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The interaction between the cloud droplets and homogeneous turbulence which are coupled through buoyancy is examined by using direct numerical simulation. A cloud droplet is expressed as a small spherical water drop with a few attributes such as radius, characteristic time, and mass. Two kinds of simulation for decaying turbulence from a steady state, wet run and dry run depending on with and without the buoyancy, respectively, are examined. It is found that the cloud droplets cause the decay of turbulence slower through the buoyancy generated by the heat exchange due to the evaporation or condensation. The spectral support of the buoyancy force is found to be at high wavenumbers at early times and to gradually shift toward low wavenumbers.
Author(s):
Toshiyuki Gotoh
Nagoya Institute of Technology
Japan
Yuya Kozaki
Nagoya Institute of Technology
Japan
Yuki Suzuki
Denso Corporation
Japan
Takeshi Watanabe
Nagoya Institute of Technology
Japan