Abstract
Unphysical numerical oscillations (UNOs) arise when a non-dissipative scheme is employed to discretize fluid equations on a coarse grid. Treating UNOs often relies on upwind schemes, digital filtration, artificial viscosity, or adaptive mesh refinement, which are either too dissipative or too costly. We propose an alternative solution by refining one grid in regions where the flow velocity changes drastically. The effectiveness of our single-point grid refinement strategy is tested in various two-dimensional and three-dimensional flows at both laminar and turbulent flow conditions, and the results are highly favorable.
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