Initialization of decaying turbulence to study turbulent/non-turbulent interfaces

We present a new method for initializing decaying homogeneous, isotropic turbulence to bypass transients produced in a number of other approaches. We propose to re-scale the turbulence in Fourier space after a number of eddy turnover times to achieve a desired spectrum and intensity. We demonstrate the viability of this approach using the canonical problem of the decay of homogeneous, isotropic turbulence, and further use this approach to study mixing at interfaces separating fields of different intensities.