A Computational Framework Based on Variational LES Method for the Multi-Disciplinary Analysis of MAVS With Flapping Wings
STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING
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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.
- Theoretical Mathematics
- Fluid Mechanics
- Military Operations, Strategy and Tactics