Fourth Computational Aeroacoustics (CAA) Workshop on Benchmark Problems

The proceedings of the Fourth Computational Aeroacoustics (CAA) Workshop on Benchmark Problems cosponsored by the Ohio Aerospace Institute, AeroAcoustics Research Consortium, and the NASA Glenn Research Center are the subject of this report. As in previous workshops, the problems in this workshop were devised to gauge the technological advancement of computational techniques relevant to CAA. These proceedings show the technical progress achieved from the basic challenges to accurate CAA calculations to the solution of CAA problems of increasing complexity and difficulty. Problems were solved in five categories. In three of the five categories, exact solutions were available for comparison to CAA results. A fourth category representing the sound generation by interacting with a gust, a problem relevant to fan noise, had approximate analytical or completely numerical solutions. The fifth category problems had sound generation in a viscous flow. In this case, the CAA results were compared to experimental data.