Universality of large eddy simulation model parameters across a turbulent wake behind a heated cylinder

The issue of universality in the specific context of subgrid scale (SGS) physics and modelling for large-eddy simulation (LES) is addressed in this study from two perspectives, i.e. global averages and conditional averages. The specific objectives of the present a priori study are to examine how uniform (i.e. universal) are model parameters across a generic shear flow, both in terms of the mean flow and in terms of the coherent structures. Other related objectives are to document possible differences between momentum and scalar SGS dissipations, and to compare eddy-diffusion and nonlinear model predictions. Measurements are performed across a high Reynolds number heated wake flow, using an array of four X-wire and four cold-wire probes. This array enables us to obtain two-dimensional filtered quantities in the cross-stream and streamwise directions by invoking Taylor's hypothesis with three different filter scales. The results show that there are significant differences between the general trends in globa...