Publication

Etude expérimentale de l’écoulement derrière une bosse

François Gallaire, Edouard Boujo
2011
Conference Papers

Abstract

Properties of the unsteady separated flow over a bump mounted on a flat plate are studied experimen- tally, with the aim of characterizing the instabilities of this flow and developing a control strategy. Results from measurements using particle image velocimetry (length of the recirculation zone, critical Reynolds number) are analyzed and compared to numerical predictions.

Official source

https://infoscience.epfl.ch/entities/publication/335cee73-0b9d-4d7d-8cd8-270d26a7faf6

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François Gallaire, Edouard Boujo
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/335cee73-0b9d-4d7d-8cd8-270d26a7faf6

About this result

Related concepts (11)

Reynolds number

In fluid mechanics, the Reynolds number (Re) is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the ratio between inertial and viscous forces. At low Reynolds numbers, flows tend to be dominated by laminar (sheet-like) flow, while at high Reynolds numbers, flows tend to be turbulent. The turbulence results from differences in the fluid's speed and direction, which may sometimes intersect or even move counter to the overall direction of the flow (eddy currents).

Fluid dynamics

In physics, physical chemistry and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids—liquids and gases. It has several subdisciplines, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moments on aircraft, determining the mass flow rate of petroleum through pipelines, predicting weather patterns, understanding nebulae in interstellar space and modelling fission weapon detonation.

Wake (physics)

In fluid dynamics, a wake may either be: the region of recirculating flow immediately behind a moving or stationary blunt body, caused by viscosity, which may be accompanied by flow separation and turbulence, or the wave pattern on the water surface downstream of an object in a flow, or produced by a moving object (e.g. a ship), caused by density differences of the fluids above and below the free surface and gravity (or surface tension).

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