Wakes of inclined prolate spheroid in the stratified environment - body forces and vortex dynamics*

Despite their widespread presence in underwater applications, stratified wakes of slender bodies placed at an angle of incidence have received significantly less attention compared to their unstratified counterpart. To this end, we perform large eddy simulations (LES) 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 $5\times10^{3}$ 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 the body does not have any visible asymmetry. We will discuss the effect of this asymmetry (and its absence in strongly stratified cases) on the streamwise vortex pair shed from the body and, thereby, on mean and turbulent fields.