Efficient Approximation of Unsteady Friction Weighting Functions
Publication: Journal of Hydraulic Engineering
Volume 130, Issue 11
Abstract
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.
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Published In
Journal of Hydraulic Engineering
Volume 130 • Issue 11 • November 2004
Pages: 1097 - 1107
Copyright
Copyright © 2004 ASCE.
History
Published online: Oct 15, 2004
Published in print: Nov 2004
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