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

Direct numerical solutions are described for flow past a body placed in an otherwise uniform shear layer adjoining a wall. The study is associated with potential impact of the body onto the wall. Steady two-dimensional flow solutions are calculated for an inclined flat plate in particular, covering...

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Bibliographic Details
Published in:Journal of fluid mechanics 2021-03, Vol.915, Article A35
Main Authors: Palmer, Ryan A., Smith, Frank T.
Format: Article
Language:English
Subjects:
Aircraft
Computational fluid dynamics
Flat plates
Flow characteristics
Flow separation
Flow structures
Fluid flow
Investigations
JFM Papers
Reynolds number
Shear flow
Shear layers
Two dimensional flow
Velocity
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Summary:Direct numerical solutions are described for flow past a body placed in an otherwise uniform shear layer adjoining a wall. The study is associated with potential impact of the body onto the wall. Steady two-dimensional flow solutions are calculated for an inclined flat plate in particular, covering cases of zero wall velocity, positive wall velocity and negative wall velocity, with the plate being at varying orientations and distances from the wall. Substantial flow separation is found with reduced proximity to the wall or increased plate incidence, caused partly by the cutting off of the mass flux in the gap between the body and the wall as impact is neared. Other distinct flow characteristics that emerge with increased local Reynolds number are the extent of the enhanced wake responses, greatly condensed upstream influence near the leading edge, increased sensitivity to body orientation, the pressure dominance in the total lift and moment on the body, new insight into the complex flow structure and quantitative agreement with a recent viscous–inviscid interaction analysis on scales.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2021.92