On pressure invariance, wake width and drag prediction of a bluff body in confined flow

Yeung, W. W. H.

doi:10.1017/s0022112008005247

Cited by 11 publications

(4 citation statements)

References 39 publications

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“…As a consequence, the behaviour of the shear layers is altered, forming a narrow wake with a reduction of the drag coe cient (Lehmkuhl et al, 2014;Rodríguez et al, 2015). As suggested by Roshko (1954b) and later confirmed by several experimental and numerical studies (Adachi, 1997;Yarusevych et al, 2009;Yeung, 2009;Rodríguez et al, 2015),…”

Section: Flow Parametersmentioning

confidence: 73%

LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers

Rodríguez

Lehmkuhl

Piomelli

et al. 2017

Flow Turbulence Combust

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Section: Flow Parametersmentioning

confidence: 73%

LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers

Rodríguez

Lehmkuhl

Piomelli

et al. 2017

Flow Turbulence Combust

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“…Ahlborn et al (2002) showed that C D is linearly proportional to tan θ, where θ is the angle between the transverse velocity and the streamwise velocity of vortices separated from the cylinder. Yeung (2009) found a linear relation between C D and (C p ) b for some bluff bodies such as cones and spheres. The definition of ξ is essentially related to θ and (C p ) b on the polygon; once the transition takes place, ξ characterises uniquely the location of the flow separation point.…”

Section: Discussionmentioning

confidence: 93%

Experimental study of flow around polygonal cylinders

Zhang²,

Gan

et al. 2016

J. Fluid Mech.

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The wake of polygonal cylinders with side number $N=2\sim \infty$ is systematically studied based on fluid force, hot-wire, particle image velocimetry and flow visualisation measurements. Each cylinder is examined for two orientations, with a flat surface or a corner leading and facing normally to the free stream. The Reynolds number $Re$ is $1.0\times 10^{4}\sim 1.0\times 10^{5}$, based on the longitudinally projected cylinder width. The time-averaged drag coefficient $C_{D}$ and fluctuating lift coefficient on these cylinders are documented, along with the characteristic properties including the Strouhal number $St$, flow separation point and angle $\unicode[STIX]{x1D703}_{s}$, wake width and critical Reynolds number $Re_{c}$ at which the transition from laminar to turbulent flow occurs. It is found that once $N$ exceeds 12, $Re_{c}$ depends on the difference between the inner diameter (tangent to the faces) and the outer diameter (connecting corners) of a polygon, the relationship being approximately given by the dependence of $Re_{c}$ on the height of the roughness elements for a circular cylinder. It is further found that $C_{D}$ versus $\unicode[STIX]{x1D709}$ or $St$ versus $\unicode[STIX]{x1D709}$ for all the tested cases collapse onto a single curve, where the angle $\unicode[STIX]{x1D709}$ is the corrected $\unicode[STIX]{x1D703}_{s}$ associated with the laterally widest point of the polygon and the separation point. Finally, the empirical correlation between $C_{D}$ and $St$ is discussed.

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“…Other studies have found that confinement has a strong effect on the drag on single particles 1,3,18,47 . For Re p up to about 300, Akutsu 3 found that a 30% area blockage increased the drag coefficient by more than a factor of two.…”

Section: Particle Dragmentioning

confidence: 90%

Particle-resolved simulations of shock-induced flow through particle clouds at different Reynolds numbers

et al. 2020

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This study investigates the Reynolds-number dependence of shock-induced flow through particle layers at 10% volume fraction, using ensemble-averaged results from particle-resolved large eddy simulations. The advantage of using large eddy simulations to study this problem is that they capture the strong velocity shears and flow separation caused by the no-slip condition at the particle surfaces. The shock particle cloud interaction produces a reflected shock wave, whose strength increases with decreasing particle Reynolds number. This results in important changes to the flow field that enters the particle cloud. The results show an approximate proportionality between the mean flow velocity and the flow fluctuation magnitudes. Maximum particle drag forces are in excellent agreement with previous inviscid studies, and we complement these results with statistics of time-averaged particle forces as well as the variation of temporal oscillations. The results of this work provides a basis for development of improved simplified dispersed flow models.

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On pressure invariance, wake width and drag prediction of a bluff body in confined flow

Cited by 11 publications

References 39 publications

LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers

LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers

Experimental study of flow around polygonal cylinders

Particle-resolved simulations of shock-induced flow through particle clouds at different Reynolds numbers

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