Advances in Overset CFD Processes Applied to Subsonic High-Lift Aircraft
A number of grid-generation and CFD-process software tools have been developed which greatly improve the ability to perform overset CFD analysis of complex configurations. These tools have been applied to the task of generating grids and computing the ow field about two different high-lift aircraft configured for landing: a Boeing 777-200, and a High-Wing Transport with externally blown apps. The high-lift ow-fields of both aircraft were simulated using the OVERFLOW solver. A Navier-Stokes simulation of a complete Boeing 777-200 aircraft configured for landing was obtained in less than 50 labor days with a lift coefficient that differs from experimental data by only 1.2%. This is an order-of-magnitude reduction in the cycle time for the entire computational process compared to a similar high-lift simulation effort that took place two years earlier. The new software was utilized to perform an on-field analysis of an ap-rigging modification for the Boeing 777-200 aircraft in only four days. The software was also utilized to simplify the grid generation of the High-Wing Transport for many different geometric configurations. The reductions in computational cycle time are primarily the result of the use of an automatic script system that streamlines the overset grid preparation process. Analysis of the process shows that over-setting the grid system is now the most labor-intensive part of a single-point analysis; however, for multi-point analyses, multiple viscous ow-solver runs are costly.
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