# Dynamic viscosity

(Difference between revisions)
 Revision as of 10:56, 4 October 2006 (view source)← Older edit Revision as of 11:02, 4 October 2006 (view source)Newer edit → Line 1: Line 1: - The SI physical 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 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 The dynamic viscosity is related to the kinematic viscosity by Line 5: Line 5: $\mu=\rho\cdot\nu$ $\mu=\rho\cdot\nu$ + 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 {{stub}} {{stub}} [[Category:Turbulence models]] [[Category:Turbulence models]]

## Revision as of 11:02, 4 October 2006

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