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Direct Numerical Simulation of Turbulent Condensation in CloudsIn this brief, we investigate the turbulent condensation of a population of droplets by means of a direct numerical simulation. To that end, a coupled Navier-Stokes/Lagrangian solver is used where each particle is tracked and its growth by water vapor condensation is monitored exactly. The main goals of the study are to find out whether turbulence broadens the droplet size distribution, as observed in in situ measurements. The second issue is to understand if and for how long a correlation between the droplet radius and the local supersaturation exists for the purpose of modeling sub-grid scale microphysics in cloud-resolving codes. This brief is organized as follows. In Section 2 the governing equations are presented, including the droplet condensation model. The implementation of the forcing procedure is described in Section 3. The simulation results are presented in Section 4 together with a sketch of a simple stochastic model for turbulent condensation. Conclusions and the main outcomes of the study are given in Section 5.
Document ID
20050061085
Document Type
Other
Authors
Shariff, K. (NASA Ames Research Center Moffett Field, CA, United States)
Paoli, R. (Stanford Univ. Stanford, CA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Annual Research Briefs, 2004: Center for Turbulence Research
Subject Category
Fluid Mechanics and Thermodynamics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle20050061070Analytic PrimaryAnnual Research Briefs, 2004: Center for Turbulence Research