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dc.contributor.authorChang, Cheng-Kaien_US
dc.contributor.authorLu, Jau-Yauen_US
dc.contributor.authorLu, Shi-Yanen_US
dc.contributor.authorWang, Zhong-Xiangen_US
dc.contributor.authorShih, Dong-Sinen_US
dc.date.accessioned2020-10-05T02:01:02Z-
dc.date.available2020-10-05T02:01:02Z-
dc.date.issued2020-05-01en_US
dc.identifier.urihttp://dx.doi.org/10.3390/w12051488en_US
dc.identifier.urihttp://hdl.handle.net/11536/155084-
dc.description.abstractThis study discusses the mechanism for the occurrence of equilibrium and non-equilibrium scour holes. By using a particle image velocimetry (PIV) measurement system, it measures the turbulent flow fields in an open channel moving through the rough bed below a groundsill. Then, the Reynolds-stress model (RSM), embedded in FLUENT software, is applied to perform a numerical simulation. The experimental results show that at equilibrium, the location of the re-attachment point is significantly affected by the flow discharge. Further, the re-attachment point of the scour hole affects the size and range of the counterflow zone, which becomes the main region for deposits in the natural channel. In addition, the formation of erosion is mainly affected by turbulence intensity and Reynolds stress. However, in non-equilibrium scour holes, our results clearly show that the turbulence intensity and the Reynolds stress are significantly larger at the end of the scour holes near the bed due to the continual development of the scouring. The correlation between the numerical simulation and experimental results are also examined. Overall, it can be seen that the simulated mean velocity profiles are quite consistent with the measured data. However, in terms of turbulence intensities and Reynolds stress, the simulated results could be overestimated when compared with the measured data; they are overestimated with a sudden decrease near the liquid surface. Although, the simulations in the near bed area show some divergence and the trend in the scour hole is quite consistent. Therefore, numerical simulations can be performed in advance to act as an important reference when evaluating the safety of downstream structures.en_US
dc.language.isoen_USen_US
dc.subjectparticle image velocimetry (PIV)en_US
dc.subjectrough bedsen_US
dc.subjectscour holesen_US
dc.subjectturbulence intensityen_US
dc.subjectReynolds stress model (RSM)en_US
dc.titleExperimental and Numerical Investigations of Turbulent Open Channel Flow over a Rough Scour Hole Downstream of a Groundsillen_US
dc.typeArticleen_US
dc.identifier.doi10.3390/w12051488en_US
dc.identifier.journalWATERen_US
dc.citation.volume12en_US
dc.citation.issue5en_US
dc.citation.spage0en_US
dc.citation.epage0en_US
dc.contributor.department土木工程學系zh_TW
dc.contributor.departmentDepartment of Civil Engineeringen_US
dc.identifier.wosnumberWOS:000555915200267en_US
dc.citation.woscount0en_US
Appears in Collections:Articles