Structure function scaling

Structure function scaling in a Re(λ) = 250 turbulent mixing layer

A. Attili, F. Bisetti, Structure function scaling in a Reλ = 250 turbulent mixing layer, J. Phys.: Conf. Ser. 318 042001, (2011​​​)​
A Attili, F Bisetti
Turbulent mixing, structure functions, turbulent mixing layer
​​A highly resolved Direct Numerical Simulation of a spatially developing turbulent mixing layer is presented. In the fully developed region, the flow achieves a turbulent Reynolds number Re = 250, high enough for a clear separation between large and dissipative scales, so for the presence of an inertial range. Structure functions have been calculated in the self-similar region using velocity time series and Taylor’s frozen turbulence hypothesis. The Extended Self- Similarity (ESS) concept has been employed to evaluate relative scaling exponents. A wide range of scales with scaling exponents and intermittency levels equal to homogeneous isotropic turbulence has been identified. Moreover an additional scaling range exists for larger scales; it is characterized by smaller exponents, similar to the values reported in the literature for flows