Further developments in rapidly decelerating turbulent pipe flow modeling

2013-2014 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptPublishe

Numerical study of the blockage length effect on the transient wave in pipe flows

202310 bcchAccepted ManuscriptRGCOthersNational Natural Science Foundation of ChinaPublishe

Influence of nonlinear turbulent friction on the system frequency response in transient pipe flow modelling and analysis

202310 bcchAccepted ManuscriptRGCOthersHong Kong Polytechnic UniversityPublishe

Transient frequency responses for pressurized water pipelines containing blockages with linearly varying diameters

202310 bcchAccepted ManuscriptRGCOthersHong Kong Polytechnic UniversityPublishe

Local and integral energy-based evaluation for the unsteady friction relevance in transient pipe flows

202310 bcchAccepted ManuscriptRGCOthersHong Kong Polytechnic University (HKPU); University of Perugia; and Royal Society of New ZealandPublishe

The influence of non-uniform blockages on transient wave behavior and blockage detection in pressurized water pipelines

202308 bcchAccepted ManuscriptRGCOthersRoyal Society of New Zealand; Hong Kong Polytechnic UniversityPublishe

Experimental and numerical analysis of flow instabilities in rectangular shallow basins

Free surface flows in several shallow rectangular basins have been analyzed experimentally, numerically and theoretically. Different geometries, characterized by different widths and lengths, are considered as well as different hydraulic conditions. First, the results of a series of experimental tests are briefly depicted. They reveal that, under clearly identified hydraulic and geometrical conditions, the flow pattern is found to become nonsymmetric, in spite of the symmetrical inflow conditions, outflow conditions and geometry of the basin. This non-symmetric motion results from the growth of small disturbances actually present in the experimental initial and boundary conditions. Second, numerical simulations are conducted based on a depth-averaged approach and a finite volume scheme. The simulation results reproduce the global pattern of the flow observed experimentally and succeed in predicting the stability or instability of a symmetric flow pattern for all tested configurations. Finally, an analytical study provides mathematical insights into the conditions under which the symmetric flow pattern becomes unstable and clarifies the governing physical processes