A nonconservative nonlinear flowfield splitting method for 3-D unsteady fluid dynamics

This paper describes a new way to write and solve the governing equations of fluid dynamics that is very well suited to aeroacoustics problems. The flow field variables are split into a mean and a fluctuating part, and then inserted into the governing equations. If the mean flowfield satisfies the steady-state governing equations, then the resulting equations can be written in a very convenient form. These equations are then solved using a method that is second or fourth order accurate in space and time, on a Cartesian grid. Several aeroacoustic benchmark problems are solved, some duct propagation problems are presented, and a long- range scattering problem is solved. The code is written in Fortran-90 using the Message Passing Interface (MPI), and performance results are presented for a cluster of workstations