Accession Number:

ADP013620

Title:

LES Overview

Descriptive Note:

Conference paper

Corporate Author:

POLITECNICO DI TORINO (ITALY) DEPT DI INGEGNERIA AERONAUTICA E SPAZIALE

Personal Author(s):

Report Date:

2001-08-01

Pagination or Media Count:

12.0

Abstract:

In the paper the different current approaches to the Large Eddy Simulations of turbulent flows are examined and critically discussed. A LES is usually defined as a numerical computation in which some scales are captured and others are modelled, but different procedures are used for such decomposition. As regards the modeling of the unresolved scales they are in the paper tentatively classified as exact modeling and statistical modeling. A third procedure, the dynamic modeling is examined as a technique based on the use of general relations that connect the subgrid scale turbulent stresses at different levels. Their implementation to standard models like the Smagoriusky eddy viscosity one, can improve the results and can efficiently extend the range of their application. The connections between LES and RANS, the simulations based on the Reynolds Averaged Navier-Stokes equations, are finally examined and some critical issues related to the extraction of the statistical averages from LES databases are discussed.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE