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The high-Reynolds number stratified wake of a slender body is studied using ahigh-resolution hybrid simulation. The wake generator is a 6:1 prolate spheroidwith a tripped boundary layer, the diameter-based body Reynolds number is $Re=U_\infty D/\nu = 10^5$, and the body Froude numbers are$Fr=U_\infty/ND=\{2,10,\infty\}$. The wake defect velocity ($U_d$) decaysfollowing three stages with different wake decay rates \citep{Spedding1997} asfor a bluff body. However, the transition points among stages do not follow theexpected $Nt = Nx/U_\infty$ values. Comparison with the wake of a circular diskin similar conditions \citep{Chongsiripinyo2020} quantifies the influence ofthe wake generator - bluff versus slender - in stratified flow. The stronglystratified $Fr=2$ wake is in a resonant state. The steady lee waves stronglymodulate the mean flow and, relative to the disk, the $Fr=2$ spheroid wakeshows an earlier transition from the non-equilibrium (NEQ) stage to thequasi-two-dimensional (Q2D) stage. The NEQ-Q2D transition is followed by asharp increase in the turbulent kinetic energy and horizontal wake meanders. At$Fr=10$, the start of the NEQ stage is delayed. Transfers between kineticenergy and potential energy reservoirs (both mean and turbulence) are analyzedand the flows are compared in phase space (local Froude and Reynolds number ascoordinates). Overall, the results of this study point to the difficulty offinding a universal framework for stratified wake evolution, independent of thefeatures of the body, and provide insights into how buoyancy effects depend onthe wake generator.

The high-Reynolds-number stratified wake of a slender body and its comparison with a bluff-body wake