Category 1: Basic Methods

The fourth Computational Aeroacoustics (CAA) workshop emphasized the application of CAA methods to the solution of realistic problems. Workshop participants presented their solutions to problems in one or more of five categories along with the comparisons of their solutions to the benchmark solutions or experimental data. This report is concerned with Category 1:Basic Methods.The numerical computation of sound is affected by, among other issues, the choice of grid used and by the boundary conditions. The first of three problems involves the issue of aliasing where spatial resolution errors affect the computation of sound. Second, the interface condition problem involves computing the propagation of sound through a surface of discontinuity. The third problem considers the long-term stability and accuracy of boundary treatments.