasonably well by a Cess eddy viscosity profile. As such, eddy viscosity is an effective model for the nonlinear terms in resolvent analysis and explains good predictions for the most energetic streamwise-constant streaks. It also improves resolvent modes as a basis for structures whose streamwise lengths are greater than their spanwise widths by counteracting non-normality of the resolvent operator. Eddy viscosity does not respect the conservative nature of the nonlinear energy transfer which must sum to zero over all scales. It is less effective, consequently, for scales which receive energy from the nonlinear terms." @default.
• W3023796800 created "2020-05-13" @default.
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• W3023796800 date "2021-01-25" @default.
• W3023796800 modified "2023-10-18" @default.
• W3023796800 title "Energy transfer in turbulent channel flows and implications for resolvent modelling" @default.
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• W3023796800 doi "https://doi.org/10.1017/jfm.2020.929" @default.
• W3023796800 hasPublicationYear "2021" @default.
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