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Eulerian and Lagrangian approaches to multidimensional condensation and collection
Stockholm University, Faculty of Science, Department of Meteorology . Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Swedish e-Science Research Centre, Sweden; University of Colorado, USA.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. University of Colorado, USA.
Stockholm University, Faculty of Science, Department of Meteorology . Swedish e-Science Research Centre, Sweden; National Center for Atmospheric Research, USA.
Number of Authors: 4
2017 (English)In: Journal of Advances in Modeling Earth Systems, ISSN 1942-2466, Vol. 9, no 2, 1116-1137 p.Article in journal (Refereed) Published
Abstract [en]

Turbulence is argued to play a crucial role in cloud droplet growth. The combined problem of turbulence and cloud droplet growth is numerically challenging. Here an Eulerian scheme based on the Smoluchowski equation is compared with two Lagrangian superparticle (or superdroplet) schemes in the presence of condensation and collection. The growth processes are studied either separately or in combination using either two-dimensional turbulence, a steady flow or just gravitational acceleration without gas flow. Good agreement between the different schemes for the time evolution of the size spectra is observed in the presence of gravity or turbulence. The Lagrangian superparticle schemes are found to be superior over the Eulerian one in terms of computational performance. However, it is shown that the use of interpolation schemes such as the cloud-in-cell algorithm is detrimental in connection with superparticle or superdroplet approaches. Furthermore, the use of symmetric over asymmetric collection schemes is shown to reduce the amount of scatter in the results. For the Eulerian scheme, gravitational collection is rather sensitive to the mass bin resolution, but not so in the case with turbulence. Plain Language Summary The bottleneck problem of cloud droplet growth is one of the most challenging problems in cloud physics. Cloud droplet growth is neither dominated by condensation nor gravitational collision in the size range of 15 mu m similar to 40 mu m [1]. Turbulence-generated collection has been thought to be the mechanism to bridge the size gap, i.e., the bottleneck problem. This study compares the Lagrangian and Eulerian schemes in detail to tackle with the turbulence-generated collection.

Place, publisher, year, edition, pages
2017. Vol. 9, no 2, 1116-1137 p.
Keyword [en]
Eulerian Smoluchowski and Lagrangian superdroplet, collection, cloud droplets, turbulence, size spectra
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-146001DOI: 10.1002/2017MS000930ISI: 000406239300020OAI: oai:DiVA.org:su-146001DiVA: diva2:1136556
Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2017-08-28Bibliographically approved

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