Collaborative Aircraft Design Methodology using ADAS linked to CEASIOM

The aircraft design stages, conceptual and preliminary, are necessarily collaborative by their very nature. An example design carried out in this paper brings the collaborative aspects of design to life by two academic groups, one in Naples and one in Stockholm, using their own tools ADAS and CEASIOM, working respectively on conceptual and preliminary design. The ADAS tool is primarily empirically-based design methodology, and the CEASIOM tool is primarily physics-based design methodology. The example chosen is a FAR-23 compliant 16-seat twin turboprop aircraft. The high-wing conguration resulting from the ADAS conceptual design is the down-selected to CEASIOM where a water-tight model of the geometry is constructed, a volume grid is generated and 16 ight conditions are simulated by solutions of the Euler equations, some with propeller o, and others with propeller in order to judge the eect of the propeller wash over the main wing and horizontal tail surface. Detailed comparisons between ADAS results and CEASIOM results for stability & control characteristics are carried out. In general there is reasonable agreement between the two sets, considering that the empiricisms in ADAS account for viscous eects where as the CEASIOM are purely inviscid (but nonlinear). The largest discrepancy appears in the pitching moment contribution from the horizontal tail, and various explanations for this are suggested, including possible eects of the main wing downwash and wake on the tail.