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Effects of Heaving Motion on the Aerodynamic Performance of a Double-Element Wing in Ground Effect

Fluid Dynamics & Materials Processing 2020年第6期16卷 31-52页

作者： ioannis oxyzoglou Zheng-Tong Xie Faculty of Engineering and Physical Sciences University of SouthamptonSouthamptonSO171BJUK

The broad implication of the paper is to elucidate the significance of the dynamic heaving motion in the aerodynamic performance of multi-element wings,currently considered as a promising aspect for the improvement of the aerodynamic correlation between CFD,wind tunnel and track testing in race car *** relationship between the varying aerodynamic forces,the vortex shedding,and the unsteady pressure field of a heaving double-element wing is investigated for a range of mean ride heights,frequencies,and amplitudes,using a two-dimensional(2D)unsteady Reynolds-averaged Navier-Stokes(URANS)approach and an overset mesh method for modelling the moving *** analysis of the results shows that at high frequencies,i.e.,k≥5.94 and amplitudes a/c≥0.05 the interaction of the shear vorticity between the two elements results in the generation of cohering leading and trailing edge vortices on the flap,associated to the rapid variation of thrust and downforce *** the occurrence and intensity of these vortices are dependent upon the frequency,amplitude,and mean ride height of the heaving *** addition of the flap significantly alters the frequency of the shed vortices in the wake and maintains the generation of downforce for longer time in ground *** comparison with the static wing provides evidence that the dynamic motion of a race car wing can be beneficial in terms of performance,or detrimental in terms of aerodynamic correlation.

关键词： CFD URANS aerodynamics heaving wing multi-element wing vortex shedding ground effect downforce overset mesh race car

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