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3D simulations of flow past a cylindrical bridge pier for determination of drag coefficient as a function of Froude number
ID Novak, Gorazd (Author), ID Domínguez Alonso, José Manuel (Author)

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Abstract
Increasingly frequent floods demonstrate the vulnerability of bridges and their piers. Designing a pier involves determining its drag coefficient C_d. In the existing literature, C_d is given as a function of the Reynolds number Re, i.e. C_d=f(Re), while the present study also investigated C_d as a function of the Froude number Fr, i.e. C_d=f(Fr). The SPH method and the model DualSPHysics were used to simulate three-dimensional turbulent free-surface flows past a surface-piercing cylinder in a straight horizontal channel. Subcritical, critical, and supercritical flows with Fr<2 were examined. The model was calibrated for flows in a duct filled with water (i.e. flows without free water surface) and validated against open channel experiments from the literature. Finally, the model was used to simulate real-life high-discharge conditions. Determination of C_d=f(Fr) indicated that the constant value of C_d as defined in the Eurocode 1 standard is not necessarily optimal.

Language:English
Keywords:SPH, DualSPHysics, 3-D model, bridge pier, drag coefficient
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Publication status:Published
Publication version:Version of Record
Year:2025
Number of pages:Str. 29-37
Numbering:Vol. 38, no. 68
PID:20.500.12556/RUL-171325 This link opens in a new window
UDC:556.166:624.074.1(078.9
ISSN on article:0352-3551
DOI:10.15292/acta.hydro.2025.03 This link opens in a new window
COBISS.SI-ID:246345219 This link opens in a new window
Publication date in RUL:22.08.2025
Views:245
Downloads:63
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Record is a part of a journal

Title:Acta hydrotechnica
Publisher:Fakulteta za gradbeništvo in geodezijo
ISSN:0352-3551
COBISS.SI-ID:3664386 This link opens in a new window

Licences

License:CC BY-NC-SA 4.0, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
Link:http://creativecommons.org/licenses/by-nc-sa/4.0/
Description:A Creative Commons license that bans commercial use and requires the user to release any modified works under this license.

Secondary language

Language:Slovenian
Title:3D simulacije obtekanja valjastega mostnega opornika za določitev koeficienta upora v odvisnosti od Froudovega števila
Abstract:
Vse pogostejše poplave izpostavljajo ranljivost mostov in mostnih opornikov. Pri dimenzioniranju mostnih opornikov je treba upoštevati njihov koeficient upora C_d. V večini virov je ta podan v odvisnosti od Reynoldsovega števila, tj. C_d=f(Re), ta raziskava pa je obravnavala tudi C_d v odvisnosti od Froudovega števila. Z uporabo metode SPH in modela DualSPHysics so bile izvedene tridimenzionalne simulacije turbulentnega toka s prosto gladino, ki nastopa pri obtekanju valjastega mostnega opornika v ravnem horizontalnem kanalu. Širok razpon pretokov je zajel primere mirnega, kritičnega in deročega toka s Froudovimi števili Fr<2. Model je bil umerjen na primere toka v pokritih kanalih brez proste gladine in nato validiran z eksperimenti na odprtem kanalu iz literature. Nazadnje je bil uporabljen za simulacije realističnih visokovodnih dogodkov. Določitev C_d=f(Fr) je pokazala, da konstantna vrednost C_d, ki jo predpisuje standard Eurocode 1, ni nujno optimalna.

Keywords:SPH, DualSPHysics, 3D-model, mostni opornik, koeficient upora

Projects

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P2-0180
Name:Vodarstvo in geotehnika: orodja in metode za analize in simulacije procesov ter razvoj tehnologij

Funder:MCIN/AEI/ 10.13039/5
Project number:CNS2022-136073

Funder:MCIN/AEI/10.13039/50
Project number:RYC2022-038341-I

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