Large Eddy Simulation of Turbulent Flow Over an Airfoil Using Both Structured and Unstructured Grids
Final technical rept. 1 Aug 96-30 Nov 97
STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING
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This report describes the application of Large Eddy Simulations LES to turbulent flow over an airfoil. Two different approaches have been used, a second-order finite-difference solver on structured grid and a finite-element solver on unstructured grid. Results are presented for the flow around a NACA 4412 airfoil at maximum lift. The diversity of flow characteristics encountered in this flow include laminar, transitional and turbulent boundary layers, flow separation, unstable free shear layers and a wake. while Reynolds-averaged Navier-Stokes simulations RANS have had some success when tuned to flows dominated by one such flow characteristic, this variety of flow features taxes the presently available RANS models and presents an excellent opportunity to validate the utility of the dynamic SGS model for LES. Work has also been conducted on high order methods, both for the unstructured and the structured approach.
- Fluid Mechanics