Fluctuation-Dissipation Relations and statistical temperatures in a   turbulent von K\'arm\'an flow
  We experimentally characterize the fluctuations of the non-homogeneous non-isotropic turbulence in an axisymmetric von K\'arm\'an flow. We show that these fluctuations satisfy relations analogous to classical Fluctuation-Dissipation Relations (FDRs) in statistical mechanics. We use these relations to measure statistical temperatures of turbulence. The values of these temperatures are found to be dependent on the considered observable as already evidenced in other far from equilibrium systems. 
Romain Monchaux and Pierre-Philippe Cortet and Pierre-Henri Chavanis   and Arnaud Chiffaudel and Fran\c{c}ois Daviaud and Pa...