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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


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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