Wake transition in the flow around a circular cylinder with a splitter plate

Serson, Douglas; Meneghini, Júlio Romano; Carmo, Bruno Souza; Volpe, Ernani; Gioria, Rafael dos Santos

doi:10.1017/jfm.2014.430

Cited by 51 publications

(12 citation statements)

References 20 publications

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“…Serson et al. 2014). Therefore, it is not surprising that the critical Re for the asymmetry of the time-averaged flow coincides with the critical Re for the instability of the subharmonic mode (both at Re = 280–285).…”

Section: Numerical Resultsmentioning

confidence: 98%

Three-dimensional wake transition of a diamond-shaped cylinder

Jiang

2021

J. Fluid Mech.

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Section: Numerical Resultsmentioning

confidence: 98%

Three-dimensional wake transition of a diamond-shaped cylinder

Jiang

2021

J. Fluid Mech.

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“…Such prominent axial flow may prevent the interaction between the free shear layers shed from the two sides of the cylinder and act equivalently to a splitter plate. A recent study on the wake behind a circular cylinder with splitter plate (Serson et al 2014) provides a review of relevant references on this topic. Generally speaking, with a splitter plate appended behind the cylinder, due to the interruption of shear layer interactions, the recirculation region is longer and the shedding frequency is lower.…”

Section: Other Relevant Cylindrical Structuresmentioning

confidence: 99%

Turbulent wake behind a concave curved cylinder

2019

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We present a detailed study of the turbulent wake behind a quarter-ring curved cylinder at Reynolds number $Re=3900$ (based on cylinder diameter and incoming flow velocity), by means of direct numerical simulation. The configuration is referred to as a concave curved cylinder with incoming flow aligned with the plane of curvature and towards the inner face of the cylinder. Wake flows behind this configuration are known to be complex, but have so far only been studied at low $Re$. This is the first direct numerical simulation investigation of the turbulent wake behind the concave configuration, from which we reveal new and interesting wake dynamics, and present in-depth physical interpretations. Similar to the low-$Re$ cases, the turbulent wake behind a concave curved cylinder is a multi-regime and multi-frequency flow. However, in addition to the coexisting flow regimes reported at lower $Re$, we observe a new transitional flow regime at $Re=3900$. The flow field in this transitional regime is dominated not by von Kármán-type vortex shedding, but by periodic asymmetric helical vortices. Such vortex pairs exist also in some other wake flows, but are then non-periodic. Inspections reveal that the periodic motion of the asymmetric helical vortices is induced by vortex shedding in its neighbouring oblique shedding regime. The oblique shedding regime is in turn influenced by the transitional regime, resulting in a unified and remarkably low dominating frequency in both flow regimes. Owing to this synchronized frequency, the new wake dynamics in the transitional regime might easily be overlooked. In the near wake, two distinct peaks are observed in the time-averaged axial velocity distribution along the curved cylinder span, while only one peak was observed at lower $Re$. The presence of the additional peak is ascribed to a strong favourable base pressure gradient along the cylinder span. It is noteworthy that the axially directed base flow exceeded the incoming velocity behind a substantial part of the quarter-ring and even persisted upwards along the straight vertical extension. As a by-product of our study, we find that a straight vertical extension of 16 cylinder diameters is required in order to avoid any adverse effects from the upper boundary of the flow domain.

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“…If the splitter plate is located 2 D away from the cylinder, no effect of the splitter plate can be observed. Serson, Meneghini, Carmo, Volpe, and Gioria () numerically simulated the flow around a circular cylinder with detached splitter plate by using direct numerical simulations. It was noticed that the splitter plate can cause a significant reduction in vortex shedding frequency with small gaps.…”

Section: Literature Reviewmentioning

confidence: 99%

Effects of splitter plate on reducing local scour around bridge pier

Balachandar

Ramamurthy

2018

River Research & Apps

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Local scour around bridge piers has been shown to be the most common reason for bridge failures. The use of splitter plates to modify the flow field around the pier has the potential to reduce the maximum scour depth. To test the effect of the splitter plate, the present study was conducted by using plates of various lengths (1 ≤ L/D ≤ 2). Here, D is the diameter of the pier, and L is the length of the splitter plate. The splitter plate was located both in the front and at the rear of the pier. The results show that for a constant splitter plate height, the plate with a length of 1.33D located in front of the pier has the greatest impact in reducing maximum scour. Results also showed that with increasing height of the splitter plate located in front of the pier, the maximum scour depth as well as the scoured area decreased correspondingly. In the range of test variables used in this study, the back splitter plate located with or without a gap between the pier and the plate showed limited impact on reducing the maximum scour around the pier. However, a significant change of dune height was observed in the back of the pier.

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Wake transition in the flow around a circular cylinder with a splitter plate

Cited by 51 publications

References 20 publications

Three-dimensional wake transition of a diamond-shaped cylinder

Three-dimensional wake transition of a diamond-shaped cylinder

Turbulent wake behind a concave curved cylinder

Effects of splitter plate on reducing local scour around bridge pier

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