Accession Number : ADA265863


Title :   An Acoustic Scattering Code


Descriptive Note : Final rept.


Corporate Author : ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM


Personal Author(s) : Lopez, Jose ; Goedecke, G H ; Auvermann, Harry J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265863.pdf


Report Date : Apr 1993


Pagination or Media Count : 50


Abstract : Acoustical scattering from atmospheric turbulence is of interest to the Army because it has been identified as a candidate cause of higher than expected sound levels in shadow zones. Shadow zones are those regions where ray theory indicates no sound penetrates. Scattering into these zones may give non- line-of-sight detection through acoustic detection. This report documents the creation of a computer code for acoustic scattering from a collection of turbules or eddies. The picture is a collection of turbules of different sizes with a specified number density in each size increment. In this aspect, the picture is similar to that of optical scattering from atmospheric aerosols where there is a collection of particles of different sizes with a specified size distribution. The optical scattering code AGAUS is the starting point for creation of the Acoustic SCattering from Turbules code, ASCT, which will for acoustic scattering accomplish what AGAUS accomplishes for optical scattering. The similarities and differences between the two types of scattering are pointed out as they influence the computational algorithm.


Descriptors :   *COMPUTER PROGRAMS , *TURBULENCE , *ACOUSTIC SCATTERING , ALGORITHMS , COMPUTATIONS , ARMY RESEARCH , FORTRAN , CROSS SECTIONS , MIE SCATTERING , ELECTROMAGNETIC SCATTERING , BATTLEFIELDS , INTERFACES , REFRACTIVE INDEX


Subject Categories : Computer Programming and Software
      Acoustics
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE