20.500.12556/RUL-187745 Simulacija turbulentnega toka hladila v povratnem kanalu sredice tlačnovodnega reaktorja z uporabo hibridne RANS/LES metode Simulation of turbulent coolant flow in the downcomer of the PWR reactor core using hybrid RANS-LES approach Cilj magistrske naloge je numerično simuliranje in analiza turbulentnega toka hladila v povratnem kanalu sredice tlačnovodnega reaktorja Nuklearne elektrarne Krško. Hladilo vstopa v povratni kanal skozi dva ločena vhoda, zato naloga obravnava tako simetrične kot tudi rahlo asimetrične obratovalne pogoje pretoka. Del pozornosti bomo namenili analizi toka v območju cevi za varnostno vbrizgavanje (t. i. SI-cev, angl. safety injection pipe), kjer obstoječe temperaturne meritve nakazujejo možnost pojava nestabilnega toka oziroma nizkofrekvenčnih fluktuacij hladila. Namen analize je podrobno preučiti lokalno hidrodinamiko toka v območju priključka. The objective of this work is the numerical simulation and analysis of the turbulent coolant flow in the downcomer of the Krško Nuclear Power Plant. The coolant enters the downcomer through two separate inlets; therefore, the study addresses both symmetric and slightly asymmetric flow operating conditions. Part of the focus will be dedicated to analyzing the flow in the region of the safety injection pipe, where existing temperature measurements suggest the potential occurrence of unstable flow fluctuations. The purpose of the analysis is to investigate the local flow hydrodynamics in this area and to identify potential characteristic flow structures that could be linked to the observed fluctuations. Računska dinamika tekočin hibridna metoda RANS/LES turbulentni tok enofazni tok OpenFOAM Computational fluid dynamics hybrid RANS/LES method turbulent flow singlephase flow OpenFOAM true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-09-13 08:15:27 2026-09-13 08:15:29 2026-09-16 16:42:04 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 163711 291347715 23957.pdf 23957.pdf 1 00398B5071D1C8731F2017E82D7A39E9 fa9ec19d4b14e709096804e3fe3c62ae12b8ac7c81f8fda9aaa62bacf7291eb6 7ecb40f2-af3a-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=247487 Fakulteta za matematiko in fiziko 0 0 0