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Parametric analysis of a complex flow : a mixing layer-wake interaction

Abstract : The flow studied is a cross interaction from two canonical flows, a wake and a mixing layer, realized for the first time by Heitz(1999) for a particular configuration (Reynolds number 7, 500, aspect ratio 18, shear parameter 0.42). He found that the difference of velocity between two sides of the mixing layer gives rise to a pressure gradient along the cylinder responsible for a secondary flow from the low to high velocity side in the near wake. As a consequence the suction coefficient (Cp), the frequency distribution (f) and the vortex length formation (Lf) are locally greatly modified if we compare them to uniform flow. Nevertheless, the aspect ratio, according to Norberg (1994), and the shear parameter (in uniform shear wake: 0.02) are control parameters of great importance for the shedding organization in the near wake. In order to investigate the influence of those control parameters (Reynolds numbers, two aspects ratio and five shear parameters) hot wire and pressure measurement have been carried out. We mainly found that even if the magnitude of the mean characteristic parameters is locally strongly perturbated along the cylinder, the resulting wake keeps its general behavior.
Keywords : ECOULEMENT CISAILLE
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Conference papers
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https://hal.inrae.fr/hal-02583858
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Submitted on : Thursday, May 14, 2020 - 10:43:24 PM
Last modification on : Thursday, April 8, 2021 - 10:02:05 AM

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  • HAL Id : hal-02583858, version 1
  • IRSTEA : PUB00015842

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C. Braud, Dominique Heitz. Parametric analysis of a complex flow : a mixing layer-wake interaction. 57th annual meeting of the division of fluid dynamics, APS Meeting ID : DFD04, Seattle, Washington, USA, 21-23 Novembre 2004, 2004. ⟨hal-02583858⟩

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