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

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 moving/deforming 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.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2008
Accession Number
ADA503531

Entities

People

  • Ajaykumar Rajasekharan
  • Charbel Farhat

Organizations

  • Stanford University

Tags

Communities of Interest

  • Autonomy

DTIC Thesaurus Topics

  • Abstracts
  • Compressible Flow
  • Computational Fluid Dynamics
  • Experimental Data
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Information Operations
  • Instructions
  • Large Eddy Simulation
  • Simulations
  • Strouhal Number

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Mechanics and Fluid Dynamics.
  • Underwater engineering and Marine Technology.