Journal
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
Volume 74, Issue -, Pages 351-362Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.euromechflu.2018.09.009
Keywords
Two-dimensional bluff bodies; Flow separation control; Drag reduction; Contoured grooves
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The effectiveness of properly contoured transverse grooves in delaying the flow separation occurring on a two-dimensional boat-tailed bluff body is assessed through numerical simulations. The body has a cross-section with a 3:1 elliptical forebody and a rectangular main part followed by a circular-arc boat tail. Three-dimensional Variational Multiscale Large Eddy Simulations are carried out at Re = Du(infinity)/nu = 9.6 x 10(4), using a mixed finite-volume/finite-element method. The introduction of one contoured groove on each of the boat-tail lateral surfaces produces a significant delay of flow separation and a consequent increase of the base pressure, with a global drag reduction of the order of 9.7%. The wake dynamical structure remains qualitatively similar to the one typical of blunt-based two-dimensional bodies, with quantitative variations that are consistent with the reduction in wake width caused by boat tailing and by the grooves. The introduction of the grooves leads also to a regularization of the vortex shedding downstream of the body, which is more correlated in the spanwise direction. Finally, a few supplementary simulations show that the effect of the grooves is also robust to the variation of the geometrical parameters defining their location and shape. (C) 2018 Elsevier Masson SAS. All rights reserved.
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