one or more lifting surfaces can be attached to a fuselage by means of features called "anchors". an anchor is a set of slender panels that belong to the fuselage and serve as a bridge between the root of a wing and the panels of the fuselage. anchors are needed to provide a transition in the circulation of both surfaces, i.e., to properly model a physical connection between both of them. without anchors, the gap between the two surfaces would leak, creating regions of very high airspeed and a consequent wrong prediction of the air-loads.