The role of the Orthogonal Sub-Grid Scales - Variational Multi-Scale (OSGS-VMS) method in describing the Burgers "turbulence" phenomena

by Camilo Bayona (CIMNE)

Wednesday, May 31st, 2017 - 15h

O.C. Zienkiewicz Room, C1, Campus Nord UPC, Barcelona

Abstract

The Orthogonal Sub-Grid Scales-Variational Multi-Scale (OSGS-VMS) method can accurately approximate Burgers "turbulence" (a highly simplified version of the incompressible Navier–Stokes turbulence), only with the addition of purely dissipative numerical terms. The analysis of a one-dimensional Burgers equation in the Fourier space allows to clarify the scale dependence of the numerical diffusion introduced by the OSGS-VMS method. In particular, results can be contrasted with Direct Numerical Simulations (DNS) and with a spectral Large Eddy Simulation (LES).

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