Abstract:

For 3-D sound propagation calculations, if computation time were not an issue, it would be straightforward to extend 2-D parabolic equation (PE) models to three dimensions. However, for any 3-D propagation model, computation time is a crucial factor on any personal computer presently available. Hence, in this paper, some computational approaches are discussed that allow one to treat realistic 3-D turbulence in an approximate but physically reasonable way. The computational methods preserve the 3-D statistical properties of the turbulence without generating an unacceptable computational burden. The proposed approaches are outlined and numerical examples are given for sound propagation through meteorologically realistic turbulence fields. [Work supported by DARPA and the Pennsylvania State University Applied Research Laboratory.]