A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0

Show simple item record

dc.identifier.uri http://dx.doi.org/10.15488/12408
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/12507
dc.contributor.author Hellsten, Antti
dc.contributor.author Ketelsen, Klaus
dc.contributor.author Sühring, Matthias
dc.contributor.author Auvinen, Mikko
dc.contributor.author Maronga, Björn
dc.contributor.author Knigge, Christoph
dc.contributor.author Barmpas, Fotios
dc.contributor.author Tsegas, Georgios
dc.contributor.author Moussiopoulos, Niolas
dc.contributor.author Raasch, Siegfried
dc.date.accessioned 2022-07-04T05:03:56Z
dc.date.available 2022-07-04T05:03:56Z
dc.date.issued 2021
dc.identifier.citation Hellsten, A.; Ketelsen, K.; Sühring, M.; Auvinen, M.; Maronga, B. et al.: A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0. In: Geoscientific Model Development 14 (2021), Nr. 6, S. 3185-3214. DOI: https://doi.org/10.5194/gmd-14-3185-2021
dc.description.abstract Large-eddy simulation (LES) provides a physically sound approach to study complex turbulent processes within the atmospheric boundary layer including urban boundary layer flows. However, such flow problems often involve a large separation of turbulent scales, requiring a large computational domain and very high grid resolution near the surface features, leading to prohibitive computational costs. To overcome this problem, an online LES-LES nesting scheme is implemented into the PALM model system 6.0. The hereby documented and evaluated nesting method is capable of supporting multiple child domains, which can be nested within their parent domain either in a parallel or recursively cascading configuration. The nesting system is evaluated by first simulating a purely convective boundary layer flow system and then three different neutrally stratified flow scenarios with increasing order of topographic complexity. The results of the nested runs are compared with corresponding non-nested high-and low-resolution results. The results reveal that the solution accuracy within the high-resolution nest domain is clearly improved as the solutions approach the non-nested high-resolution reference results. In obstacle-resolving LES, the two-way coupling becomes problematic as anterpolation introduces a regional discrepancy within the obstacle canopy of the parent domain. This is remedied by introducing canopy-restricted anterpolation where the operation is only performed above the obstacle canopy. The test simulations make evident that this approach is the most suitable coupling strategy for obstacle-resolving LES. The performed simulations testify that nesting can reduce the CPU time up to 80 % compared to the fine-resolution reference runs, while the computational overhead from the nesting operations remained below 16 % for the two-way coupling approach and significantly less for the one-way alternative. © 2021 Antti Hellsten et al. eng
dc.language.iso eng
dc.publisher Katlenburg-Lindau : Copernicus
dc.relation.ispartofseries Geoscientific Model Development 14 (2021), Nr. 6
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject climate modeling eng
dc.subject detection method eng
dc.subject large eddy simulation eng
dc.subject.ddc 910 | Geografie, Reisen ger
dc.title A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0
dc.type Article
dc.type Text
dc.relation.essn 1991-9603
dc.relation.issn 1991-959X
dc.relation.doi https://doi.org/10.5194/gmd-14-3185-2021
dc.bibliographicCitation.issue 6
dc.bibliographicCitation.volume 14
dc.bibliographicCitation.firstPage 3185
dc.bibliographicCitation.lastPage 3214
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

Files in this item

This item appears in the following Collection(s):

Show simple item record


Search the repository


My Account

Usage Statistics