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dc.contributor.authorFolch Flórez, David
dc.contributor.authorTrias Miquel, Francesc Xavier
dc.contributor.authorGorobets, Andrei
dc.contributor.authorOliva Llena, Asensio
dc.contributor.otherUniversitat Politècnica de Catalunya. Doctorat en Enginyeria Tèrmica
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
dc.date.accessioned2021-11-26T15:12:51Z
dc.date.available2021-11-26T15:12:51Z
dc.date.issued2021
dc.identifier.citationFolch, D. [et al.]. Subgrid-Scale Model Based on the Invariants of the Gradient Model Tensor. A: European Congress on Computational Methods in Applied Sciences and Engineering. "14th World Congress on Computational Mechanics (WCCM), ECCOMAS Congress 2020): virtual congress: 11-15 January 2021". 2021, p. 1-8.
dc.identifier.urihttp://hdl.handle.net/2117/357185
dc.description.abstractThe incompressible Navier-Stokes equations stand as the best mathematical model for turbulent flows. However, direct numerical simulations at high Reynolds numbers are not yet feasible because the convective term produces far too many relevant scales of motion, thus remaining limited to relatively low-Reynolds numbers. Dynamically less complex mathematical formulations have been developed for coarse-grain simulations, like the well known eddy-viscosity models. Most of these models are based on the combination of invariants of a symmetric tensor that depends on the gradient of the resolved velocity field, G = Ñu, and should properly detect different flow configurations (laminar and 2D flows, near-wall behavior, transitional regime, etc.). Brand-new models have been constructed considering the first three invariants of the symmetric tensor GGT with excellent results;1 hence, it is formally based on the lowest-order approximation of the subgrid stress tensor, t(u) = D2 12GGT +O(D4), i.e. the gradient model proposed by Clark.2 Furthermore, these models have been implemented on a pseudo-spectral algorithm with a fully-explicit second-order time-integration method.3 The performance of this special configuration has been successfully tested for decaying isotropic turbulence and a turbulent channel flow. It is currently being developed for a semi-infinite boundary layer with periodic conditions as a previous step to carry out wind farm simulations. Details of the implementation and numerical results will be presented.
dc.description.sponsorshipThe work has been financially supported by a competitive R+D project (ENE2017-88697-R) by the Spanish Research Agency. The authors thankfully acknowledge these institutions.
dc.format.extent8 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 Unported
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
dc.subject.lcshTurbulence
dc.subject.lcshFluid dynamics
dc.subject.otherLES
dc.subject.otherSGS models
dc.subject.otherGradient model
dc.subject.otherTurbulence
dc.titleSubgrid-Scale Model Based on the Invariants of the Gradient Model Tensor
dc.typeConference report
dc.subject.lemacTurbulència
dc.subject.lemacDinàmica de fluids
dc.contributor.groupUniversitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor
dc.relation.publisherversionhttps://www.scipedia.com/public/Folch_et_al_2021a
dc.rights.accessOpen Access
local.identifier.drac32010366
dc.description.versionPostprint (published version)
dc.relation.projectidinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2017-88697-R/ES/ALGORITMOS NUMERICOS AVANZADOS PARA LA MEJORA DE LA EFICIENCIA ENERGETICA EN LOS SECTORES EOLICO Y SOLAR-TERMICO: DESARROLLO%2FADAPTACION A NUEVAS ARQUITECTURAS COMPUTACIONALES/
local.citation.authorFolch, D.; Trias, F. X.; Gorobets, A.; Oliva, A.
local.citation.contributorEuropean Congress on Computational Methods in Applied Sciences and Engineering
local.citation.publicationName14th World Congress on Computational Mechanics (WCCM), ECCOMAS Congress 2020): virtual congress: 11-15 January 2021
local.citation.startingPage1
local.citation.endingPage8


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