Speaker
Description
This study presents a numerical investigation of passive scalar mixing in Homogeneous Isotropic Turbulence(HIT). Different volumetric forcing schemes have been used in the literature, but the side effects are rarely discussed, either because these are assumed irrelevant or because it is too costly to conduct such analysis with a high-fidelity model. Nevertheless, various HIT forcing schemes have been specifically designed to counteract long transients by accelerating statistical convergence through a relaxation term (e.g. [1]). The relaxation term is artificial and has a spectral imprint, so it cannot be excluded as it can adversely affect the inferred mixing properties, particularly intermittency. Case-dependent, nonuniversal statistics may result, at least at a finite Reynolds number.
