20.500.12556/RUL-126380 Investigation of vortex shedding from an airfoil by CFD simulation and computer-aided flow visualization The article presents an experimental and numerical study of vortex generation and shedding from a NACA 4421 airfoil at low Reynolds number. The experiment was conducted in a low-speed wind tunnel by flow visualization. A high-speed camera was used to record flow structures at the airfoil trailing edge. The recorded images were processed with an in-house developed software based on the advection-diffusion equation to compute instantaneous 2D velocity fields. These results were compared with results of the CFD simulation which employed the scale-adaptive simulation (SAS) turbulence modelling. The SST-SAS model produced finer and less stable turbulent structures compared to an URANS simulation with the SST model. Time-averaged velocities and frequency spectra for the both models are in good agreement, but variability of flow in both time and frequency domain is higher in case of the SST-SAS model. Velocity fields computed on the basis of visualization show generally acceptable agreement with the CFD results. Higher errors occur in areas of unperturbed smoke trails and areas of high velocity gradients, however, the vortex shedding frequency is captured with excellent agreement to the experiment. CFD flow visualization airfoil aerodynamics vortex street scale adaptive simulation računalniška dinamika tekočin vizualizacija toka aerodinamika krila vrtinčna steza SAS model turbulence true false true Angleški jezik Slovenski jezik Članek v reviji 2021-04-19 15:25:49 2021-04-19 15:25:54 2022-09-05 03:54:59 0000-00-00 00:00:00 2018 0 0 Str. 3023-3033 iss. 6B Vol. 22 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532:629.7:533.6.04:519.61/.64(045) 0354-9836 10.2298/TSCI170615002N 15955995 43417089 RAZ_Novak_Lovrenc_2018.pdf RAZ_Novak_Lovrenc_2018.pdf 1 0CECF931686D56C9BF274A589BC1C197 500f42a6c653aff8dfc6cf29e000c23aca1cb59d15c3318331d9ff63827edb0f e5be46ee-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142311 http://thermalscience.vinca.rs/online-first/2732 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142310 Fakulteta za strojništvo 0 0 0