NUMERICAL INVESTIGATION OF THE STALL ONSET BEHAVIOR OF THE GA(W)-1 AIRFOIL

In this paper the stall onset behaviour of the GA(W)-1 airfoil is nume rically investigated. The compressible form of the Reynolds-averaged N avier-Stokes equations is solved with an upwind-biased numerical schem e. An algebraic and a one-equation turbulence model are compared in th eir ability of predicting stall onset and highly separated flow. The r esults show significant differences at higher angles of attack and the ability of the one-equation model to predict the maximum lift coeffic ient. The magnitude and the frequency of the normal force fluctuations are also calculated and compared with the buffeting prediction as des cribed by Mabey (1992). (C) 1998 Elsevier Science Ltd. All rights rese rved.