Modeling near-wall effects in axially rotating pipe flow by elliptic relaxation

The ability to faithfully reproduce the effect of axial rotation on fully d eveloped turbulent pipe how is investigated using a low-Reynolds-number, se cond-moment closure model. In particular, the impact of the pressure-strain model is scrutinized by adopting both linear and nonlinear models. Near-wa ll effects are modeled by elliptic relaxation, and model predictions are ve rified against direct numerical simulations as well as experimental results , The results suggest that pressure-strain models cubic in the Reynolds str esses seem unsuitable for this particular case, whereas the best overall pe rformance is obtained by a model that retains terms quadratic in the Reynol ds stress tensor. However, the stabilizing effect of the imposed axial rota tion on the turbulence is in general overpredicted by the models.