Simulation and modeling of turbulence subjected to a period of uniform plane strain

摘要: Direct numerical simulation is used to evaluate the effect of plane strain on isotropic homogeneous turbulence. The subsequent return isotropy after removal also investigated. Large, moderate, and small rates are computed at moderate turbulence Reynolds numbers. initial generated via mechanical mixing so that large scale develops relatively naturally. Turbulence length scales, numbers, decay rates, anisotropy over range simulations, with goal quantifying how anisotropic behaves. simulations indicate may not zero very times. In agreement experimental data, presence a recovery region discerned before process observed. Trajectory crossing observed invariant map indicating itself sufficient determine its time evolution. Model constants for classic return-to-isotropy models determined from data shown vary time. oriented-eddy collision model [M. B. Martell J. Perot, “The model,” Flow, Turbul. Combust. 89(3), 335 (2012)], which includes turbulent structure information, predict salient straining process.