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The Numerical Study of Open Channel Junctions with Extreme Confluence Angles for Surface Flow Without Wall Roughness
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0003-0820-617X
2019 (engelsk)Inngår i: E-proceedings of the 38th IAHR World Congress, International Association for Hydro-Enviroment Engineering and Research (IAHR) , 2019, s. 3620-3626Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Confluences exist not only in nature, like in streams or rivers but also constructed environment like the structures for sewage and urban rainfall drainage canals. In the natural environment, two tributaries join at an angle from 30° to 135°. Existing related research focuses on tributary angels within this mentioned range. However, in the constructed environment, channel junctions with its angle beyond this range may occur. Hydrodynamic data from a 90-degree flume confluence is taken from experiments, available in the literature. The information is used to build a numerical model on Delft 3D. The similar flow parameters are used, with the comparable cross-sectional dimensions, with three confluence geometries. Firstly, two confluences with a junction-angle of 0°, and then with an angle of 180° are studied, each with three flow cases. Free slip condition is supplied to elude the effect of wall roughness on flow behavior. Interesting results have been found and presented. It is noticed that geometries affect the location of vertical velocity and velocity distribution in the confluence area. The 180° confluence shows a big stagnation zone in the angled tributary. This study improves the understanding of the interaction between flow dynamics and confluence angles better.

sted, utgiver, år, opplag, sider
International Association for Hydro-Enviroment Engineering and Research (IAHR) , 2019. s. 3620-3626
Serie
Proceedings of the IAHR World Congress, ISSN 2521-7119, E-ISSN 2521-716X
Emneord [en]
Confluence, Extreme angle, Delft 3D, Hydraulic modeling, Surface flow patterns
HSV kategori
Forskningsprogram
Strömningslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-76408DOI: 10.3850/38WC092019-0589Scopus ID: 2-s2.0-85167781459OAI: oai:DiVA.org:ltu-76408DiVA, id: diva2:1361548
Konferanse
38th IAHR World Congress, 1-6 September, 2019, Panama City, Panama
Tilgjengelig fra: 2019-10-16 Laget: 2019-10-16 Sist oppdatert: 2024-03-07bibliografisk kontrollert

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