Pω增强型k-ω湍流模型在三角翼旋涡流动的应用.

The production of k-ω within standard Wilcox k-ω turbulence model is dependent on the mean strain-rate of the flow and does not take the rotation rate into account, resulting in the prediction of a weak vortex which can’t be sustained and diffuses quickly. A suitable sensor is defined to distinguish between shear layers and vortex cores, to increase the production of the dissipation rate (ω)within regions of highly rotational flow. k-ω with Pω enhancer turbulence model is applied to RANS solver for structured grid. Subsonic and transonic flows around a 65 o swept leading edge delta wing are simulated numerically. The computational results are compared with detailed experimental data obtained from a series of wind tunnel tests in the NTF at NASA and DNW-TWG at DLR. The comparisons show that the k-ω with Pω enhancer turbulence model produces better results when it comes to capturing the vortex core, the critical angle of attack and the position of vortex breakdown at subsonic and transonic flows, thus is suitable for simulating the vortical flow around delta wing. [ABSTRACT FROM AUTHOR]