Three-dimensional numerical simulation of the wake flow of an afterbody at subsonic speeds

Bohorquez, Patricio; Parras, Luis

doi:10.1007/s00162-011-0251-9

Cited by 8 publications

(5 citation statements)

References 35 publications

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“…In the present study, peristaltic oscillation or kinking of two trails of counter-rotating vortices is observed prior to a Hopf bifurcation (figures 3a and 3b). Similar behaviour is reported for the case of a sphere (Thompson et al 2001;Schouveiler & Provansal 2002;Gumowski et al 2008), for a disk of low aspect ratio (Shenoy & Kleinstreuer 2008;Szaltys et al 2012;Bobinski et al 2014) and behind an afterbody (Bohorquez & Parras 2013). However, it should be noted that Shenoy & Kleinstreuer (2008) observed that the kinking is accompanied by periodic rotation in disks.…”

Section: Flow Regimessupporting

confidence: 79%

Experimental investigation of flow behind a cube for moderate Reynolds numbers

et al. 2014

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The wake behind a cube with a face normal to the flow was investigated experimentally in a water tunnel using laser induced fluorescence (LIF) visualisation and particle image velocimetry (PIV) techniques. Measurements were carried out for moderate Reynolds numbers between 100 and 400 and in this range a sequence of two flow bifurcations was confirmed. Values for both onsets were determined in the framework of Landau's instability model. The measured longitudinal vorticity was separated into three components corresponding to each of the identified regimes. It was shown that the vorticity associated with a basic flow regime originates from corners of the bluff body, in contrast to the two other contributions which are related to instability effects. The present experimental results are compared with numerical simulation carried out earlier by Saha (Phys.

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Section: Flow Regimessupporting

confidence: 79%

Experimental investigation of flow behind a cube for moderate Reynolds numbers

et al. 2014

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“…The unsteady flow deriving from the DNS at Re d = 1500 is again characterized by the formation and evolution of hairpin vortices (see e.g. Sevilla and Martinez-Bazan, 2004;Barkley, 2006;Bohorquez and Parras, 2011;Bury and Jardin, 2012), as can be qualitatively seen, for instance, from the instantaneous isosurfaces of the vortex-indicator λ 2 shown in Fig. 8.…”

Section: Validation Of the Dns Computational Set Upmentioning

confidence: 81%

“…In particular, a comparison was carried out against results available in the literature for the same type of bodies at low Reynolds numbers (see e.g. Bohorquez and Parras, 2011;Bury and Jardin, 2012).…”

Section: Validation Of the Dns Computational Set Upmentioning

confidence: 99%

“…For axisymmetric bodies this dynamics is more complex than the one characterizing two-dimensional bodies, which is dominated by the von-Karman vortex street. In particular, as the Reynolds number increases the wake undergoes several transitions associated with different wake regimes (see, e.g., Sevilla and Martinez-Bazan, 2004;Barkley, 2006;Bohorquez and Parras, 2011;Bury and Jardin, 2012 for elongated axisymmetric bodies and Miau et al, 1997;Johnson and Patel, 1999;Mittal and Najjar, 1999;Kiya et al, 2001 for spheres and disks). Another advantage of numerical simulation is that the flow conditions are easier to be controlled than in experiments, and the effects of a given parameter may thus be sin-gled out.…”

Section: Introductionmentioning

confidence: 99%

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Connection between base drag, separating boundary layer characteristics and wake mean recirculation length of an axisymmetric blunt-based body

Mariotti

Buresti

Salvetti

2015

Journal of Fluids and Structures

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“…Table 1 summarizes the numerical simulations performed. High-quality results over axisymmetric bodies related to linear stability analysis using this code have been recently reported [29,30,36,37].…”

Section: A Numerical Simulationsmentioning

confidence: 91%

Formation of Three-Dimensional Structures in the Hemisphere-Cylinder

et al. 2016

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This paper presents an investigation of the origin and evolution of the complex flow pattern on a hemisphere-cylinder at separated flow conditions. Three-dimensional numerical simulations have been performed for a range of Reynolds numbers and angles of attack. A critical point theory has been used to analyze the flowfields. This has yielded, for the first time for this geometry, a bifurcation diagram that classifies the different flow topology regimes as a function of the Reynolds number and angle of attack. A complete characterization of the origin and evolution of the complex structural patterns of this geometry is documented. For the higher Reynolds number and angle of attack, a structurally stable topology is found that is associated with the pattern of the horn vortices, usually found on this geometry in a range from low to high Reynolds numbers and from incompressible to compressible regimes. Surface critical points and surface and volume streamlines describe the main flow structures and their strong dependence with the flow conditions.

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Three-dimensional numerical simulation of the wake flow of an afterbody at subsonic speeds

Cited by 8 publications

References 35 publications

Experimental investigation of flow behind a cube for moderate Reynolds numbers

Experimental investigation of flow behind a cube for moderate Reynolds numbers

Connection between base drag, separating boundary layer characteristics and wake mean recirculation length of an axisymmetric blunt-based body

Formation of Three-Dimensional Structures in the Hemisphere-Cylinder

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