DC FieldValueLanguage
dc.contributor.authorBreuer, Michael-
dc.contributor.authorJaffrézic, Benoit-
dc.contributor.authorArora, K.-
dc.date.accessioned2020-06-16T07:41:50Z-
dc.date.available2020-06-16T07:41:50Z-
dc.date.issued2008-
dc.identifier.issn09354964-
dc.description.abstractIn order to reduce the high computational effort of wall-resolved large-eddy simulations (LES), the present paper suggests a hybrid LES-RANS approach which splits up the simulation into a near-wall RANS part and an outer LES part. Generally, RANS is adequate for attached boundary layers requiring reasonable CPU-time and memory, where LES can also be applied but demands extremely large resources. Contrarily, RANS often fails in flows with massive separation or large-scale vortical structures. Here, LES is without a doubt the best choice. The basic concept of hybrid methods is to combine the advantages of both approaches yielding a prediction method, which, on the one hand, assures reliable results for complex turbulent flows, including large-scale flow phenomena and massive separation, but, on the other hand, consumes much fewer resources than LES, especially for high Reynolds number flows encountered in technical applications. In the present study, a non-zonal hybrid technique is considered (according to the signification retained by the authors concerning the terms zonal and non-zonal), which leads to an approach where the suitable simulation technique is chosen more or less automatically. For this purpose the hybrid approach proposed relies on a unique modeling concept. In the LES mode a subgrid-scale model based on a one-equation model for the subgrid-scale turbulent kinetic energy is applied, where the length scale is defined by the filter width. For the viscosity-affected near-wall RANS mode the one-equation model proposed by Rodi et al. (J Fluids Eng 115:196-205, 1993) is used, which is based on the wall-normal velocity fluctuations as the velocity scale and algebraic relations for the length scales. Although the idea of combined LES-RANS methods is not new, a variety of open questions still has to be answered. This includes, in particular, the demand for appropriate coupling techniques between LES and RANS, adaptive control mechanisms, and proper subgrid-scale and RANS models. Here, in addition to the study on the behavior of the suggested hybrid LES-RANS approach, special emphasis is put on the investigation of suitable interface criteria and the adjustment of the RANS model. To investigate these issues, two different test cases are considered. Besides the standard plane channel flow test case, the flow over a periodic arrangement of hills is studied in detail. This test case includes a pressure-induced flow separation and subsequent reattachment. In comparison with a wall-resolved LES prediction encouraging results are achieved. © 2007 Springer-Verlag.de_DE
dc.description.sponsorshipStrömungsmechanikde_DE
dc.language.isoen_USde_DE
dc.publisherSpringerde_DE
dc.relation.ispartofTheoretical and Computational Fluid Dynamicsde_DE
dc.subject.ddcDDC - Dewey Decimal Classification::000 Informatik, Wissen, Systemede_DE
dc.subject.ddcDDC - Dewey Decimal Classification::400 Sprachede_DE
dc.subject.ddcDDC - Dewey Decimal Classification::600 Technikde_DE
dc.titleHybrid LES-RANS technique based on a one-equation near-wall modelde_DE
dc.typeArticlede_DE
dc.identifier.doi10.1007/s00162-007-0067-9-
dc.identifier.scopus2-s2.0-43049130339-
hsu.accessrights.dnbfreede_DE
dcterms.bibliographicCitation.volume22de_DE
dcterms.bibliographicCitation.issue3/4de_DE
dcterms.bibliographicCitation.pagestart157de_DE
dcterms.bibliographicCitation.pageend187de_DE
dcterms.bibliographicCitation.originalpublisherplaceHeidelbergde_DE
dc.identifier.urlhttps://api.elsevier.com/content/abstract/scopus_id/43049130339-
local.submission.typeonly-metadatade_DE
item.grantfulltextnone-
item.fulltext_sNo Fulltext-
item.languageiso639-1en_US-
item.fulltextNo Fulltext-
item.openairetypeArticle-
crisitem.author.deptStrömungsmechanik-
crisitem.author.orcid0000-0003-4467-478X-
crisitem.author.parentorgFakultät für Maschinenbau und Bauingenieurwesen-
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