Accurate and Efficient Explicit Approximations of the Colebrook Flow Friction Equation Based on the Wright ?-Function: Reply to Discussion

Dejan Brkić and Pavel Praks
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Dejan Brkić: Research and Development Center “Alfatec”, 18000 Niš, Serbia
Pavel Praks: IT4Innovations, VŠB-Technical University of Ostrava, 708 00 Ostrava, Czech Republic

Mathematics, 2019, vol. 7, issue 5, 1-7

Abstract: This reply gives two corrections of typographical errors in respect to the commented article, and then provides few comments in respect to the discussion and one improved version of the approximation of the Colebrook equation for flow friction, based on the Wright ?-function. Finally, this reply gives an exact explicit version of the Colebrook equation expressed through the Wright ?-function, which does not introduce any additional errors in respect to the original equation. All mentioned approximations are computationally efficient and also very accurate. Results are verified using more than 2 million of Quasi Monte-Carlo samples.

Keywords: Colebrook equation; hydraulic resistance; Lambert W-function; Wright ?-function; explicit approximations; computational burden; turbulent flow; friction factor (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2019
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