: Astronomie: eddy viscosity

physical parameter > viscosity > eddy viscosity

eddy viscosity

In the study of turbulence in fluids, a common practical strategy is to ignore the small-scale vortices (or eddies) in the motion and to calculate a large-scale motion with an effective viscosity, called the "eddy viscosity", which characterizes the transport and dissipation of energy in the smaller-scale flow. In contrast to the viscosity of the fluid itself, which must be positive by the second law of thermodynamics, the eddy viscosity can be negative. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Viscosity#Eddy_viscosity)

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