ASSESSMENT OF EDDY VISCOSITY MODELS IN A RESIDUAL-BASED VARIATIONAL MULTISCALE FRAMEWORK

Resumo

Highly turbulent flows are present in several industrial applications and natural phenomena,
such as flows around aircraft airfoils and turbine blades, fluid-structure interaction problems in offshore
platforms and formation of turbidity currents. In this work, a general family of eddy viscosity models
(EVM) for the large-eddy simulation (LES) of turbulence is implemented in an edge-based stabilized
finite element incompressible Navier-Stokes solver within the framework of the residual-based
variational multiscale method (RB-VMS). We evaluate and compare the different fine-scale eddy
viscosity models proposed by Oberai and Hughes. These models are incorporated into EdgeCFD, a
highly optimized fully implicit parallel edge-based code, with inexact Newton solver and adaptive time
step. The performance and accuracy of the proposed models are tested with validation problems for high
Reynolds numbers. Results are then compared to those of highly resolved numerical simulations and
experimental data and discussed.