Flow past an inclined spheroid in homogeneous and stratified environments

Abstract

Large-eddy simulations (LES) are performed to study the flow past a 6:1 prolate spheroid placed at an angle of incidence of $\alpha =10^{\circ }$. The diameter-based Reynolds number ($Re=U_{\infty }D/\nu$) is set to a value of $5\times 10^3$ and four values of diameter-based Froude numbers ($Fr=U_{\infty }/ND$) are analyzed: $Fr=\infty ,6,1.9,$ and $1$. Visualizations of coefficient of pressure ($C_p$) and friction ($C_f$) contours reveal asymmetry in the $Fr=\infty$ and $6$ flows while, at $Fr=1$ and $Fr=1.9$, the flow over body does not have any visible asymmetry. This finding is further corroborated through the analysis of force coefficients on the body. The changes in the pressure coefficients ($C_p$), friction coefficients ($C_f$), and drag coefficients ($C_d$) with the Froude number are described in detail for $\alpha =10^{\circ }$. We also present the analyses of forces on the body at $\alpha =0^{\circ }$ angle of incidence for comparison with the $\alpha =10^{\circ }$ cases.

4 figures, 1 table, presented at TSFP 12