Numerical Investigation of Stall Flutter
MetadataShow full item record
Unsteady, separated, high Reynolds number flow over an airfoil undergoing oscillatory motion is investigated numerically. The compressible form of the Reynolds-averaged governing equations is solved using a high-order, upwind biased numerical scheme. The turbulent flow region is computed using a one-equation turbulence model. The computed results show that the key to the accurate prediction of the unsteady loads at stall flutter conditions is the modeling of the transitional flow region at the leading edge. A simplified criterion for the transition onset is used. The transitional flow region is computed with a modified form of the turbulence model. The computed solution, where the transitional flow region is included, shows that the small laminar/transitional separation bubble forming during the pitch-up motion has a decisive effect on the near-wall flow and the development of the unsteady loads. Detailed comparisons of computed fully turbulent and transitional flow solutions with experimental data are presented.
Showing items related by title, author, creator and subject.
Experimental and computational analysis of separation bubble behavior for compressible, steady and oscillatory flows over a NACA 0012 airfoil at M=0.3 and a reynolds number of 540,000. Van Dyken, Robert D. (Monterey, California. Naval Postgraduate School, 1997-03);In this thesis, the separation bubble behavior and its effect on the steady and dynamic stall characteristics of a thin airfoil in a compressible flow at a transitional Reynolds number was studied. For such flows, laminar ...
Ekaterinaris, J.A.; Chandrasekhara, M.S.; Platzer, M.F. ;Compressible steady and unsteady flowfields over a NACA 0012 airfoil at transitional Reynolds numbers are investigated. Comparisons with recently obtained experimental data are used to evaluate the ability of a ...
Systematic and integrated approach to tropical cyclone track forecasting in the eastern and central North Pacific White, Sean R. (Monterey, California. Naval Postgraduate School, 1995-12);This study is the application of the meteorological framework in the Systematic Approach to tropical cyclone track forecasting of Carr and Elsberry to the eastern and central North Pacific tropical cyclones. All eastern ...