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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v39.i4.30
pages 312-324

On the Transient Flow Modeling by a Modified Characteristic Finite Volume Method

S. E. Razavi
School of Mechanical Engineering, University of Tabriz Tabriz, Iran
A. Sharbat Maleki
Dept. of Mechanical Engineering, Tabriz Branch, Islamic Azad University Tabriz, Iran

ABSTRAKT

Water hammer is a rapid change of pressure caused by a sudden variation of flow velocity in a pipeline. In extreme cases the pressure gain can destroy the pipeline. The increase of pressure during water hammer depends on pressure waves celerity which depends on pipe material and liquid parameters. In this paper, explicit finite-volume method is applied to model the water hammer phenomena. For convective flux treatment the averaging, and adapted Roe schemes have been applied and compared. Boundary conditions implementation such as reservoirs, valves and pipe junctions in the schemes benefits from the similar to that of the method of characteristics. For time- discretization a fifth-order Runge−Kutta scheme was applied which resulted in a better convergence and broadened range of stability. The pressure waves are captured with good accuracy where compared to the available data. The solution procedure consists of an iteration loop along with real time integration.


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