動的失速の数値解析

抄録

Computer codes to compute dynamic stall are developed, then two-and three-dimensional dynamic stall is numerically investigated and compared with experimental results. Both PDNS (Pseudo Direct Numerical Simulation) and RANS (Reynolds Averaged Na vier-Stokes) analysis are used to compute turbulent separated flows. In order to find most appropriate RANS turbulence model, several models are tested at first for static problem and SA (Spalart-Allmaras) model shows best agreement with experiment. Then RANS and PDNS are applied to two-dimensional deep dynamic stall case, in which k=0.1 and angle range 0-20 degree, and both computations show qualitative agreements with experimental results, however, quantitative agreements are not satisfactory. In three-dimensional static case, in which k =0.08 and angle range 12-24 degree, RANS computation with SA model shows good agreement. For dynamic stall, quantitative agreements of both model are not satisfactory, however, RANS computation exhibits better results. Thus, it is expected that RANS will give good estimation for more moderate parameters, because agreement in static case is good and the dynamic case is another extreme in practical case.