FLUID-STRUCTURE INTERACTION WITH VISCOELASTICITY IN NUMERICAL SIMULATION OF WATER HAMMER

B. MESSAOUDENE, M. FERROUK

Abstract


This paper presents the numerical simulation of water hammer considering the mechanical rheological behavior of plastic pipes, HDPE (high density polyethylene) or PVC (polyvinyl chloride), involving transient liquid flows. In past or current applications based on the incorporation of unsteady friction, it has been widely observed that pressure damping effects are not sufficient to correctly predict the experimental data. Therefore, to solve this problem, it becomes important to also add the deformation effects of the selected pipe wall material. The detailed analysis of the viscoelastic model shows that the creep function deserves special attention: the parameters (creep compliance) and (retarded time) must be well calibrated to obtain a perfect match between the laboratory data and the numerical results. Apart from these sometimes over-demanding concerns, the incorporation of the viscoelastic model seems sufficient to compensate for the pressure damping that eludes other traditional friction models such as the Brunone and Vardy-Brown models.


Keywords


Water hammer, Hydraulic transient, Wave propagation, MOC, Viscoelasticity.

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References


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