20.500.12556/DiRROS-21913 Experimental and numerical study of Taylor bubble in counter-current turbulent flow The stagnant Taylor bubble in vertical isothermal turbulent counter-current flow was analyzed using 2D shadowgraphy experiments and two distinct high-fidelity numerical simulations. One simulation employed the geometrical VOF interface tracking method within the OpenFOAM code, while the other utilized the explicit front tracking method of the TrioCFD code. Interface recognition algorithms were applied to the photographs and compared with the results of 3D simulations performed with LES and pseudo-DNS accuracy in OpenFOAM and TrioCFD, respectively. The measured Taylor bubbles exhibited an asymmetric bullet-train shape and a specific speed, which were compared with the predictions of both numerical approaches. Reproducing the experiment proved challenging for both otherwise well-established methods frequently used in interface tracking simulations of two-phase flows. Grid resolution and subgrid turbulent models, known for their success in single-phase turbulence, were less accurate near the water–air interface. Additional experimental parameters compared with simulations were related to the dynamics of tiny disturbance waves with amplitudes ranging from 10 to 100 µm along the interface of the Taylor bubbles. The speed and spectra of the surface disturbance waves were reproduced numerically with moderate success despite detailed grid refinement in the relevant region of the computational domain. gas–liquid mixture flows slug flow Taylor bubble shadowgraphy front tracking Taylorjev mehur true false true Springer Nature Švica Angleški jezik Slovenski jezik © The Author(s) 2024 Neznano 2025-04-10 13:24:00 2025-04-10 13:24:01 2025-10-24 03:50:10 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Soavtorja iz Slovenije: Jan Kren, Blaž Mikuž; Opis vira z dne 21. 8. 2024; str. 3417-3434 iss. 6 Vol. 50 Mar. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-03-11 2024-07-28 2024-08-21 53 2191-4281 10.1007/s13369-024-09489-2 204864771 https://link.springer.com/article/10.1007/s13369-024-09489-2?utm_source=rct_congratemailt&utm_medium=email&utm_campaign=oa_20240821&utm_content=10.1007%2Fs13369-024-09489-2#Abs1 1 4e8512ee-15fe-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31607 RAZ_Tiselj_Iztok_2025.pdf RAZ_Tiselj_Iztok_2025.pdf 1 E119BD162BD87C1939D21D5EF97B07A8 31143b0bd1b96c21d130740e000e749491ccfe89a1927627669356a17655bb2a b2bed95e-15fe-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31608 Institut Jožef Stefan 0 0 0