Shear flow and viscosity in single-layer hydraulics

Andrew Mc C. Hogg*, Graham O. Hughes

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    We calculate solutions for one-layer hydraulically controlled flows with viscosity. Viscosity and bottom drag produce two key modifications to inviscid hydraulic theory: the position of the hydraulic control point is altered, and the solution requires knowledge of the velocity profile over the entire domain. Hence, analytically tractable solutions are not generally possible and a numerical technique is developed to calculate such flows. In this paper, bottom drag and fluid viscosity are treated as independent parameters, allowing the influence of each parameter on flux, flow dissipation and position of hydraulic control to be quantified. We find that the flow is determined primarily by the bottom drag, and, surprisingly, the largest perturbation from this state occurs for intermediate values of fluid viscosity.

    Original languageEnglish
    Pages (from-to)431-443
    Number of pages13
    JournalJournal of Fluid Mechanics
    Volume548
    DOIs
    Publication statusPublished - 10 Feb 2006

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