Abstract:
Two methods are presented
characteristics of bodies
SUMMARY
for predicting the aerodynamic
in inviscid and irrotational flow.
The first method is limited to incompressible flow and makes
use of panels of ring sources to approximate the body surface.
The technique is dedicated to single, axisymmetric body
configurations in either uniform longitudinal or rectilinear
motion. The versatility of the method is due to the use of
sources as singularities placed on the body surface, allowing
discontinuous body profiles to be analysed. The method has
been compared for accuracy and efficiency with experimental and
theoretical results.
Further investigation showed that at present there existed no
numerical technique which could predict the aerodynamic
behaviour of multiple bodies in compressible flow. Hence, a
fully three-dimensional method was developed which made use of
the Full Potential Equation (F.P.E.) in conservative form. A
computational mesh is placed around the body configuration and
at each mesh node the F.P.E. is satisfied ~n finite difference
form. The method is able to give a complete description of the
flow around the bodies at transonic mach numbers. Comparisons
to test the accuracy and efficiency of the method are limited
to either, purely subsonic flow for two body configurations or
zero incidence for transonic flow around a single body.