Investigation of vortex shedding from an airfoil by CFD simulation and computer-aided flow visualization

Novak, Lovrenc (avtor), Bajcar, Tom (avtor), Širok, Brane (avtor), Orbanić, Alen (avtor), Bizjan, Benjamin (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: CFD, flow visualization, airfoil aerodynamics, vortex street, scale adaptive simulation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2018
• Št. strani: Str. 3023-3033
• Številčenje: Vol. 22, iss. 6B
• PID: 20.500.12556/RUL-126380
• UDK: 532:629.7:533.6.04:519.61/.64(045)
• ISSN pri članku: 0354-9836
• DOI: 10.2298/TSCI170615002N
• COBISS.SI-ID: 15955995
• Datum objave v RUL: 19.04.2021

Gradivo je del revije

• Naslov: Thermal science
• Skrajšan naslov: Therm. sci.
• Založnik: Vinča Institute of Nuclear Sciences
• ISSN: 0354-9836
• COBISS.SI-ID: 43417089

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
• Začetek licenciranja: 19.04.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: računalniška dinamika tekočin, vizualizacija toka, aerodinamika krila, vrtinčna steza, SAS model turbulence