Comparison of Solution of Various Euler Solvers and One Navier-Stokes Solver forthe Flow about a Sharp-Edged Cropped Delta Wing (August 1990)

摘要

For the flow about a sharp-edged cropped 65 deg delta wing numerical solutionsobtained with different Euler methods are compared with each other, with the numerical solution of a Reynolds-averaged Navier-Stokes method and with experimental data in the report. At the selected free-stream Mach number of 0.85 and angle of attack of 10 deg the flow features a leading-edge vortex, is transonic but contains weak shocks only. The results of the Euler methods have been obtained on one and the same C-H type of grid with close to 300,000 cells. The investigation, carried out within the frame work of a four nation collaborative program, indicates that for the test case considered there are, from a theoretical point of view, significant differences between results from different Euler methods, even if artificial dissipation is minimized. However, the correlation of the Euler solutions with experimental data shows much larger differences due to the failure to represent secondary separation in the Euler methods and is therefore unsatisfactory. The results of the Reynolds-averaged Navier-Stokes method demonstrate an improved correlation of theory and experiment.