Application of the Subsonic Doublet Lattice Method to Delta Wings

摘要

THE subsonic doublet lattice method (DLM)~1-3 is commonly used for the calculation of unsteady airloads on aircraft. This method can be regarded as an extension of the vortex lattice method (VLM) that is widely used for steady load calculation. In both of these methods a lifting surface is divided into a number of smaller panels or boxes. A lifting line and a collocation point is associated with each box. The lift force acting on each box is assumed to act at the lifting line, whereas the boundary condition of tangential ve- locity is enforced at the collocation point.