Mostra el registre d'ítem simple
Subgrid-Scale Model Based on the Invariants of the Gradient Model Tensor
dc.contributor.author | Folch Flórez, David |
dc.contributor.author | Trias Miquel, Francesc Xavier |
dc.contributor.author | Gorobets, Andrei |
dc.contributor.author | Oliva Llena, Asensio |
dc.contributor.other | Universitat Politècnica de Catalunya. Doctorat en Enginyeria Tèrmica |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics |
dc.date.accessioned | 2021-11-26T15:12:51Z |
dc.date.available | 2021-11-26T15:12:51Z |
dc.date.issued | 2021 |
dc.identifier.citation | Folch, 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.uri | http://hdl.handle.net/2117/357185 |
dc.description.abstract | The 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.sponsorship | The 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.extent | 8 p. |
dc.language.iso | eng |
dc.rights | Attribution-NonCommercial-ShareAlike 3.0 Unported |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US |
dc.subject | Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
dc.subject.lcsh | Turbulence |
dc.subject.lcsh | Fluid dynamics |
dc.subject.other | LES |
dc.subject.other | SGS models |
dc.subject.other | Gradient model |
dc.subject.other | Turbulence |
dc.title | Subgrid-Scale Model Based on the Invariants of the Gradient Model Tensor |
dc.type | Conference report |
dc.subject.lemac | Turbulència |
dc.subject.lemac | Dinàmica de fluids |
dc.contributor.group | Universitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor |
dc.relation.publisherversion | https://www.scipedia.com/public/Folch_et_al_2021a |
dc.rights.access | Open Access |
local.identifier.drac | 32010366 |
dc.description.version | Postprint (published version) |
dc.relation.projectid | info: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.author | Folch, D.; Trias, F. X.; Gorobets, A.; Oliva, A. |
local.citation.contributor | European Congress on Computational Methods in Applied Sciences and Engineering |
local.citation.publicationName | 14th World Congress on Computational Mechanics (WCCM), ECCOMAS Congress 2020): virtual congress: 11-15 January 2021 |
local.citation.startingPage | 1 |
local.citation.endingPage | 8 |