Buoyancy statistics in moist turbulent Rayleigh-Benard convection

Details Buoyancy statistics in moist turbulent Rayleigh-Benard convection Buoyancy statistics in moist turbulent Rayleigh-Benard convection

2009-12-28

arxiv.org/abs/0912.5195v2

J. Fluid Mech., Volume 648 (2010) 509-519

Physics

Fluid Dynamics

9 Pages, 6 Postscript figures, Corrections are added

Scientific paper

10.1017/S0022112010000030

We study shallow moist Rayleigh-Benard 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-Benard problem offers a practical framework for the development and evaluation of parametrizations for atmospheric convection.

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