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We study the physics of turbulent/non-turbulent interface of an isolatedturbulent region in dilute polymer solutions and Newtonian fluid. Theperformance of a FENE-P model with a localized homogeneous forcing is verifiedusing the specially designed experimental setup of a turbulent patch growing inwater/dilute polymer solution, without mean shear and far from the walls. Theresults of the small scale dynamics of vorticity and strain help to reveal thekey mechanism of polymer action in turbulent flows without mean shear. Modifieddegrees of alignment between vorticity, the polymer conformation and therate-of-strain tensors found especially near the interface explain the reducedvorticity stretching and increased vorticity compression terms. These smallscale alignments in the non-Newtonian turbulent flow thus lead to a reducedproduction of enstrophy and consequently to a reduced entrainment (seen aspropagation or dispersion).

Small scale dynamics of a shearless turbulent/non-turbulent interface in dilute polymer solutions