Coupled approach and calculation of the discrete vapour cavity model

Ghodhbani, Abdelaziz; Akrout, Mohsen; Taïeb, Ezzeddine Haj

doi:10.1016/j.jfluidstructs.2019.102691

Cited by 10 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figure 1, △…△… indicates the spot and time range where the collapsing occurs. However, if the broken water column and the cavitation area are long and the gas release causes a significant change in the wave velocity, the calculation and the grids of the characteristic line are much more complicated [20,36].…”

Section: Methods Of the Floating Gridmentioning

confidence: 99%

“…The water hammer wave speed is greatly affected by the gas content in the fluid, and the water hammer wave speed directly affects the pressure boosting water hammer. Therefore, the influence of the gas content on the water hammer wave speed cannot be ignored; otherwise, the accuracy of the calculation results is greatly affected [17,20]. The main assumptions of the traditional discrete vapor cavity model (DVCM) are analyzed below to demonstrate its disadvantages [20][21][22]:…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Simulation Calculation Method of a Water Hammer with Multpoint Collapsing

Yang

Wang

et al. 2020

Energies

View full text Add to dashboard Cite

The traditional discrete vapor cavity model (DVCM) is widely used in water hammer simulation. Water column separation in pipelines is usually predicted with this model. Nevertheless, the main weaknesses of this model consist of numerical instability and nonconvergence. Regarding the weaknesses of the traditional model, this paper discusses an improved method. The new method uses a new water hammer velocity formula, a new cavity model, and a floating grid method. Through simulations to test the effects of the new model, an experimental platform can be established to realize a water hammer with multipoint collapsing. The numerical simulation was programmed in C++ and the test was carried out with an actual pipeline model built in the laboratory. After certain modelling and calibration, the parameters in the simulation calculation were consistent with the measured parameters in the test. The numerical simulation results were compared with the experimental results. For the hydraulic transient system with multipoint collapsing, the superposition effect of the wave crest of the pseudo-water hammer in the traditional calculation model was obvious. The pressure of the water hammer in the simulation calculation was significantly higher than the actual value and the convergence effect of the water hammer wave was not good. Compared with the results of the traditional model, the simulation results of the new model were closer to the measured values. Therefore, the new model has better numerical solution accuracy, stability, and convergence, which is worth further study and promotion.

show abstract

Section: Methods Of the Floating Gridmentioning

confidence: 99%