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Unterstrasser, Simon and Sölch, Ingo (2014) Optimisation of simulation particle number in a Lagrangian ice microphysical model. Geoscientific Model Development, 7, pp. 695-709. Copernicus Publications. DOI: 10.5194/gmd-7-695-2014 ISSN 1991-959X
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Official URL: http://www.geosci-model-dev.net/7/695/2014/
Abstract
This paper presents various techniques to speed up the Lagrangian ice microphysics code EULAG-LCM. The amount of CPU time (and also memory and storage data) depends heavily on the number of simulation ice particles (SIPs) used to represent the bulk of real ice crystals. It was found that the various microphysical processes require different numbers of SIPs to reach statistical convergence (in a sense that a further increase of the SIP number does not systematically change the physical outcome of a cirrus simulation). Whereas deposition/sublimation and sedimentation require only a moderate number of SIPs, the (nonlinear) ice nucleation process is only well represented, when a large number of SIPs is generated. We introduced a new stochastic nucleation implementation which mimics the stochastic nature of nucleation and greatly reduces numerical sensitivities. Furthermore several strategies (SIP merging and splitting) are presented which flexibly adjust and reduce the number of SIPs. These efficiency measures reduce the computational costs of present cirrus studies and allow extending the temporal and spatial scales of upcoming studies.
| Item URL in elib: | https://elib.dlr.de/89053/ | |||||||||
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| Document Type: | Article | |||||||||
| Title: | Optimisation of simulation particle number in a Lagrangian ice microphysical model | |||||||||
| Authors: |
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| Date: | 2014 | |||||||||
| Journal or Publication Title: | Geoscientific Model Development | |||||||||
| Refereed publication: | Yes | |||||||||
| Open Access: | Yes | |||||||||
| Gold Open Access: | Yes | |||||||||
| In SCOPUS: | Yes | |||||||||
| In ISI Web of Science: | Yes | |||||||||
| Volume: | 7 | |||||||||
| DOI : | 10.5194/gmd-7-695-2014 | |||||||||
| Page Range: | pp. 695-709 | |||||||||
| Publisher: | Copernicus Publications | |||||||||
| ISSN: | 1991-959X | |||||||||
| Status: | Published | |||||||||
| Keywords: | particle-based microphysics, Lagrangian microphyiscs, contrail, cirrus, nucleation, Large-eddy simulation | |||||||||
| HGF - Research field: | Aeronautics, Space and Transport | |||||||||
| HGF - Program: | Aeronautics | |||||||||
| HGF - Program Themes: | ATM and Operation (old) | |||||||||
| DLR - Research area: | Aeronautics | |||||||||
| DLR - Program: | L AO - Air Traffic Management and Operation | |||||||||
| DLR - Research theme (Project): | L - Climate, Weather and Environment (old) | |||||||||
| Location: | Oberpfaffenhofen | |||||||||
| Institutes and Institutions: | Institute of Atmospheric Physics > Transport Meteorology | |||||||||
| Deposited By: | Unterstraßer, Dr. Simon | |||||||||
| Deposited On: | 30 Apr 2014 18:14 | |||||||||
| Last Modified: | 02 May 2019 14:14 |
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