20.500.12556/DKUM-98265 Primerjalna analiza numerične natančnosti med programskima paketoma OpenFOAM in ANSYS Fluent na izbranih referenčnih tokovnih primerih magistrsko delo Comparative analysis of numerical accuracy between OpenFOAM and ANSYS Fluent on selected benchmark flow cases V magistrskem delu je izvedena primerjalna analiza programskih paketov OpenFOAM in ANSYS Fluent na treh referenčnih primerih računalniške dinamike tekočin. Obravnavani so turbulentni tok za stopnico, tok okoli Potsdamskega propelerja ter večfazni tok pri tridimenzionalni porušitvi pregrade. V teoretičnem delu so predstavljene osnovne enačbe računalniške dinamike tekočin ter uporabljeni numerični modeli – Reynoldsovo povprečene Navier-Stokesove enačbe, metoda vrtečega referenčnega sistema (MRF), metoda volumna tekočine (VoF) in Richardsonova ekstrapolacija za analizo mrežne konvergence. Za vsak referenčni primer je bila izdelana geometrija računskega območja, definirani robni pogoji in pripravljena računska mreža. Simulacije so bile izvedene z obema programskima paketoma, rezultati pa primerjani z eksperimentalnimi oziroma referenčnimi podatki iz literature. Rezultati raziskave so pokazali, da oba programska paketa pri ustrezno izbranih nastavitvah dosegata primerljivo natančnost rezultatov. Analiza računske učinkovitosti je pokazala, da je ANSYS Fluent učinkovitejši pri izvajanju posameznih simulacij, predvsem pri 2D turbulentnem toku, medtem ko OpenFOAM omogoča učinkovitejše izvajanje več simulacij hkrati in je bil pri večfaznem primeru računsko hitrejši. Ugotovljeno je bilo tudi, da ANSYS Fluent praviloma omogoča stabilnejšo in robustnejšo konvergenco. Na podlagi rezultatov smo ugotovili, da sta oba programska paketa primerna za reševanje zahtevnih problemov računalniške dinamike tekočin. ANSYS Fluent izkazuje prednosti predvsem pri robustnosti in enostavnosti uporabe, OpenFOAM pa predstavlja zmogljivo odprtokodno alternativo, ki lahko ob ustreznih nastavitvah doseže primerljivo ali celo boljšo natančnost rezultatov. A comparative analysis of the OpenFOAM and ANSYS Fluent software packages was conducted in this master’s thesis using three benchmark cases in computational fluid dynamics. The investigated cases include turbulent flow over a backward-facing step, flow around the Potsdam propeller, and multiphase flow during three-dimensional dam break. The theoretical part presents the fundamental equations of computational fluid dynamics and the numerical models used in the study – the Reynolds-averaged Navier–Stokes equations, the Multiple Reference Frame (MRF) method, the Volume of Fluid (VoF) method, and Richardson extrapolation for grid convergence analysis. For each benchmark case, the computational domain geometry was created, boundary conditions were defined, and the computational mesh was prepared. Simulations were performed with both software packages, and the results were compared with experimental and reference data from the literature. The results of the study showed that both software packages achieve comparable accuracy when appropriate numerical settings are used. Computational efficiency analysis demonstrated that ANSYS Fluent is more efficient for executing individual simulations, particularly in the case of two-dimensional turbulent flow, whereas OpenFOAM enables more efficient execution of multiple simulations simultaneously and was computationally faster in the multiphase case. It was also found that ANSYS Fluent generally provides more stable and robust convergence. Based on the results obtained, it was concluded that both software packages are suitable for solving demanding computational fluid dynamics problems. ANSYS Fluent demonstrates advantages mainly in terms of robustness and ease of use, while OpenFOAM represents a powerful open-source alternative capable of achieving comparable or even better accuracy under appropriate settings. CFD orodja referenčni primer primerjava natančnost učinkovitost CFD tools benchmark case comparison accuracy efficiency true true false [J. Baš] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-05-31 20:34:20 2026-06-30 15:43:44 2026-09-17 03:10:42 0000-00-00 00:00:00 2026 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (IX, 53 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.5:004.4(043.2) 291316227 MAG_Bas_Jaka_2026.pdf MAG_Bas_Jaka_2026.pdf 1 AC82CFBF15E4A7618D4F8C0EEF8BA247 f32aa517f24d48f136fc64757ff7b71a669e98850ebad02706b17e411ee5c9be 49e7b81a-73f1-11f1-a1c0-00155d580e34 https://dk.um.si/Dokument.php?lang=slv&id=207708 Fakulteta za strojništvo 0 0 0