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Journal of Hydraulic Engineering / Volume 130 / Issue 11 / TECHNICAL PAPERS

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Efficient Approximation of Unsteady Friction Weighting Functions

J. Hydraul. Eng. 130, 1097 (2004); http://dx.doi.org/10.1061/(ASCE)0733-9429(2004)130:11(1097) (11 pages)

Alan Vardy, F.ASCE1 and Jim Brown2

1Research Professor, Civil Engineering Division, Univ. of Dundee, Dundee DD1 4HN, Scotland.
2Research Fellow, Civil Engineering Division, Univ. of Dundee, Dundee DD1 4HN, Scotland.

(Submitted 11 September 2003; accepted 10 February 2004)

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.

© 2004 ASCE

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ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1061/(ASCE)0733-9429(2004)130:11(1097)

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0733-9429 (print)  
1943-7900 (online)

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ASCE

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