Investigation of Turbulent Entrainment-Mixing Processes With a New Particle-Resolved Direct Numerical Simulation Model
Abstract
Here, a new particle-resolved three dimensional direct numerical simulation (DNS) model is developed that combines Lagrangian droplet tracking with the Eulerian field representation of turbulence near the Kolmogorov microscale. Six numerical experiments are performed to investigate the processes of entrainment of clear air and subsequent mixing with cloudy air and their interactions with cloud microphysics. The experiments are designed to represent different combinations of three configurations of initial cloudy area and two turbulence modes (decaying and forced turbulence). Five existing measures of microphysical homogeneous mixing degree are examined, modified, and compared in terms of their ability as a unifying measure to represent the effect of various entrainment-mixing mechanisms on cloud microphysics. Also examined and compared are the conventional Damköhler number and transition scale number as a dynamical measure of different mixing mechanisms. Relationships between the various microphysical measures and dynamical measures are investigated in search for a unified parameterization of entrainment-mixing processes. The results show that even with the same cloud water fraction, the thermodynamic and microphysical properties are different, especially for the decaying cases. Further analysis confirms that despite the detailed differences in cloud properties among the six simulation scenarios, the variety of turbulent entrainment-mixing mechanisms can be reasonablymore »
- Authors:
-
[2];
[3]
- Stony Brook Univ., NY (United States). Dept. of Applied Mathematics and Statistics
- Stony Brook Univ., NY (United States). Dept. of Applied Mathematics and Statistics; Brookhaven National Lab. (BNL), Upton, NY (United States)
- Nanjing Univ. of Technology (China). State Key Lab. for Aerosol-Cloud-Precipitation of China Meteorological Administration
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); US Army Research Office (ARO); National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1424986
- Report Number(s):
- BNL-203223-2018-JAAM
Journal ID: ISSN 2169-897X
- Grant/Contract Number:
- SC0012704; W911NF-15-1-0403; 91537108; BK20160041
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research: Atmospheres
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 4; Journal ID: ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Gao, Zheng, Liu, Yangang, Li, Xiaolin, and Lu, Chunsong. Investigation of Turbulent Entrainment-Mixing Processes With a New Particle-Resolved Direct Numerical Simulation Model. United States: N. p., 2018.
Web. doi:10.1002/2017JD027507.
Gao, Zheng, Liu, Yangang, Li, Xiaolin, & Lu, Chunsong. Investigation of Turbulent Entrainment-Mixing Processes With a New Particle-Resolved Direct Numerical Simulation Model. United States. https://doi.org/10.1002/2017JD027507
Gao, Zheng, Liu, Yangang, Li, Xiaolin, and Lu, Chunsong. Mon .
"Investigation of Turbulent Entrainment-Mixing Processes With a New Particle-Resolved Direct Numerical Simulation Model". United States. https://doi.org/10.1002/2017JD027507. https://www.osti.gov/servlets/purl/1424986.
@article{osti_1424986,
title = {Investigation of Turbulent Entrainment-Mixing Processes With a New Particle-Resolved Direct Numerical Simulation Model},
author = {Gao, Zheng and Liu, Yangang and Li, Xiaolin and Lu, Chunsong},
abstractNote = {Here, a new particle-resolved three dimensional direct numerical simulation (DNS) model is developed that combines Lagrangian droplet tracking with the Eulerian field representation of turbulence near the Kolmogorov microscale. Six numerical experiments are performed to investigate the processes of entrainment of clear air and subsequent mixing with cloudy air and their interactions with cloud microphysics. The experiments are designed to represent different combinations of three configurations of initial cloudy area and two turbulence modes (decaying and forced turbulence). Five existing measures of microphysical homogeneous mixing degree are examined, modified, and compared in terms of their ability as a unifying measure to represent the effect of various entrainment-mixing mechanisms on cloud microphysics. Also examined and compared are the conventional Damköhler number and transition scale number as a dynamical measure of different mixing mechanisms. Relationships between the various microphysical measures and dynamical measures are investigated in search for a unified parameterization of entrainment-mixing processes. The results show that even with the same cloud water fraction, the thermodynamic and microphysical properties are different, especially for the decaying cases. Further analysis confirms that despite the detailed differences in cloud properties among the six simulation scenarios, the variety of turbulent entrainment-mixing mechanisms can be reasonably represented with power-law relationships between the microphysical homogeneous mixing degrees and the dynamical measures.},
doi = {10.1002/2017JD027507},
journal = {Journal of Geophysical Research: Atmospheres},
number = 4,
volume = 123,
place = {United States},
year = {2018},
month = {2}
}
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Cited by: 12 works
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Table 1: Summary of key model parameters and initial conditions
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Works referencing / citing this record:
Direct Numerical Simulation of a Warm Cloud Top Model Interface: Impact of the Transient Mixing on Different Droplet Population
journal, August 2019
- Bhowmick, Taraprasad; Iovieno, Michele
- Fluids, Vol. 4, Issue 3
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