Buoyancy statistics in moist turbulent Rayleigh–Bénard convection
Buoyancy statistics in moist turbulent Rayleigh–Bénard convection
复制标题
潮湿湍流瑞利-贝纳德对流中的浮力统计
DOI：
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发表时间：
2009
影响因子：
3.7
通讯作者：
O. Pauluis
中科院分区：
文献类型：
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作者：
J. Schumacher;O. Pauluis
在Boussinesq近似下，我们研究了浅层湿Rayleigh-Bénard对流的三维直接数值模拟。相变的热力学近似为接近相边界的分段线性状态方程。讨论了相变对湍流波动和浮力通过层的转移的影响，作为瑞利数和形成液态水的能力的函数。由于相变的增强浮力通量与干对流参考案例进行了比较，并与对流层中的云量有关。这项研究表明，湿瑞利-贝纳德问题提供了一个实用的框架，为发展和评估的参数化大气对流。
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.