Numerical simulation of cloud-clear air interfacial mixing: Homogeneous versus inhomogeneous mixing

This note presents an analysis of several dozens of direct numerical simulations of the cloud–clear air mixing in a setup of decaying moist turbulence with bin microphysics. The goal is to assess the instantaneous relationship between the homogeneity of mixing and the ratio of the time scales of droplet evaporation and turbulent homogenization. Such a relationship is important for developing improved microphysical parameterizations for large-eddy simulation of clouds. The analysis suggests a robust relationship for the range of time scale ratios between 0.5 and 10. Outside this range, the scatter of numerical data is significant, with smaller and larger time scale ratios corresponding to mixing scenarios that approach the extremely inhomogeneous and homogeneous limits, respectively. This is consistent with the heuristic argument relating the homogeneity of mixing to the time scale ratio.

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Copyright 2009 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.
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Author Andrejczuk, M.
Grabowski, Wojciech
Malinowski, S.
Smolarkiewicz, Piotr
Publisher UCAR/NCAR - Library
Publication Date 2009-01-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2025-07-17T15:54:42.799804
Metadata Record Identifier edu.ucar.opensky::articles:6184
Metadata Language eng; USA
Suggested Citation Andrejczuk, M., Grabowski, Wojciech, Malinowski, S., Smolarkiewicz, Piotr. (2009). Numerical simulation of cloud-clear air interfacial mixing: Homogeneous versus inhomogeneous mixing. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7c53m19. Accessed 31 July 2025.

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