Interactions of the wakes of two spheres placed side by side

Schouveiler, Lionel; Brydon, Andrew; Leweke, Thomas; Thompson, Mark C.

doi:10.1016/j.euromechflu.2003.05.004

Cited by 57 publications

(24 citation statements)

References 17 publications

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“…For a single sphere in a uniform flow, when the Reynolds number reaches around 280 and below 360, the plane symmetric hairpin shaped vortices are shed periodically behind the sphere. The orientation of the symmetric plane is arbitrary [29].…”

Section: Flow Past Two Spheres Placed Side By Sidementioning

confidence: 99%

A LBM–DLM/FD method for 3D fluid–structure interactions

Shi

Lim

2007

Journal of Computational Physics

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Section: Flow Past Two Spheres Placed Side By Sidementioning

confidence: 99%

A LBM–DLM/FD method for 3D fluid–structure interactions

Shi

Lim

2007

Journal of Computational Physics

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“…In early 1980s, some qualitative experimental results for ow past two or three spheres were achieved by Tsuji et al [6]. The latest experimental study about wakes of two spheres placed side-by-side was done by Schouveiler et al [7] and distinctly di erent regimes of interactions were observed, depending on the gap between two spheres.…”

Section: Introductionmentioning

confidence: 97%

Study on flow past two spheres in tandem arrangement using a local mesh refinement virtual boundary method

Zou

Ren

Deng

2005

Int. J. Numer. Meth. Fluids

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SUMMARYA local mesh reÿnement virtual boundary method based on a uniform grid is designed to study the transition between the ow patterns of two spheres in tandem arrangement for Re = 250. For a small gap (L=D = 1:5), the ow ÿeld is axisymmetric. As the spacing ratio increases to 2.0, the pressure gradient induces the circumferential uid motion and a plane-symmetric ow is constructed through a regular bifurcation. For L=D ¿ 2:5, the vortices are periodically shed from the right sphere, but the planar symmetry remains. The case for L=D = 3:0 is picked up to give a detail investigation for the unsteady ow. The shedding frequency of vortical structure from the upper side of the right sphere is found to be double of the frequency of the lower side. With the ow spectra of various gaps given, the underlying competitive mechanism between the two shedding frequencies is studied and a critical spacing gap is revealed.

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“…There are also some experimental works to assess the flow around double sphere arrangements. In another study made by [30] informs about experiments for wake structures of periodic coupled double spheres for Re between 200 and 350. At similar Re numbers, namely at Re 200, flow structure around a leading sphere and a following one was reported [26].…”

Section: Introductionmentioning

confidence: 99%

Wake structures of two side by side spheres in a tripped boundary layer flow

Canlı

Özgören

Doğan

et al. 2014

EPJ Web of Conferences

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Abstract. Two independent spheres were placed in a side by side arrangement and flow structure in the wake region of the spheres was investigated with a Particle Image Velocimetry (PIV) system when the spheres were in a boundary layer over a flat plate as a special case. Reynolds number was 5000 based on the sphere diameter which was 42.5 mm. Boundary layer was tripped 8mm away from the leading edge of the flat plate with a 5 mm trip wire. The thickness of the hydrodynamically developed boundary layer was determined as 63mm which was larger than the sphere diameter of D=42.5mm. Wake region of the spheres was examined from point of flow physics for the different sphere locations in the ranges of 0G/D 1.5 and 0S/D 1.5 where G and S were the distance between the spheres and the distance between the bottom point of the spheres and the flat plate surface, respectively. Depending on the different sphere locations, instantaneous and time averaged vorticity data, scalar values of time-averaged velocity components and their root mean square (rms) values and time averaged vorticity data are presented in the study for the evaluation of wake region of the spheres. It is demonstrated that the gap between the two spheres and the interaction between the gap and the boundary layer greatly affects flow pattern, especially when spheres are located near to the flat plate surface, i.e. S/D=0.1 for 0G/D 1.5. Different distances between the spheres resulted in various flow patterns as the spheres were approached to the flat plate. The distance S/D=0.1 for all gap values has the strongest effect on the wake structures. Beyond G/D=1.0, the sphere wakes tend to be similar to single sphere case. The instantaneous vorticity fields of the side by side arrangements comprised wavy structures in higher level comparing to an individual sphere case. The gap flow intensifies the occurrence of small scale eddies in the wake region. The submersion rate of the spheres actually determines the characteristics of the wake region and is affected from boundary layer flow in a gradually decreasing manner.

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Interactions of the wakes of two spheres placed side by side

Cited by 57 publications

References 17 publications

A LBM–DLM/FD method for 3D fluid–structure interactions

A LBM–DLM/FD method for 3D fluid–structure interactions

Study on flow past two spheres in tandem arrangement using a local mesh refinement virtual boundary method

Wake structures of two side by side spheres in a tripped boundary layer flow

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