The symmetric vortex flows over a slender body at low and high incidence are numerically simulated using Fan grid, Ladder grid, and Interface grid. The asymmetric vortex flow at high incidence is also investigated. From the comparisons of vortex core location, vortex visualizations, surface pressure, and force along the length, it is confirmed that the separated flow around the slender body is very sensitive to the grid of boundary layer. It is necessary to strictly ensure the grid orthogonality; With the increase of incidence, the flow shows more sensitive to the grid; The ladder grid may arouse Non-physical disturbance in the flow, and the vortex visualizations of interface grid has a discontinuous phenomena; The calculation error for surface pressure, force along the length and separation location using Fan grid is minimum, and that using interface grid is maximum; The force along the length using Fan grid has a compression trend to the head of the slender body, with the float location closer to the head. The second and third extreme values are larger, indicating that the asymmetry flow using Fan grid has a trend of extending to the rear of the slender body.
LIU Yue, GUAN Xiao-rong, XU Cheng, CHANG Ling-ling.
Effect of Different Grid Topology on the Calculation of Flow around a Slender Body[J]. Chinese Quarterly of Mechanics, 2016, 37(2): 318-326 https://doi.org/10.15959/j.cnki.0254-0053.2016.02.013