A method to estimate buffeting loads on lifting surfaces immersed in turbulent streams using steady Reynoldsaveraged Navier-Stokes equation solutions is presented. A generalization of a model developed by Liepmann ("On the Application of Statistical Concepts to the Buffeting Problem," Journal of the Aeronautical Sciences, Vol. 19, No. 12, Dec. 1952, pp. 793-800.) that is based on thin airfoil theory and statistical concepts is employed.Mean flow and turbulence-derived quantities required by the method are supplied by steady Reynolds-averaged Navier-Stokes equation model data. The shear-stress transport turbulence model is used here. The predictive capability of the method is assessed by comparison to unsteady turbulence simulations of the stream buffeting the lifting surface. A half-step is also taken wherein turbulence simulation results are used to close the Liepmann model, allowing that model's performance to be isolated from the impact of using a Reynolds-averaged Navier-Stokes model. The E-2D Advanced Hawkeye rotodome exposed to a compressible turbulent plume is used as a test case. The half-step results show that the Liepmann model itself performs well when both the upper and lower surfaces of the rotodome are within the stream. Estimates obtained using steady Reynolds-averaged Navier-Stokes equation-based results within the Liepmann model compare less favorably due to mean flow prediction differences. But, they are reasonable and have been found to be useful in an environment where a large number of cases needs to be quickly analyzed.
All Science Journal Classification (ASJC) codes
- Aerospace Engineering