A variational multiscale method for incompressible turbulent flows: Bubble functions and fine scale fields

作者：Masud Arif^*; Calderer Ramon

来源：Computer Methods in Applied Mechanics and Engineering, 2011, 200(33-36): 2577-2593.

DOI：10.1016/j.cma.2011.04.010

• Residual-based turbulence model
• Variational multiscale method
• Large eddy simulation
• Stabilized finite elements
• Turbulence modeling
• Bubble functions

This paper presents a residual-based turbulence model for the incompressible Navier-Stokes equations. The method is derived employing the variational multiscale (VMS) framework. A multiscale decomposition of the continuous solution and a priori unique decomposition of the admissible spaces of functions lead to two coupled nonlinear problems termed as the coarse-scale and the fine-scale sub-problems. The fine-scale velocity field is assumed to be nonlinear and time-dependent and is modeled via the bubble functions approach applied directly to the fine-scale sub-problem. A significant contribution in this paper is a systematic and consistent derivation of the fine-scale variational operator, commonly termed as the stabilization tensor that possesses the right order in the advective and diffusive limits, and variationally projects the fine-scale solution onto the coarse-scale space. A direct treatment of the fine-scale problem via bubble functions offers several fine-scale approximation options with varying degrees of mathematical sophistication that are investigated via benchmark problems. Numerical accuracy of the proposed method is shown on a forced-isotropic turbulence problem, statistically stationary turbulent channel flow problems at Re(T) = 395 and 590, and non-equilibrium turbulent flow around a cylinder at Re = 3,900.

• 出版日期2011