Response of a turbulent von Karman swirling flow to anisotropy at the molecular scale

We ask if and how the large-scale structure of a turbulent von Karman swirling flow depends on anisotropies introduced at the smallest scales. We generate such anisotropy at the viscous scale in a paramagnetic colloid whose rheology is modified by an external, uniform magnetic field. We report measurements in a high Reynolds number turbulence experiment ($R_{\lambda}$ = 120). Ultrasound velocimetry provides records of tracer particle velocity. Distinct changes in the velocity statistics can be observed extending from the dissipative scales up to the mean flow topology.