Eddy viscosity models are mathematical approaches used to simulate turbulent flow by approximating the effects of eddies on momentum transfer within a fluid. These models simplify the complex behavior of turbulence by introducing an effective viscosity, known as eddy viscosity, which represents the enhanced mixing and energy dissipation due to turbulent structures. This concept is crucial for solving the Reynolds-averaged Navier-Stokes equations and understanding turbulence in various environmental contexts.
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