A variational multiscale method for the large eddy simulation of compressible turbulent flows on unstructured meshes––application to vortex shedding

2004 ◽  
Vol 193 (15-16) ◽  
pp. 1367-1383 ◽  
Author(s):  
Bruno Koobus ◽  
Charbel Farhat
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flows ◽  
Vortex Shedding ◽  
Unstructured Meshes ◽  
Multiscale Method ◽  
Variational Multiscale Method ◽  
Variational Multiscale ◽  
Eddy Simulation ◽  
Large Eddy

A POD-Based Variational Multiscale Method for Large Eddy Simulation of Turbulent Channel Flows

2016 ◽  
Vol 14 (05) ◽  
pp. 1750049 ◽  
Author(s):  
Lin-Feng Chen ◽  
Xu-Qu Hu
Keyword(s):  
Large Eddy Simulation ◽  
Stokes Equations ◽  
Multiscale Method ◽  
Channel Flows ◽  
Variational Multiscale Method ◽  
Variational Multiscale ◽  
Eddy Simulation ◽  
Turbulent Channel Flows ◽  
Turbulent Characteristics ◽  
Large Eddy

A POD-based variational multiscale method (VMM) for large eddy simulation (LES) of turbulent channel flows is proposed. The incompressible Navier–Stokes equations are solved using a residual-based VMM technique, and the residual-based model coefficient is adopted from Taylor et al. [1998] “Finite element modeling of blood flow in arteries,” Comput. Methods in Appl. Mech. Eng. 158(1–2), 155–196. A generalized-[Formula: see text] method is applied for the temporal integration. Numerical results show that four or higher wall-normal modes need to be applied for reproducing most of the turbulent characteristics. Results of large vortex structures and the low velocity streaks prove that the turbulent channel flows are well estimated by the proposed approach. The statistical analysis of the turbulent velocities confirms its reliability in turbulent channel flows.

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