抄録
In this study, a Computational Aeroacoustics (CAA) solver, UPACS-LEE, is developed as an extension of UPACS, a multi-block CFD solver developed in ISTA/JAXA that can run on parallel computers. Using UPACS-LEE code, acoustic propagation from non-compact sound source can be calculated, including non-uniform mean flow effect and reflection at the wall. Also, high order scheme is implemented in order to resolve the waves with a small number of grid cells. Various benchmark problems are solved, and the results are compared with the analytical solutions in order to validate the reliability of the code. At the end of this paper, acoustic scattering around high lift devices of an aircraft is shown. The effect of the mean flow is investigated by comparing the result with that of the no-flow case. Including the effect of the mean flow results in the Doppler effect, and it also significantly influences the directivity of the sound.
