Buoyancy statistics in moist turbulent rayleigh-bénard convection

Jörg Schumacher, Olivier Pauluis

Research output: Contribution to journalArticlepeer-review

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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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