A body in nonlinear near-wall shear flow: numerical results for a flat plate

Palmer, Ryan; Smith, F. T.

doi:10.1017/jfm.2021.92

Cited by 5 publications

(8 citation statements)

References 39 publications

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“…The typical Reynolds number of real interest is large. A feature common to the recent investigations in [8][9][10][11][12][13][14] for boundary layer and channel flows and to the study herein is that the fluid-flow vorticity is non-zero, contrasting with the cases considered in [5][6][7]. Moreover interactions between a body and the surrounding fluid flow near a solid fixed wall are generally quite different from the well-known interplay provoked by a bump on a wall in view of, first, the presence of a gap between the body and the wall; second, the subtle adjustments of flow near the upstream and downstream ends of the body and third, the increased number of substantial flow regions that become present.…”

Section: Introductionmentioning

confidence: 69%

“…The position and magnitude of the separation are highly dependent on the inclination of the body, with a more parallel formation producing significant reversal ahead of and behind the body. It is expected that the results of [13] concerning the effects (on upstream influence and separation) of different Reynolds numbers and different magnitudes of wall velocities for a flat plate will also hold in this scenario. Agreement with reduced-system analysis for a flat plate is found in [14].…”

Section: Commentsmentioning

confidence: 96%

“…The boundary conditions of tangential flow at the solid surfaces, assuming there is no significant separation [5][6][7][8][9][10][11][12][13][14], arê…”

Section: Boundary-layer Settingmentioning

confidence: 99%

“…This section concerns an elliptical body near the wall where uniform-shear flow is present with an incident velocity gradientλ, as in [11,13] where a flat-plate configuration is studied. The local Reynolds number is R. Direct numerical solutions of the Navier-Stokes equations are described below for the elliptical body being on the verge of impact.…”

Section: Near-wall Body With or Without Translationmentioning

confidence: 99%

“…Here, (4.3) applies at large distances, including the incident shear effect far upstream and downstream. Similar to the method outlined in [13], direct numerical simulations were carried out in OpenFOAM version 1812 using the built in solver simpleFoam to calculate the fluid flow about the body [36,37].…”

Section: Near-wall Body With or Without Translationmentioning

confidence: 99%

See 4 more Smart Citations

Particle movement in a boundary layer

Jolley¹,

Palmer

Smith³

2021

J Eng Math

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The study here is concerned with a thin solid body passing through a boundary layer or channel flow and interacting with the flow. Relevant new features from modelling, analysis and computation are presented along with comparisons. Three scenarios of such fluid-body interactive evolution in two-dimensional settings are considered in turn, namely a long body translating upstream or downstream, a long body with little or no translation and a short body with or without translation. The main progress and findings concern predictions of the time taken by the body to traverse the flow and impact upon the underlying wall, the delicate behaviour at the onset of impact, the dependence on parameters such as the initial conditions and the mass and shape of the body, and the influence of streamwise translation of the body in the surrounding fluid flow.

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Section: Introductionmentioning

confidence: 69%

Section: Commentsmentioning

confidence: 96%

“…The boundary conditions of tangential flow at the solid surfaces, assuming there is no significant separation [5][6][7][8][9][10][11][12][13][14], arê…”

Section: Boundary-layer Settingmentioning

confidence: 99%

Section: Near-wall Body With or Without Translationmentioning

confidence: 99%

Section: Near-wall Body With or Without Translationmentioning

confidence: 99%

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Particle movement in a boundary layer

Jolley¹,

Palmer

Smith³

2021

J Eng Math

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Fluid flow past a freely moving body in a straight or distorted channel

Yazar,

Liu,

Smith

2024

Theor. Comput. Fluid Dyn.

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The focus here is on a thin solid body passing through a channel flow and interacting with the flow. Unsteady two-dimensional interactive properties from modelling, analysis and computation are presented along with comparisons. These include the effects of a finite dilation or constriction, as the body travels through, and the effects of a continuing expansion of the vessel. Finite-time clashing of the body with the channel walls is investigated as well as the means to avoid clashing. Sustained oscillations are found to be possible. Wake properties behind the body are obtained, and broad agreement in trends between full-system and reduced-system responses is found for increased body mass. Graphical abstract

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On modelling fluid/body interactions, impacts and lift-offs

2023

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A description is given of recent progress in the understanding of mechanisms in fluid-body interactions where the motion of a body and the motion of the surrounding fluid affect each other substantially. The mathematical modelling of such unsteady interactions is for internal channel and external near-wall flows in two spatial dimensions and time. The emphasis throughout is on analytical developments with accompanying reduced computation. The successive aspects studied here are interactions and impacts in inviscid flows, skimming and sinking, the lift-off, fly-away or bouncing of a body, and viscous effects including especially the interplay between viscous and inviscid contributions. The main findings are concerned with physical and mechanical insights into impact times, lift-off criteria, the borders between impact and fly-away, the principal parameters and their ranges and the influences from body shape and mass.

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A body in nonlinear near-wall shear flow: numerical results for a flat plate

Abstract: Abstract

Cited by 5 publications

References 39 publications

Particle movement in a boundary layer

Particle movement in a boundary layer

Fluid flow past a freely moving body in a straight or distorted channel

On modelling fluid/body interactions, impacts and lift-offs

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