MULTIGRID CALCULATION OF 3-DIMENSIONAL VISCOUS CASCADE FLOWS

A three-dimensional code for viscous cascade flow prediction has been developed. The space discretization uses a cell-centered scheme with e igenvalue scaling to weigh the artificial dissipation terms. Computati onal efficiency of a four-stage Runge-Kutta scheme is enhanced hy usin g variable coefficients, implicit residual smoothing, and a full-multi grid method. The Baldwin-Lomax eddy-viscosity model is used for turbul ence closure. A zonal, nonperiodic grid is used to minimize mesh disto rtion in and downstream of the throat region. Applications are present ed for an annular vane with and without end wall contouring, and for a large-scale linear cascade. The calculation is validated by comparing with experiments and by studying grid dependency.