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dc.contributor.authorTrias Miquel, Francesc Xavier
dc.contributor.authorGorobets, Andrei
dc.contributor.authorVerstappen, R.W.C.P.
dc.contributor.authorOliva Llena, Asensio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
dc.date.accessioned2011-03-28T13:47:46Z
dc.date.available2011-03-28T13:47:46Z
dc.date.created2010
dc.date.issued2010
dc.identifier.citationTrias, F. [et al.]. Regularization modeling of wall-bounded turbulent flows. A: European Conference on Computational Fluid Dynamics. "Fifth European Conference on Computational Fluid Dynamics". Lisboa: 2010, p. 1-20.
dc.identifier.isbn978-989-96778-1-4
dc.identifier.urihttp://hdl.handle.net/2117/12118
dc.description.abstractSince direct numerical simulations cannot be computed at high Reynolds numbers, a dynamically less complex formulation is sought. In the quest for such a formulation, we consider regularizations of the convective term that preserve the symmetry and conservation properties exactly. This requirement yielded a novel class of regularizations (Computers & Fluids 37 (2008) 887) that restrain the convective production of smaller and smaller scales of motion in an unconditionally stable manner, meaning that the velocity cannot blow up in the energy-norm (in 2D also: enstrophy-norm). The numerical algorithm used to solve the governing equations must preserve the symmetry and conservation properties too. To do so, one of the most critical issues is the discrete filtering. The method requires a list of properties that, in general, are not preserved by classical filters for LES unless they are imposed a posteriori. In the present paper, we propose a novel class of discrete filters that preserves such properties per se. They are based on polynomial functions of the discrete diffusive operator, ˜D, with the general form F = I + PM m=1 dm ˜D m. Then, the coefficients, dm, follow from the requirement that, at the smallest grid scale kc, the amount by which the interactions between the wavevector-triples (kc, kc − q, q) are damped must become virtually independent of the q-th Fourier-mode. This allows an optimal control of the subtle balance between convection and diffusion at the smallest grid scale to stop the vortex-stretching. Finally, the proposed method is tested for an air-filled differentially heated cavity of height aspect ratio 4.
dc.format.extent20 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Física::Termodinàmica::Teoria cinètica
dc.subjectÀrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria
dc.subject.lcshComputational fluid dynamics
dc.subject.lcshTurbulent flows
dc.titleRegularization modeling of wall-bounded turbulent flows
dc.typeConference lecture
dc.subject.lemacMecànica de fluids computacional
dc.subject.lemacFluids -- Models matemàtics
dc.contributor.groupUniversitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://www.eccomas-cfd2010.org/index.php
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac5306982
dc.description.versionPostprint (published version)
local.citation.authorTrias, F.; Gorobets, A.; Verstappen, R.W.C.P.; Oliva, A.
local.citation.contributorEuropean Conference on Computational Fluid Dynamics
local.citation.pubplaceLisboa
local.citation.publicationNameFifth European Conference on Computational Fluid Dynamics
local.citation.startingPage1
local.citation.endingPage20


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