Buoyancy statistics in moist turbulent rayleigh-bénard convection

Jörg Schumacher, Olivier Pauluis

Research output: Contribution to journalArticle

Abstract

We study shallow moist Rayleigh-Bénard convection in the Boussinesq approximation in three-dimensional direct numerical simulations. The thermodynamics of phase changes is approximated by a piecewise linear equation of state close to the phase boundary. The impact of phase changes on the turbulent fluctuations and the transfer of buoyancy through the layer is discussed as a function of the Rayleigh number and the ability to form liquid water. The enhanced buoyancy flux due to phase changes is compared with dry convection reference cases and related to the cloud cover in the convection layer. This study indicates that the moist Rayleigh-Bénard problem offers a practical framework for the development and evaluation of parameterizations for atmospheric convection.

Original languageEnglish (US)
Pages (from-to)509-519
Number of pages11
JournalJournal of Fluid Mechanics
Volume648
DOIs
StatePublished - Apr 10 2010

Fingerprint

Buoyancy
buoyancy
convection
Statistics
statistics
Boussinesq approximation
cloud cover
Direct numerical simulation
Phase boundaries
linear equations
Rayleigh number
Parameterization
Linear equations
direct numerical simulation
parameterization
Equations of state
equations of state
Thermodynamics
Fluxes
thermodynamics

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Buoyancy statistics in moist turbulent rayleigh-bénard convection. / Schumacher, Jörg; Pauluis, Olivier.

In: Journal of Fluid Mechanics, Vol. 648, 10.04.2010, p. 509-519.

Research output: Contribution to journalArticle

@article{4265d434d5254a14bdbe09483e1f3d16,
title = "Buoyancy statistics in moist turbulent rayleigh-b{\'e}nard convection",
abstract = "We study shallow moist Rayleigh-B{\'e}nard convection in the Boussinesq approximation in three-dimensional direct numerical simulations. The thermodynamics of phase changes is approximated by a piecewise linear equation of state close to the phase boundary. The impact of phase changes on the turbulent fluctuations and the transfer of buoyancy through the layer is discussed as a function of the Rayleigh number and the ability to form liquid water. The enhanced buoyancy flux due to phase changes is compared with dry convection reference cases and related to the cloud cover in the convection layer. This study indicates that the moist Rayleigh-B{\'e}nard problem offers a practical framework for the development and evaluation of parameterizations for atmospheric convection.",
author = "J{\"o}rg Schumacher and Olivier Pauluis",
year = "2010",
month = "4",
day = "10",
doi = "10.1017/S0022112010000030",
language = "English (US)",
volume = "648",
pages = "509--519",
journal = "Journal of Fluid Mechanics",
issn = "0022-1120",
publisher = "Cambridge University Press",

}

TY - JOUR

T1 - Buoyancy statistics in moist turbulent rayleigh-bénard convection

AU - Schumacher, Jörg

AU - Pauluis, Olivier

PY - 2010/4/10

Y1 - 2010/4/10

N2 - We study shallow moist Rayleigh-Bénard convection in the Boussinesq approximation in three-dimensional direct numerical simulations. The thermodynamics of phase changes is approximated by a piecewise linear equation of state close to the phase boundary. The impact of phase changes on the turbulent fluctuations and the transfer of buoyancy through the layer is discussed as a function of the Rayleigh number and the ability to form liquid water. The enhanced buoyancy flux due to phase changes is compared with dry convection reference cases and related to the cloud cover in the convection layer. This study indicates that the moist Rayleigh-Bénard problem offers a practical framework for the development and evaluation of parameterizations for atmospheric convection.

AB - We study shallow moist Rayleigh-Bénard convection in the Boussinesq approximation in three-dimensional direct numerical simulations. The thermodynamics of phase changes is approximated by a piecewise linear equation of state close to the phase boundary. The impact of phase changes on the turbulent fluctuations and the transfer of buoyancy through the layer is discussed as a function of the Rayleigh number and the ability to form liquid water. The enhanced buoyancy flux due to phase changes is compared with dry convection reference cases and related to the cloud cover in the convection layer. This study indicates that the moist Rayleigh-Bénard problem offers a practical framework for the development and evaluation of parameterizations for atmospheric convection.

UR - http://www.scopus.com/inward/record.url?scp=77952414536&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77952414536&partnerID=8YFLogxK

U2 - 10.1017/S0022112010000030

DO - 10.1017/S0022112010000030

M3 - Article

VL - 648

SP - 509

EP - 519

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

ER -