Development and validation of a turbulence model based on drift velocity

Abstract

This paper proposes a novel turbulence model based on drift velocity. By employing a partial-averaging method, the model decomposes turbulent fluctuations into two symmetric groups and derived transport equations for the drift velocity, successfully preserving the first-order statistical information of turbulence. The drift velocity model addresses the limitations of traditional Reynolds-Averaged Navier–Stokes models in near-wall turbulence simulations by reconstructing the drift velocity momentum equation and incorporating a wall destruction term for accurate resolution. Implemented on the OpenFOAM platform, the model's performance is evaluated against several standard benchmarks, including the flat plate boundary layer, 0012 airfoil bypass, and backward-facing step flow. Results demonstrate improved accuracy of the drift velocity model in simulating complex turbulent flows.