Abstract
Longitudinal vortex system was produced by a three-dimensional delta wing. The wing with attack angle of 15 degrees was merged in the uniform flow speed of 150 km/h. CFD clarified the structure of longitudinal vortex and the characteristics of wing surface-pressure fluctuation caused by longitudinal vortex. As a result, it was found that the rotational velocity, the pressure coefficient and the vorticity have their largest values at the tip of the vortex and reduce downstream along the vertical axis. The pressure coefficient and vorticity distributions presented the possibility that the longitudinal vortex consists of some vortices. Moreover, CFD revealed that dipole source associated with surface-pressure fluctuation time-derivative has maximum value at the tip of the wing.
