3D POD examination of streamwise enstrophy in a stably stratified sphere wake

Abstract eng:
A three-dimensional proper orthogonal decomposition (POD) is applied to the wake of a sphere in a stably stratified environment. The wake data are obtained through a spectral implicit LES numerical simulation highly resolved in both space and time. The Reynolds number based on the tow velocity and diameter of the sphere is Re = 5 × 103 and the buoyancy Froude number is F r = 4. Due to the nature of the stably stratified wake, the decomposition analysis suggests the possibility of decomposing the flow field into an “inner” portion and an “outer” portion, both representing different flow phenomena. This type of decomposition allows for further examination of the enstrophy variation in the two dominant features of these flows: the turbulent wake core and the internal gravity waves radiated from the wake core.

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