APPLICATIONS OF ALGEBRAIC REYNOLDS STRESS TURBULENCE MODELS .2. TRANSONIC SHOCK-SEPARATED AFTERBODY

The ability of the three-dimensional Navier-Stokes method PAB3D code t o simulate the effect of Reynolds number variation using nonlinear exp licit algebraic Reynolds stress turbulence modeling was assessed, Surf ace pressure coefficient distributions and integrated drag predictions on an axisymmetric nozzle afterbody were compared with experimental d ata at Reynolds numbers from 10 to 130 x 10(6). There was generally go od agreement of surface static pressure coefficients between the compu tational fluid dynamics (CFD) and measurement. The change in pressure coefficient distributions with varying Reynolds number was similar to the experimental data trends, though the CFD slightly overpredicted th e effect. The computational sensitivity of viscous modeling and turbul ence modeling are shown, Integrated afterbody pressure drag was typica lly slightly loner than the experimental data, The change in afterbody pressure drag with Reynolds number was small, both experimentally and computationally, even though the shape of the distribution was somewh at modified with the Reynolds number.