Discussion of “Jacobian Matrix for Solving Water Distribution System Equations with the Darcy-Weisbach Head-Loss Model” by Angus Simpson and Sylvan Elhay
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- 1 November 2012
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of Hydraulic Engineering
- Vol. 138 (11) , 1000-1001
Abstract
International audienceThe general recommendation by Simpson and Elhay (2011) that the Hazen-Williams formula be replaced by the Darcy-Weisbach is heartily applauded. Today, this fact cannot be disputed. The main purpose of this discussion is to recommend more appropriate formulas for the calculation of the Darcy friction factor, λ which are more suitable for computation of the derivatives in a Jacobian matrix, and also to clarify a few points in the calculation of the flowdependent JacobianKeywords
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