Confinement effects on the behaviour of zero-mean forced turbulence with slip and no-slip walls

The objective of this work is to quantify the influence of wall reflections and near-wall viscous effects on the evolution of Reynolds stresses in wall-bounded turbulent flows. To study these effects, we consider a canonical setup of volumetrically forced turbulence with walls encompassing a wide range of turbulence anisotropies. We enforce that the generated turbulence has zero-mean and establish convergence of statistics with respect to the domain lateral length. The confinement effect of the walls modifies the decay rate of Reynolds stress and its anisotropy. In this setting, we specifically focus on understanding the behaviour of terms associated with the decay of Reynolds stresses in the presence of walls, namely, dissipation and pressure-strain terms. We consider both slip and no-slip walls, and report their corresponding effects on the near wall zones as a function of Reynolds number and prescribed anisotropy through the forcing.