Abstract
In this paper, we are interested in computing the unsteady loading and radiated acoustic pressure field from a flat-plate cascade excited by an incident vortical wave (gust). We solve the two-dimensional nonlinear Euler equations over a linear cascade by a high-order finite difference method. We use Giles's nonreflecting boundary conditions at the inflow and outflow boundaries. The cascade response depends sensitively on the frequency of the convected gust. The unsteady surface pressure distribution and radiated pressure field agree very well with predictions of the linear theory for the tested range of reduced frequency. We also investigate the effects of the incident gust frequency on the undesirable wave reflection at the inflow and outflow boundaries.
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