Macroviscosity

From Glossary of Meteorology



macroviscosity

A quantity with the dimensions of kinematic viscosity, defined as u*z0, where u* is the friction velocity and z0 the aerodynamic roughness length.

In smooth flow the macroviscosity is of the order of one-tenth the kinematic viscosity. In normal atmospheric flow, which is fully rough, it is of the order of 10-2 m2s-1, or about 1000 times the kinematic viscosity.
See logarithmic velocity profile.


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