Turbulent shear flow downstream of a sphere with and without an o-ring located over a plane boundary

Flow structure in the wake of a low-aspect-ratio wall-mounted bluff body

“…This observation is quite similar to results of Ozgoren et al (2012Ozgoren et al ( , 2013 The streamwise vorticity distribution in the wake of the sphere at x/D =0.5…”

“…While most investigations of the flow structure generated by wall-mounted obstacles have focused on circular cylinders and prisms, as suggested by the collection of literature described above, other geometries have been investigated. These include hemispheres and spheres (Okamoto, 1980;Toy, 1986, 1988;Shamloo et al, 2001;Tsutsui, 2008;Papanicolaou et al, 2011;Ozgoren et al, 2012;Papanicolaou et al, 2012a), tapered plates, pyramids and cones (Vosper et al, 1999;Castro et al, 2001;Martinuzzi and AbuOmar, 2003;AbuOmar and Martinuzzi, 2008;Martinuzzi, 2008), and modified cylinders and prisms Toy, 1986, 1988;Leder, 2003;Sousa and Pereira, 2004). A few studies have also investigated on flow structure around an axisymmetric hill (Simpson et al, 2002;Byun and Simpson, 2006;Krajnović, 2008).…”

“…Only a few studies have been considered and spherical bodies on boundary layer flow (Okamoto, 1980;Tsutsui, 2008;Ozgoren et al, 2012). The flow structure around sphere in the unbounded flow conditions has been studied extensively, either experimentally or numerically.…”

“…The horseshoe vortex was observed at x/D = 2 and 4 by Okamoto (1980) for circular cylinder of AR = 1, resulting from the combination of tip structures and horseshoe legs near the ground plane, this observation was not reported by Okamoto (1980) in the wake of sphere. Similar investigation on a sphere with varying gap on a flat plate was also conducted using PIV and dye visualization by Ozgoren et al (2012) at Re D = 5000 and thick boundary layer of δ/D = 1.58 to determine the flow-structure interaction with the plate boundary. Their results enhanced understanding of flow pattern in the streamwised symmetry plane which will be compared to results of this study in The experimental study of Taneda (1978) by means of smoke-wire and the surface oil-flow method revealed a vortex skeleton model for a sphere supported by steel rod at the rear in the super critical regime (3.8 × 10 5 < Re < 10 6 ).…”

“…23: Flow visualization of flow structure with laser illumination of Rhodamine dye injection technique around the smooth sphere at Re D = 5000(Ozgoren et al, 2012) …”