Numerical simulation of flow around two side-by-side elliptic cylinders at different Reynolds numbers

Abstract

The study of the flow around the parallel elliptic cylinder is important to the analysis of the shedding vortex, lift, and drag characteristics in practical engineering, while relevant research is limited. In this paper, the flow around two side-by-side elliptic cylinders at different Reynolds numbers (Re=100,3900,105) is numerically simulated, and the flow characteristics at different gap-ratios and aspect-ratios are analyzed. By comparing the shedding characteristics of the vortexes and the lift (C_(L,AMP) and C _L)and drag (C _D) characteristics of the structure, we found that the vortex appears as a single elliptic cylinder at different Reynolds numbers and when G is small. Then, with the increase of gap-ratio G, vortexes gradually occur at the gap. Furthermore, C _D, C_(L,AMP)and C _L show a decreasing trend. With the increase of aspect-ratio A, the size of the vortices in the upper and lower branches decreases at different Reynolds numbers, while the vortexes in the middle branch show different characteristics at different Reynolds numbers.C _Ddecreases at different Reynolds numbers as A increases. At Re=100, with the increase of A, C_(L,AMP) decreases, while C _L increases. At Re=3900 and Re=105, The curves of C_(L,AMP) and C _Lshow fluctuations.