Unsteady RANS simulations of strong and weak 3D stall cells on a 2D pitching aerofoil

dc.contributor.authorLiu, Dajun
dc.contributor.authorNishino, Takafumi
dc.date.accessioned2019-04-29T14:57:33Z
dc.date.available2019-04-29T14:57:33Z
dc.date.issued2019-03-02
dc.description.abstractA series of three-dimensional unsteady Reynolds-averaged Navier–Stokes (RANS) simulations are conducted to investigate the formation of stall cells over a pitching NACA 0012 aerofoil. Periodic boundary conditions are applied to the spanwise ends of the computational domain. Several different pitching ranges and frequencies are adopted. The influence of the pitching range and frequency on the lift coefficient (CL) hysteresis loop and the development of leading-edge vortex (LEV) agrees with earlier studies in the literature. Depending on pitching range and frequency, the flow structures on the suction side of the aerofoil can be categorized into three types: (i) strong oscillatory stall cells resembling what are often observed on a static aerofoil; (ii) weak stall cells which are smaller in size and less oscillatory; and (iii) no stall cells at all (i.e., flow remains two-dimensional) or only very weak oval-shaped structures that have little impact on CL. A clear difference in CL during the flow reattachment stage is observed between the cases with strong stall cells and with weak stall cells. For the cases with strong stall cells, arch-shaped flow structures are observed above the aerofoil. They resemble the Π-shaped vortices often observed over a pitching finite aspect ratio wing.en_UK
dc.identifier.citationDajun Liu and Takafumi Nishino. Unsteady RANS simulations of strong and weak 3D stall cells on a 2D pitching aerofoil. Fluids, 2019, Volume 4, Issue 1, Article number 40en_UK
dc.identifier.issn2311-5521
dc.identifier.urihttps://doi.org/10.3390/fluids4010040
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14119
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectpitching aerofoilen_UK
dc.subjectunsteady RANSen_UK
dc.subjecthysteresis loopen_UK
dc.subjectleading-edge vortexen_UK
dc.subjectstall cellsen_UK
dc.titleUnsteady RANS simulations of strong and weak 3D stall cells on a 2D pitching aerofoilen_UK
dc.typeArticleen_UK

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