Dynamic viscosity

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The SI unit of dynamic viscosity (Greek symbol: $\mu$ ) is the pascal-second ( $Pa\cdot s$ ), which is identical to $1 \frac{kg}{m\cdot s}$ .

The dynamic viscosity is related to the kinematic viscosity by

$\mu=\rho\cdot\nu$

where $\rho$ is the density and $\nu$ is the kinematic viscosity.

For the use in CFD, dynamic viscosity can be defined by different ways:

as a constant
as a function of temperature (e.g. piecewise-linear, piecewise-polynomial, polynomial, by Sutherland's law or by the Power law)
by using Kinetic Theory
composition-dependent
by non-Newtonian models

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