Numerical modelling of unsteady turbulent flow in tubes, including the effects of roughness and large changes in Reynolds number

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Abstract

A method has been developed for predicting unsteady turbulent friction in smooth, transitional and rough pipe flow. For transitional and rough pipe flow the effective viscosity at the wall is varied depending on Reynolds number and roughness. An approximation has been made for the transition region by using a cubic spline for the friction factor between the smooth and rough regions.
This turbulence model can be implemented readily in several types of numerical model for pipe flow, including simple lumped parameter models, finite difference/finite element methods and the Method of Characteristics. An approximate method for representing changes in turbulence energy is discussed. Using this, the method is suitable for small and large changes in flow, and for short and long time scales, but further validation is needed.
Original languageEnglish
Pages (from-to)1874-1885
Number of pages12
JournalProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
Volume225
Issue number8
Early online date10 May 2011
DOIs
Publication statusPublished - Aug 2011

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