Time-dependent difference theory for noise propagation in a two-dimensional duct

1980 18th Aerospace Sciences Meeting   unpublished
A time-dependent numerical formulation is derived for sound propagation in a two-dimensional straight soft-walled duct in the absence of mean . flow. The time-dependent governing acoustic-difference equations and boundary conditions are developed along with the maximum stable time inrement. Example calculations are presented for sound
doi:10.2514/6.1980-98 fatcat:bnfq5yyma5brnam2gyl2heo5qa