Simplified Transition and Turbulence Modeling for Oscillatory Pipe Flows

One-dimensional unsteady Reynolds-averaged Navier–Stokes computations were performed for oscillatory transitional and turbulent pipe flows the results validated against existing experimental data a wide variety of Reynolds Womersley numbers. An version Johnson–King model was implemented with optional near-wall modification to account temporal pressure gradient variations, predictions compared those Spalart–Allmaras k–ε turbulence models. Transition relaminarization based on empirical number correlations assumed occur instantaneously: in former case, this assumption valid, but latter deviations between observed. In where numbers are substantially higher than commonly accepted steady critical value (~2000), fully or continuously models produced best correspondence data. Critically conditionally slightly inferior correspondence, no significant benefit observed when effects common one- two-equation employed. The velocity profiles mainly unaffected by oscillations explained noting that viscosity is significantly its laminar counterpart. Thus, proposed analysis categorization flows.