Second Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP2
NUMERICAL SIMULATIONS OF THE LAGRANGIAN AVERAGED NAVIER-STOKES (LANS-α) EQUATIONS
pages 161-166
DOI: 10.1615/TSFP2.1900
ABSTRACT
We examine the modeling capabilities of the Lagrangian-Averaged Navier-Stokes (LANS-α) equations for decaying homogeneous turbulence. Direct Numerical Simulation (DNS) of the Navier-Stokes equations is performed with an initial Taylor Reynolds number of 220. The predictive capability of the LANS-α equations is analyzed by comparison of the numerical solution of the LANS-α equations with the Large Eddy Simulation (LES) and the DNS data. The LANS-α equations accurately predict the total kinetic energy decay and the time evolution of the energy spectra as long as a minimum resolution is met.