NUMERICAL SIMULATION AND MODELLING OF HIGH-LIFT AERODYNAMICS IN GROUND EFFECT

摘要

This paper presents the development of arnsimulation strategy for the numerical simulationrnand modelling of high-lift aerodynamics inrnground effect. The objective is to improve thernprediction accuracy of the ground effect usingrnCFD.rnThe simulation strategy is defined and validatedrnon a free-air test-case of a generic transportrnaircraft in landing configuration. In a first step,rna mesh study is performed to alleviate meshrndependency. In a second step, differentrnturbulence models are compared in order tornevaluate their applicability to high-lift flows. Inrnparticular, two standard linear eddy viscosityrnmodels (LEVM) are compared to an ExplicitrnAlgebraic Reynolds-Stress Model (EARSM).rnThe CFD solutions are examined in detail andrnvalidated against available data from windrntunnel tests. It is shown that the introduction ofrnvortical flow corrections to the LEVMsrnsignificantly improves the reproduction of thernlocal flow physics, as well as the prediction ofrnglobal aerodynamic coefficients. Similarrnimprovements have been obtained when usingrnthe EARSM model.rnThe developed simulation strategy is thenrnapplied to the ground effect. The influence ofrnthe ground effect on the local flow physics andrnon the global aerodynamic characteristics of thernaircraft is studied in detail.