A four-equation friction model for water hammer calculation in quasi-rigid pipelines
| Autor: | Ezzeddine Haj Taieb, Abdelaziz Ghodhbani |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Water hammer
Engineering business.industry Mechanical Engineering Flow (psychology) Laminar flow 02 engineering and technology Mechanics Structural engineering 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Pipeline transport Hydraulic head 020303 mechanical engineering & transports 0203 mechanical engineering Method of characteristics Mechanics of Materials 0103 physical sciences Coupling (piping) General Materials Science Transient (oscillation) business |
| Zdroj: | International Journal of Pressure Vessels and Piping. 151:54-62 |
| ISSN: | 0308-0161 |
| DOI: | 10.1016/j.ijpvp.2017.03.001 |
| Popis: | Friction coupling affects water hammer evolution in pipelines according to the initial flow regime. Unsteady friction models are only validated with uncoupled formulation. On the other hand, coupled models such as four-equation model, provide more accurate prediction of water hammer since fluid-structure interaction (FSI) is taken into account, but they are limited to steady-state friction formulation. This paper deals with the creation of the “four-equation friction model” which is based on the incorporation of the unsteady head loss given by an unsteady friction model into the four-equation model. For transient laminar flow cases, the Zielke model is considered. The proposed model is applied to a quasi-rigid pipe with axial moving valve, and then calculated by the method of characteristics (MOC). Damping and shape of the numerical solution are in good agreement with experimental data. Thus, the proposed model can be incorporated into a new computer code. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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