Development of low-frequency kernel-function aerodynamics for comparison with time-dependent finite-difference methods

摘要: Finite difference methods for unsteady transonic flow frequency use simplified equations in which certain of the time dependent terms are omitted from governing equations. Kernel functions derived two dimensional subsonic flow, and provide accurate solutions linearized potential equation with same omitted. These make possible a direct evaluation finite codes linear problem. Calculations these low kernel verify accuracy LTRAN2 HYTRAN2 codes. Comparisons function results Possio solution complete indicate adequacy HYTRAN approximation frequencies range interest flutter calculations.