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Reynolds Equation and Mixing Length Model Phenomenological Theories of Turbulence The classical phenomenological theories of turbulence are referred to as the first-order closures (closure at the order of the first moment) or zero-equation models (no additional differential equation are introduced to solve). Boussineq Eddy Viscosity Model Boussineq suggested
where
is the eddy viscosity. For plane shear flow,
It is now well recognized that |
is
not a constant and is strong function of state of turbulent motion.
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