2026-10-12T09:28:05Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34000850 2026-09-25T18:01:06Z category_24 category_272 category_873 category_734 category_811 category_135 portal_5 item_type_3 month_year_09_2026

<p>Working case design of numerical simulation.</p> Xu Wang (28596) Xiangkun Yang (3590129) Fan Wang (135182) Na Xu (188237) Yicai Teng (25111787) Zheng Qin (11221593) Ping Yu (215536) Evolutionary Biology Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified Biological Sciences not elsewhere classified Mathematical Sciences not elsewhere classified Computational Biology weir fishway structure turbulent kinetic energy overflow weir fishways lower turbulence intensity typical pool chamber flow regime shifts fundamental hydraulic characteristics form plunging flow three flow regimes flow regime plunging flow hydraulic characteristics evolution characteristics transition flow streaming flow hydraulic regimes hydraulic optimization flow patterns flow field vertical drop variation laws systematically analyzed study reveals structural design results show pool depth nine cases jointly controlled inlet discharge inflow discharge dissipation rate basic type based investigation also summarized adjacent pools <div><p>Overflow weir fishways represent a basic type of pool-and-weir fishway structure. To investigate its hydraulic characteristics, this study conducts numerical simulations to obtain the flow field in a typical pool chamber. A total of nine cases are designed by varying the inlet discharge and pool depth, and the flow patterns, velocity distribution, turbulent kinetic energy, and dissipation rate are systematically analyzed. Three flow regimes are identified: plunging flow, streaming flow, and transition flow. The variation laws of these regimes with inlet discharge and pool depth are obtained. The distributions and evolution characteristics of velocity, turbulent kinetic energy, and dissipation rate are also summarized. The results show that the flow regime is jointly controlled by inflow discharge and vertical drop between adjacent pools. With the increase of inflow discharge, the flow regime shifts from plunging flow to transition flow and then to streaming flow. Under the same inflow discharge, a larger vertical drop tends to form plunging flow with lower turbulence intensity. This study reveals the fundamental hydraulic characteristics of overflow weir fishways and provides a reference for the structural design and hydraulic optimization of such fishways.</p></div> 2026-09-25T18:00:42Z Dataset Dataset 10.1371/journal.pone.0345694.t002 https://figshare.com/articles/dataset/_p_Working_case_design_of_numerical_simulation_p_/34000850 CC BY 4.0