Shear and mixing in oscillatory doubly diffusive convection

Francesco Paparella, Edward A. Spiegel, Suzanne Talon

Research output: Contribution to journalArticle

Abstract

To investigate the mechanism of mixing in oscillatory doubly diffusive (ODD) convection, we truncate the horizontal modal expansion of the Boussinesq equations to obtain a simplified model of the process. In the astrophysically interesting case with low Prandtl number (traditionally called semiconvection), large-scale shears are generated as in ordinary thermal convection. The interplay between the shear and the oscillatory convection produces intermittent overturning of the fluid with significant mixing. By contrast, in the parameter regime appropriate to sea water, large-scale flows are not generated by the convection. However, if such flows are imposed externally, intermittent overturning with enhanced mixing is observed.

Original languageEnglish (US)
Pages (from-to)271-289
Number of pages19
JournalGeophysical and Astrophysical Fluid Dynamics
Volume96
Issue number4
DOIs
StatePublished - Aug 1 2002

Fingerprint

convection
shear
Boussinesq equation
thermal convection
sea water
Prandtl number
free convection
seawater
expansion
fluid
fluids
Fluids
Convection
Water
parameter

Keywords

  • Mixing
  • Oscillatory doubly diffusive convection
  • Semiconvection
  • Shear

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Mechanics of Materials
  • Computational Mechanics
  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Shear and mixing in oscillatory doubly diffusive convection. / Paparella, Francesco; Spiegel, Edward A.; Talon, Suzanne.

In: Geophysical and Astrophysical Fluid Dynamics, Vol. 96, No. 4, 01.08.2002, p. 271-289.

Research output: Contribution to journalArticle

Paparella, Francesco ; Spiegel, Edward A. ; Talon, Suzanne. / Shear and mixing in oscillatory doubly diffusive convection. In: Geophysical and Astrophysical Fluid Dynamics. 2002 ; Vol. 96, No. 4. pp. 271-289.
@article{3a78d6c9e93b4dcc977c95abce9571dd,
title = "Shear and mixing in oscillatory doubly diffusive convection",
abstract = "To investigate the mechanism of mixing in oscillatory doubly diffusive (ODD) convection, we truncate the horizontal modal expansion of the Boussinesq equations to obtain a simplified model of the process. In the astrophysically interesting case with low Prandtl number (traditionally called semiconvection), large-scale shears are generated as in ordinary thermal convection. The interplay between the shear and the oscillatory convection produces intermittent overturning of the fluid with significant mixing. By contrast, in the parameter regime appropriate to sea water, large-scale flows are not generated by the convection. However, if such flows are imposed externally, intermittent overturning with enhanced mixing is observed.",
keywords = "Mixing, Oscillatory doubly diffusive convection, Semiconvection, Shear",
author = "Francesco Paparella and Spiegel, {Edward A.} and Suzanne Talon",
year = "2002",
month = "8",
day = "1",
doi = "10.1080/03091920290029031",
language = "English (US)",
volume = "96",
pages = "271--289",
journal = "Geophysical and Astrophysical Fluid Dynamics",
issn = "0309-1929",
publisher = "Taylor and Francis Ltd.",
number = "4",

}

TY - JOUR

T1 - Shear and mixing in oscillatory doubly diffusive convection

AU - Paparella, Francesco

AU - Spiegel, Edward A.

AU - Talon, Suzanne

PY - 2002/8/1

Y1 - 2002/8/1

N2 - To investigate the mechanism of mixing in oscillatory doubly diffusive (ODD) convection, we truncate the horizontal modal expansion of the Boussinesq equations to obtain a simplified model of the process. In the astrophysically interesting case with low Prandtl number (traditionally called semiconvection), large-scale shears are generated as in ordinary thermal convection. The interplay between the shear and the oscillatory convection produces intermittent overturning of the fluid with significant mixing. By contrast, in the parameter regime appropriate to sea water, large-scale flows are not generated by the convection. However, if such flows are imposed externally, intermittent overturning with enhanced mixing is observed.

AB - To investigate the mechanism of mixing in oscillatory doubly diffusive (ODD) convection, we truncate the horizontal modal expansion of the Boussinesq equations to obtain a simplified model of the process. In the astrophysically interesting case with low Prandtl number (traditionally called semiconvection), large-scale shears are generated as in ordinary thermal convection. The interplay between the shear and the oscillatory convection produces intermittent overturning of the fluid with significant mixing. By contrast, in the parameter regime appropriate to sea water, large-scale flows are not generated by the convection. However, if such flows are imposed externally, intermittent overturning with enhanced mixing is observed.

KW - Mixing

KW - Oscillatory doubly diffusive convection

KW - Semiconvection

KW - Shear

UR - http://www.scopus.com/inward/record.url?scp=33646061844&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33646061844&partnerID=8YFLogxK

U2 - 10.1080/03091920290029031

DO - 10.1080/03091920290029031

M3 - Article

AN - SCOPUS:33646061844

VL - 96

SP - 271

EP - 289

JO - Geophysical and Astrophysical Fluid Dynamics

JF - Geophysical and Astrophysical Fluid Dynamics

SN - 0309-1929

IS - 4

ER -