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Collision Fluctuati...
Collision Fluctuations of Lucky Droplets with Superdroplets
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- Li, X. Y. (författare)
- Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Nordita, KTH Royal Institute of Technology and Stockholm University, 10691 Stockholm, Sweden; Swedish e-Science Research Centre, www.e-science.se, Stockholm, Sweden; JILA and Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA
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- Mehlig, Bernhard, 1964 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Department of Physics, Gothenburg University, 41296 Gothenburg, Sweden
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- Svensson, G. (författare)
- Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Swedish e-Science Research Centre, www.e-science.se, Stockholm, Sweden
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- Brandenburg, A. (författare)
- Nordita, KTH Royal Institute of Technology and Stockholm University, 10691 Stockholm, Sweden; JILA and Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA; The Oskar Klein Centre, Department of Astronomy, Stockholm University, AlbaNova, SE-10691 Stockholm, Sweden
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- Haugen, Nils Erland L. (författare)
- Luleå tekniska universitet,Energivetenskap,SINTEF Energy Research, 7465 Trondheim, Norway
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Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Nordita, KTH Royal Institute of Technology and Stockholm University, 10691 Stockholm, Sweden; Swedish e-Science Research Centre, wwwe-science.se, Stockholm, Sweden; JILA and Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA Institutionen för fysik (GU) (creator_code:org_t)
- American Meteorological Society, 2022
- 2022
- Engelska.
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Ingår i: Journal of the Atmospheric Sciences. - : American Meteorological Society. - 0022-4928 .- 1520-0469. ; 79:7, s. 1821-1835
- Relaterad länk:
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- It was previously shown that the superdroplet algorithm for modeling the collision-coalescence process can faithfully represent mean droplet growth in turbulent clouds. An open question is how accurately the superdroplet algorithm accounts for fluctuations in the collisional aggregation process. Such fluctuations are particularly important in dilute suspensions. Even in the absence of turbulence, Poisson fluctuations of collision times in dilute suspensions may result in substantial variations in the growth process, resulting in a broad distribution of growth times to reach a certain droplet size. We quantify the accuracy of the superdroplet algorithm in describing the fluctuating growth history of a larger droplet that settles under the effect of gravity in a quiescent fluid and collides with a dilute suspension of smaller droplets that were initially randomly distributed in space ("lucky droplet model"). We assess the effect of fluctuations upon the growth history of the lucky droplet and compute the distribution of cumulative collision times. The latter is shown to be sensitive enough to detect the subtle increase of fluctuations associated with collisions between multiple lucky droplets. The superdroplet algorithm incorporates fluctuations in two distinct ways: through the random spatial distribution of superdroplets and through the Monte Carlo collision algorithm involved. Using specifically designed numerical experiments, we show that both on their own give an accurate representation of fluctuations. We conclude that the superdroplet algorithm can faithfully represent fluctuations in the coagulation of droplets driven by gravity.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
Nyckelord
- Atmosphere
- Aerosols
- Cloud droplets
- cloud droplets
- stochastic coalescence
- ice particles
- model
- growth
- microphysics
- simulation
- fragmentation
- precipitation
- coagulation
- Meteorology & Atmospheric Sciences
- Energiteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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