Effect of viscoelasiticity on the far-dissipation range of homogeneous isotropic turbulence

The comparison of the results of direct numerical simulations of isotropic turbulence of Newtonian and viscoelastic fluid, based on the FENE-P model, provide evidence that viscoelasticity modifies qualitatively the behavior of the smallest scales: we observe a k⁻⁶ law in the far dissipation range of the energy spectrum and we show...

Is isotropy restored at small scales in freely decaying strongly stratified turbulence?

We analyse the scale-dependent anisotropy of homogeneous stratified turbulence. The Ozmidov scale l_N (Ozmidov 1965) helps to compare the relative effects of inertia and of the buoyancy force, and thus to quantify the rise of anisotropy in different scale ranges: at large scales l >> l_N the anisotropy due to strong stratification is dominant,...