Numerical studies of asymmetric vortex flows around a slender body at high angle of attack

作者：Guo TQ^*; Lu ZL

来源：Modern Physics Letters B, 2005, 19(28-29): 1463-1466.

DOI：10.1142/S0217984905009663

• slender bodies
• high AOA
• asymmetric vortex flows
• Navier-Stokes equations

The asymmetric vortex flows about slender bodies at high angle of attack are investigated numerically. 3D O-O type multi-block structured grids are adopted for the computation, and a series of small spatial disturbances are imposed on the leeward body surface near the tip to trigger the asymmetry. The unsteady Navier-Stokes equations are solved using a dual-time method based on the cell-centered finite-volume scheme. Comparisons between numerical results and experimental data demonstrate that the asymmetric vortex pattern observed in the experiment is successfully simulated. In a certain small perturbation level, the magnitude of the side-force is independent of the size of the spatial perturbation, but its direction is dependent on the direction of the spatial perturbation, i.e. a counterclockwise or clockwise circumferential angle from the leeward meridian. When perturbation is removed, the flow field returns to its original asymmetric shape after a period of oscillation.

• 出版日期2005-12-20
• 单位南京大学