20.500.12556/ReVIS-12559 Numerical prediction of the NPSH characteristics in centrifugal pumps This study focuses on the numerical analysis of a centrifugal pump’s suction capability, aiming to reliably predict its suction performance characteristics. The main emphasis of the research was placed on the influence of different turbulence models, the quality of the computational mesh, and the comparison between steady-state and unsteady numerical approaches. The results indicate that steady-state simulations provide an unreliable description of cavitation development, especially at lower flow rates where strong local pressure fluctuations are present. The unsteady k–ω SST model provides the best overall agreement with experimental NPSH3 characteristics, as confirmed by the lowest mean deviation (within the ISO 9906 tolerance band, corresponding to an overall uncertainty of ±5.5%) and by multiple operating points falling entirely within this range. This represents one of the first detailed unsteady CFD verifications of NPSH prediction in centrifugal pumps operating at high rotational speeds (above 2900 rpm), achieving a mean deviation below ±5.5% and demonstrating improved predictive capability compared to conventional steady-state approaches. The analysis also includes an evaluation of the cavitation volume fraction and a depiction of pressure conditions on the impeller as functions of flow rate and inlet pressure. In conclusion, this study highlights the potential of advanced hybrid turbulence models (such as SAS or DES) as a promising direction for future research, which could further improve the prediction of complex cavitation phenomena in centrifugal pumps. neto pozitivna sesalna višina modeliranje turbulence nestacionarne simulacije delovanje črpalke true false false Angleški jezik Slovenski jezik Članek v reviji 2025-11-12 14:14:37 2025-11-12 14:14:37 2025-11-13 03:07:27 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Opis vira z dne 12. 11. 2025; str. 1-27 iss. 10, [art. no.] 274 Vol. 10 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2025-01-01 621.67:620.193.16 2311-5521 256932099 10.3390/fluids10100274 https://www.mdpi.com/2311-5521/10/10/274 1 8abc86fe-bfc9-11f0-94a7-001a4af901a5 https://revis.openscience.si/Dokument.php?lang=slv&id=14730 RAZ_Stefanic_Matej_2025.pdf RAZ_Stefanic_Matej_2025.pdf 1 EA6233E775E85853C8EC2DD9E2177552 f7791d063e2ff23ac41394a3986bbcb5b764fa56980418b117882936c770767a b4fb1d73-bfc9-11f0-94a7-001a4af901a5 https://revis.openscience.si/Dokument.php?lang=slv&id=14731 Univerza v Novem mestu - Fakulteta za strojništvo 0 0 0