Three-dimensional centrifugal instabilities development inside a parallelepipedic open cavity of various shape

Faure, Thierry; Pastur, Luc; Lusseyran, François; Fraigneau, Yann; Bisch, D.

doi:10.1007/s00348-009-0671-0

Cited by 47 publications

(60 citation statements)

References 23 publications

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“…The present results share some similarity with the structure observed in Faure et al (2006) and Faure et al (2009), in a square open cavity with large aspect ratio at Reynolds numbers between 40000 and 90000, as the wavelength was about half the cavity size, although the flow in those experiments was laminar or transitional and not highly turbulent as in the present case. In the present experiments the three dimensional character of the flow is stronger near the end walls, and seems to loose strength towards the centre.…”

Section: Flow Visualisationssupporting

confidence: 77%

Flow regimes in a trapped vortex cell

Lasagna

Iuso

2016

Exp Fluids

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This paper presents results of an experimental investigation on the flow in a trapped vortex cell embedded into a flat plate and interacting with a zeropressure-gradient boundary layer. The objective of the work is to describe the flow features and elucidate some of the governing physical mechanisms, in light of recent investigations on flow separation control using vortex cells. Hot-wire velocity measurements of the shear layer bounding the cell and of the boundary layers upstream and downstream are reported, together with spectral and correlation analyses of wall-pressure fluctuation measurements. Smoke flow visualisations are reported to provide qualitative insight into some relevant features of the internal flow, namely a large-scale flow unsteadiness and possible mechanisms driving the rotation of the vortex core. Results are presented for two very different regimes: a low Reynolds number case where the incoming boundary layer is laminar and its momentum thickness is small compared to the cell opening, and a moderately high Reynolds number case, where the incoming boundary layer is turbulent and the ratio between the momentum thickness and the opening length is significantly larger than in the first case. Implications of the present findings to flow control application of trapped vortex cells are also discussed.

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Section: Flow Visualisationssupporting

confidence: 77%

Flow regimes in a trapped vortex cell

Lasagna

Iuso

2016

Exp Fluids

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“…Recently, Faure et al (2009) aimed to understand the three-dimensional flow morphology by varying the Reynolds number and the cavity shape. Basley et al (2011) used time-resolved particle image velocimetry (PIV) to extract the spatial distribution of the most characteristic frequencies in the incompressible open cavity with two different aspect ratios, and also identified once again the presence of the aforementioned shear-layer modes in the incompressible regime.…”

Section: Introductionmentioning

confidence: 99%

On linear instability mechanisms in incompressible open cavity flow

et al. 2014

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A theoretical study of linear global instability of incompressible flow over a rectangular spanwise-periodic open cavity in an unconfined domain is presented.Comparisons with the limited number of results available in the literature are shown. Subsequently, the parameter space is scanned in a systematic manner, varying Reynolds number, incoming boundary-layer thickness and length-to-depth aspect ratio. This permits documenting the neutral curves and leading eigenmode characteristics of this flow. Correlations constructed using the results obtained collapse all available theoretical data on the three-dimensional instabilities.

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“…The maximum turbulence intensity in the external flow is less 1 %. The Reynolds number Re D is built on the cavity depth D. It has been shown that this Reynolds number is relevant for the internal cavity flow description (Brès and Colonius 2008;Faure et al 2009). PIV measurements are conducted with a pulsed YAG laser emitting a 0.25-mm-thick light sheet at 532 nm with energy of 250 mJ per pulse.…”

Section: Experimental Set-up and Apparatusmentioning

confidence: 99%

“…The experimental facility is a low-speed open-circuit wind tunnel (Faure et al 2007(Faure et al , 2009Basley et al 2011;Douay et al 2013). The cavity dimensions (length L, depth D and span S) can vary, and different aspect ratios L/D between 0.5 and 2 are investigated.…”

Section: Experimental Set-up and Apparatusmentioning

confidence: 99%

Velocity field and parametric analysis of a subsonic, medium-Reynolds number cavity flow

Faure

2014

Exp Fluids

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Cavity flows are a class of flows bounded by material structures, where a recirculation region is present, and they are found in many practical applications. In the present study, the interaction between a boundary layer and an open parallelepipedic cavity develops a Kelvin-Helmholtz-like instability coupled with the cavity recirculation. PIV measurements of the flow are carried out in two orthogonal planes inside the cavity, for different aspect ratios, incompressible flow conditions, and Reynolds numbers in the range 1,900-12,000. Mean velocity and secondorder moments of velocity fluctuations reveal the flow morphology. For particular conditions, centrifugal instabilities appear that are induced by flow curvature due to wall confinement. The use of an identification criterion indicates the presence of pairs of counter-rotating vortices winded around the recirculation. A parametric analysis is conducted, and the inviscid Rayleigh discriminant provides the potentially unstable flow regions inside the cavity. Finally, a stability parameter considering the ratio between centrifugal destabilizing effects and stabilizing viscous effects is carried out and gives thresholds for the emergence of the centrifugal instability. The study draws to an end with a comparison with a well-documented lid-driven cavity flow.

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Three-dimensional centrifugal instabilities development inside a parallelepipedic open cavity of various shape

Cited by 47 publications

References 23 publications

Flow regimes in a trapped vortex cell

Flow regimes in a trapped vortex cell

On linear instability mechanisms in incompressible open cavity flow

Velocity field and parametric analysis of a subsonic, medium-Reynolds number cavity flow

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