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It is essential for the accurate time-domain prediction of broadband noise due to turbulence-cascade interaction to develop inflow/outflow boundary conditions to satisfy the following three requirements: to maintain the back ground mean flow, to nonreflect the outgoing disturbances and to generate the specified input gust. The preceding study (1) showed that perfectly matched layer(PML) boundary con-dition was successfully applied to absorb the outgoing disturbances and to generate the specified gust in the time-domain computations of broadband noise due to interaction of incident gust with a cas-cade of flat-plates. In present study, PML boundary condition is extended in order to predict steady mean flow that is needed for the computation of noise due to interaction of incident gust with a cas-cade of airfoils. PML boundary condition is originally designed to absorb flow disturbances super-imposed on the steady meanflow in the buffer zone. However, the steady meanflow must be com-puted before PML boundary condition is applied on the flow computation. In the present paper, PML equations are extended by introducing source term to maintain desired mean flow conditions. The ex-tended boundary condition is applied to the benchmark problem where the meanflow around a cas-cade of airfoils is predicted. These illustrative computations reveal that the extended PML equations can effectively provide and maintain the target meanflow.

han-guk soeum jindong gonghakoe nonmunjip/han'gug soeum jindong gonghaghoe nonmunjib

Development of Internal Inflow/outflow Steady Mean Flow Boundary Condition Using Perfectly Matched Layer for the Prediction of Turbulence-cascade Interaction Noise