  The paper presents a Projection-Based Reduced-Order Model for simulations of
high Reynolds turbulent flows. The PBROM are enhanced by incorporating various
models of turbulent viscosity and residual closures to model the effects of
interactions among the modes and energy dissipations. Remarkable improvements
in prediction accuracies are achieved with a suitable turbulent viscosity model
and a residual closure. The enhanced PBROM models are demonstrated for high-Re
flows past a cylinder in two- and three- dimensions. These enhancements have
shown capable of capturing complex flow features and removing unnecessary ones,
while not affecting the efficiency of the overall model.
