LES of a turbulent channel flow with a predictive wall model

Large-eddy simulations (LES) of turbulent channel flow are presented. These LES combine the stretched-vortex, subgrid-scale (SGS) model with a near-wall model (Chung \& Pullin {\it JFM} 2009) that here provides a plane-averaged, wall-shear stress together with a plane-averaged slip velocity at a raised or ``virtual'' wall. Instantaneous stream-wise fluctuations are then added to this slip velocity using an empirical inner-outer wall model (Mathis {\it et al}, {\it JFM} 2011) driven by a velocity time-series obtained from within the log-layer of the outer flow. This spatially fluctuating slip velocity is used as a boundary condition for the outer LES. Results using several variations of this wall model are described for turbulent channel flow at Reynolds numbers $Re_\tau$ up to $2.2 \times 10^4$.