21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-2.3.3

USE OF CFD FOR DESIGN VALIDATION OF A TRANSONIC CIVIL TRANSPORT

Ok H., Kim I., Choi S., Sung B.
Korea Aerospace Research Institute, Korea

Keywords: cfd, transonic civil aircraft, design

The applications of CFD in the design process of a transonic civil transport at Korea Aerospace Research Institute (KARI) are outlined. Three Navier-Stokes solvers, developed at KARl with different grid approaches, are used to predict the aerodynamic coefficients and solve the flow field of various configurations. Multi-block, Chimera, and unstructured grids are the approaches implemented. The accuracy of the codes is verified for the transonic flow about RAE wing/fuselage configuration. The multi-block code is used to provide the detailed data on the flow field around a wall interference model with different test section sizes which will be used in establishing the wall interference correction method. The subsonic and transonic flow fields about KIOO-04A, one of the configurations of a 100seater transport developed by KARI and Korea Commercial Aircraft Development Consortium (KCDC), are computed to predict the aerodynamic coefficients. The results for the subsonic flow are compared with those of wind tunnel test, and the agreement is found to be excellent. The interference effect of nacelle installation on the wing of KIOO-04A is also investigated using the unstructured grid method, and about 10% reduction in wing lift is observed. The accuracy of the three developed codes is verified, and they are used as an efficient tool in the design process of a transonic transport.

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