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Formation of localized sand patterns downstream from a vertical cylinder under steady flows: Experimental and theoretical study
- Source :
- Physical Review E, Physical Review E, American Physical Society (APS), 2016, 94 (5), pp.052903. ⟨10.1103/PhysRevE.94.052903⟩, Physical Review E, American Physical Society (APS), 2016, 94 (5), 〈10.1103/PhysRevE.94.052903〉
- Publication Year :
- 2016
-
Abstract
- International audience; The generation of localized, spatially periodic patterns on a sandy bottom is experimentally and theoretically studied. Tests are performed in a hydrodynamic flume where patterns are produced downstream from a vertical cylinder under a steady current. It is found that patterns appear as a result of a subcritical instability of the water-sand bottom interface. A dependence of the area shape occupied by the patterns on the flow velocity and the cylinder diameter is investigated. It is shown that the patterns' characteristics can be explained using the Swift-Hohenberg equation. Numerical simulations point out that for a correct description of the patterns, an additional term which takes into account the impact of vortices on the sandy bottom in the wake of a cylinder must be added in the Swift-Hohenberg equation.
- Subjects :
- [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
Mechanics
Wake
01 natural sciences
Instability
[SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
010305 fluids & plasmas
Vortex
Physics::Fluid Dynamics
Current (stream)
Flume
[ PHYS.PHYS.PHYS-GEO-PH ] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
Flow velocity
0103 physical sciences
[ SPI.MECA.MEFL ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
[ SDU.ENVI ] Sciences of the Universe [physics]/Continental interfaces, environment
Cylinder
[ PHYS.PHYS.PHYS-FLU-DYN ] Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]
Point (geometry)
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
010306 general physics
Geology
Subjects
Details
- ISSN :
- 24700053 and 24700045
- Volume :
- 94
- Issue :
- 5-1
- Database :
- OpenAIRE
- Journal :
- Physical review. E
- Accession number :
- edsair.doi.dedup.....44a6bf469221bd7c50f372c72f257f33