Efficient approximation of unsteady friction weighting functions

Alan Vardy, Jim Brown

    Research output: Contribution to journalArticlepeer-review

    43 Citations (Scopus)


    A simple method is presented for evaluating wall shear stresses from known flow histories in unsteady pipe flows. The method builds on previous work by Trikha, but has two important differences. One of these enables the method to be used with much larger integration time steps than are acceptable with Trikha's method. The other, a general procedure for determining approximations to weighting functions, enables it to be used at indefinitely small times (high frequencies). The method is applicable to both laminar and turbulent flows.
    Original languageEnglish
    Pages (from-to)1097-1107
    Number of pages11
    JournalJournal of Hydraulic Engineering
    Issue number11
    Publication statusPublished - 2004


    • Skin friction
    • Turbulent flow
    • Laminar flow
    • Pipe flow
    • Unsteady flow
    • Shear stress


    Dive into the research topics of 'Efficient approximation of unsteady friction weighting functions'. Together they form a unique fingerprint.

    Cite this