TURBULENT FLOW IN A DIFFERENTIALLY HEATED CAVITY: DIRECT NUMERICAL SIMULATION AND REGULARIZATION MODELING

被引:0
作者
Xavier Trias, F. [1 ]
Gorobets, Andrey [1 ]
Oliva, Assensi [1 ]
Verstappen, Roel
机构
[1] Tech Univ Catalonia, Ctr Tecnol Transferencia Calor, Barcelona 08222, Spain
来源
PROCEEDINGS OF THE ASME INTERNATIONAL HEAT TRANSFER CONFERENCE - 2010, VOL 7: NATURAL CONVECTION, NATURAL/MIXED CONVECTION, NUCLEAR, PHASE CHANGE MATERIALS, SOLAR | 2010年
关键词
THERMAL-CONVECTION; NATURAL-CONVECTION; SCALES;
D O I
暂无
中图分类号
O414.1 [热力学];
学科分类号
摘要
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 = 1 + Sigma(M)(m=1) d(m)(D) over tilde (m) where (D) over tilde is the discrete diffusive operator. Then, the coefficients, d(m) follow from the requirement that, at the smallest grid scale k(c), the damping effect to the wavevector-triple (k(c), p, k(c) - 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.
引用
收藏
页码:163 / 172
页数:10
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