Accession Number:

ADA503531

Title:

A Computational Framework Based on Variational LES Method for the Multi-Disciplinary Analysis of MAVS With Flapping Wings

Descriptive Note:

Conference paper

Corporate Author:

STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING

Report Date:

2008-12-01

Pagination or Media Count:

8.0

Abstract:

In this paper the three level formulation of a variational multi-scale VMS large eddy simulation LES method for compressible flow computations is extended for applications involving movingdeforming grids. A consistent method to improve the VMS-LES constant dynamically as the flow develops dynamic VMS-LES is also extended for dynamic grid applications. Two applications of VMS-LES for the simulation of separated flow over moving NACA-0012 extruded airfoil is then presented. The first application involves a qualitative simulation exploring the Knoller-Betz effect of the heaving airfoil at high Strouhal number. The second application is that of the pitching airfoil undergoing dynamic stall. The results predicted by the dynamic VMS-LES method are compared to those obtained with other turbulence models and to experimental data and it is found that the dynamic VMS-LES performs better than the other considered static and dynamic LES models.

Subject Categories:

  • Aerodynamics
  • Theoretical Mathematics
  • Fluid Mechanics
  • Military Operations, Strategy and Tactics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE