3-DIMENSIONAL TIME-MARCHING AEROELASTIC ANALYSES USING AN UNSTRUCTURED-GRID EULER METHOD

Modifications to a three-dimensional, implicit, upwind, unstructured-g rid Euler code for seroelastic analysis of complete aircraft configura tions are described. The modifications involve the addition of the str uctural equations of motion for their simultaneous time integration wi th the governing flow equations. The paper presents a detailed descrip tion of the time-marching seroelastic procedures and presents comparis ons with experimental data to provide an assessment of the capability. Flutter results are shown for an isolated 45-deg swept-back wing and a supersonic transport configuration with a fuselage, clipped delta wi ng, and two identical rearward-mounted engine nacelles. Comparisons ar e made between computed and experimental flutter characteristics to as sess the accuracy of the aeroelastic results.