Evaluation of Unsteady Wall Shear Stress by Zielke’s Method
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 7
Abstract
The method used in the classical paper by Zielke to estimate the unsteady component of shear stress in unsteady pipe flows is revisited. It is found that the method is undesirably sensitive to the size of the integration time step. The sensitivity is shown to be caused dominantly by the first term in the integration when inadequate allowance is made for the infinite value of the weighting function. A simple method of avoiding the error without requiring the use of small grid sizes is presented.
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References
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Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 7 • July 2010
Pages: 453 - 456
Copyright
© 2010 ASCE.
History
Received: Jul 1, 2009
Accepted: Dec 9, 2009
Published online: Jun 15, 2010
Published in print: Jul 2010
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