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Títol: Turbulent flow in a differentially heated cavity: direct numérical simulation and regularization modeling
Autor: Trias Miquel, Francesc Xavier
Gorobets, Andrei
Oliva Llena, Asensio
Verstappen, R.W.C.P.
Altres autors/autores: Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
Matèries: Àrees temàtiques de la UPC::Física::Termodinàmica::Física de la transmissió de la calor
Turbulent flows
Fluids -- Models matemàtics
Tipus de document: Conference lecture
Descripció: We consider regularizations of the convective term that preserve symmetry and conservation properties exactly. This yields a novel class of regularizations that restrain the convective production of small scales in an unconditionally stable manner Numerically, one of the most critical issues is the discrete filtering; properties required are, in general, not preserved by classical LES filters. Alternatively, here we propose to construct filters with the general form F = I + ΣMm =1 dm ˜Dm where ˜D is the discrete diffusive operator. Then, the coefficients, dm, follow from the requirement that, at the smallest grid scale kc, the damping effect to the wavevector-triple (kc, p,kc− p) interactions must be virtually independent of the p-th Fourier-mode. This allows an optimal control of the subtle balance between convection and diffusion to stop the vortex-stretching. Finally, the proposed method is tested for an air-filled differentially heated cavity of aspect ratio 4 by direct comparison with DNS reference results.
Altres identificadors i accés: Trias, F. [et al.]. Turbulent flow in a differentially heated cavity: direct numérical simulation and regularization modeling. A: International Heat Transfer Conference. "14th International Heat Transfer Conference". Washington, DC: 2010, p. 1-10.
9780791838792
http://hdl.handle.net/2117/12113
Disponible al dipòsit:E-prints UPC
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