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The high-Reynolds-number wake of a slender body with a turbulent boundarylayer is investigated using a hybrid simulation. The wake generator is a 6:1prolate spheroid and the Reynolds number based on the diameter $D$ is $Re =10^5$. The transition of the unstratified wake to a state of completeself-similarity is investigated by looking for the first time into the farfield of a slender body wake. Unlike bluff-body wakes, here the flow is notdominated by vortex shedding in the near wake. Instead, the recirculationregion is very small, the near wake is quasi-parallel and is characterized bythe presence of broadband turbulence. The simulations show that theseparticularities alter the decay rate of the wake significantly and challengethe notion of universality -- the idea that far from the body all turbulentwakes decay at the same rate. The influence of stratification in the wake isalso studied at Froude numbers $Fr=U_\infty/ND=2$ and $10$. The results implythat the onset of buoyancy effects depends on the wake generator and that thefar wake retains information of the initial conditions.

The high-Re far wake of a slender body and the effects of density stratification