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Unterstrasser, Simon und Sölch, Ingo (2014) Optimisation of simulation particle number in a Lagrangian ice microphysical model. Geoscientific Model Development, 7, Seiten 695-709. Copernicus Publcations. DOI: 10.5194/gmd-7-695-2014 ISSN 1991-959X
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Offizielle URL: http://www.geosci-model-dev.net/7/695/2014/
Kurzfassung
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.
| Dokumentart: | Zeitschriftenbeitrag | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Titel: | Optimisation of simulation particle number in a Lagrangian ice microphysical model | |||||||||
| Autoren: |
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| Datum: | 2014 | |||||||||
| Erschienen in: | Geoscientific Model Development | |||||||||
| Referierte Publikation: | Ja | |||||||||
| In Open Access: | Ja | |||||||||
| In SCOPUS: | Ja | |||||||||
| In ISI Web of Science: | Ja | |||||||||
| Band: | 7 | |||||||||
| DOI : | 10.5194/gmd-7-695-2014 | |||||||||
| Seitenbereich: | Seiten 695-709 | |||||||||
| Verlag: | Copernicus Publcations | |||||||||
| ISSN: | 1991-959X | |||||||||
| Status: | veröffentlicht | |||||||||
| Stichwörter: | particle-based microphysics, Lagrangian microphyiscs, contrail, cirrus, nucleation, Large-eddy simulation | |||||||||
| HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | |||||||||
| HGF - Programm: | Luftfahrt | |||||||||
| HGF - Programmthema: | ATM und Flugbetrieb (alt) | |||||||||
| DLR - Schwerpunkt: | Luftfahrt | |||||||||
| DLR - Forschungsgebiet: | L AO - Luftverkehrsmanagement und Flugbetrieb | |||||||||
| DLR - Teilgebiet (Projekt, Vorhaben): | L - Klima, Wetter und Umwelt (alt) | |||||||||
| Standort: | Oberpfaffenhofen | |||||||||
| Institute & Einrichtungen: | Institut für Physik der Atmosphäre > Verkehrsmeteorologie | |||||||||
| Hinterlegt von: | Unterstraßer, Dr. Simon | |||||||||
| Hinterlegt am: | 30 Apr 2014 18:14 | |||||||||
| Letzte Änderung: | 08 Mär 2018 18:29 |
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