Nonequilibrium dissipation scaling in large Reynolds number turbulence generated by rectangular fractal grids

We present experimental observations of the turbulence field generated by a rectangular fractal grid. For engineering tests in wind tunnels, the grid can be used to produce turbulent flows with high turbulence intensities and large integral length scales. Our results also add to previous knowledge of nonequilibrium dissipation scaling, which is observed in decaying turbulence, even though homogeneity and isotropy are not strictly satisfied.