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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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