20.500.12556/RUL-171325 3D simulations of flow past a cylindrical bridge pier for determination of drag coefficient as a function of Froude number 3D simulacije obtekanja valjastega mostnega opornika za določitev koeficienta upora v odvisnosti od Froudovega števila 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. 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. SPH DualSPHysics 3-D model bridge pier drag coefficient SPH DualSPHysics 3D-model mostni opornik koeficient upora true false true Angleški jezik Slovenski jezik Članek v reviji 2025-08-22 11:13:15 2025-08-22 11:13:19 2025-08-26 03:38:02 0000-00-00 00:00:00 2025 0 0 Str. 29-37 no. 68 Vol. 38 Jun. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 556.166:624.074.1(078.9 0352-3551 10.15292/acta.hydro.2025.03 246345219 Novak,_Dominguez_Alonso-3D_simulacije_obtekanja_valjastega_mostnega_opornika_za_dolocitev_koeficie.pdf Novak,_Dominguez_Alonso-3D_simulacije_obtekanja_valjastega_mostnega_opornika_za_dolocitev_koeficie.pdf 1 51EC2DDABF9868C3FF63AF375E8E824F 1471297db242982c111a8a8a8faf335dc9ca0bd505f1b637d1dad7c9714d0872 a0f2e812-7f38-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214561 https://actahydrotechnica.fgg.uni-lj.si/si/paper/a38gn 1 23e56d20-7f38-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214557 Fakulteta za gradbeništvo in geodezijo 0 0 0