Numerical modeling of laminar free overfall in triangular channels

Drešar, Primož (avtor), Hočevar, Marko (avtor), Blagojevič, Marko (avtor), Bizjan, Benjamin (avtor)

Design of open channel transport and flow measurement systems for highly viscous liquids requires accurate modelling of laminar free overfall. In this study, a computational fluid dynamics model was developed to investigate subcritical laminar free overfall in smooth horizontal channels with 90° isosceles triangle cross-section. Volume of fluid-based simulations were performed at different liquid discharges and viscosities, with Reynolds numbers at normal uniform depth between 5.5 and 139. Simulation results were in good agreement with verification experiments, indicating development of laminar velocity magnitude profiles while gauge pressure profiles resemble hydrostatic distribution except near the brink. The end-depth-ratio ranged between 0.80 and 0.96, reducing towards values reported for turbulent free overfall in the highest Reynolds number simulation. Existing models for critical depth, end depth discharge and free overfall jet trajectories were in satisfactory agreement above Re = 10, while producing larger deviations below this threshold due to increased viscous effects.

• Jezik: Angleški jezik
• Ključne besede: free overfall, open channel flow, laminar flow, computational fluid dynamics, volume of fluid, end depth ratio, laminarni tok, računalniška dinamika tekočin, tok v odprtih kanalih
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: 11 str.
• Številčenje: Vol. ǂ15, iss. ǂ4, art. 102650
• PID: 20.500.12556/RUL-160065
• UDK: 519.62:532
• ISSN pri članku: 2090-4495
• DOI: 10.1016/j.asej.2024.102650
• COBISS.SI-ID: 183107075
• Datum objave v RUL: 14.08.2024

Gradivo je del revije

• Naslov: Ain Shams Engineering Journal
• Skrajšan naslov: Ain Shams Eng. J.
• Založnik: Ain Shams University, Faculty of Engineering, Elsevier
• ISSN: 2090-4495
• COBISS.SI-ID: 68370435

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0401
• Naslov: Energetsko strojništvo