engleski

NUMERICAL MODELS FOR ANALYSIS OF HYDRAULIC TRANSIENTS

This paper focuses on the analysis of standard hydraulic transients in pressure systems: water-mass oscillations, water hammer and changes in pump operation regime due to the rupture in pipeline. The research has been conducted on the open-source numerical models based on the method of characteristics (Allievi) and finite-volume method (OpenModelica). Parameters defined within the numerical models have been calibrated based on the measurements on physical models. The model simulation results show that OpenModelica is superior to Allievi when pressures during transient stages are being analysed. OpenModelica considers full thermodynamic formulations while simulating pressure flow what makes it more complicated regarding defining a model as well as manipulating with the numerical model. On the other hand, Allievi is simpler and more applicable if practical engineering problems are analysed. Furthermore, it can be used as an upgrade of the existing numerical models of pressure systems such as Epanet.

hydraulic transients, pressured systems, numerical modelling, Allievi, OpenModelica

nije evidentirano