Grid generation for complex high-lift configurations

Abstract

An effort to develop and integrate grid-generation and flow-solver tools capable of computing the flow over a commercial subsonic aircraft in a high-lift configuration is described. An overset-grid approach is utilized. Surface grids are generated using the Boeing Aero-Grid-and-Paneling-System plus the NASA Chimera-Grid-Tools package. Volume grids are efficiently generated using new enhancements to the HYPGEN hyperbolic-grid program and a new localelliptic grid generator. The overset grids are linked together using the PEGASUS software and automatically generated hole-cutting surfaces, which are necessary for dealing with the small gaps between high-lift elements. The grid-generation system is applied to a Boeing 747PD high-lift configuration, and the flow field is computed using the OVERFLOW program. The computed lift-coefficient result for an angle-ofattack of 8 deg is in agreement with an experimental value.