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Dynamic viscosity

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The SI unit of dynamic viscosity (Greek symbol: <math>\mu</math>) is the pascal-second (<math>Pa\cdot s</math>), which is identical to  <math>1 \frac{kg}{m\cdot s}</math>.
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The SI unit of dynamic viscosity (Greek symbol: <math>\mu</math>) is pascal-second (<math>Pa\cdot s</math>), which is identical to  <math>\frac{kg}{m\cdot s}</math>.
The dynamic viscosity is related to the kinematic viscosity by
The dynamic viscosity is related to the kinematic viscosity by
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<center>
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:<math>\mu=\rho\cdot\nu</math>
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<math>\mu=\rho\cdot\nu</math>
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where <math>\rho</math> is the density and <math>\nu</math> is the [[kinematic viscosity]].
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</center>
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where <math>\rho</math> is the [[density]] and <math>\nu</math> is the [[kinematic viscosity]].
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For the use in CFD, dynamic viscosity can be defined by different ways:
For the use in CFD, dynamic viscosity can be defined by different ways:
* as a constant
* as a constant
* as a function of temperature (e.g. piecewise-linear, piecewise-polynomial, polynomial, by [[Sutherland's law]] or by the [[Power-law viscosity law|Power law]])
* as a function of temperature (e.g. piecewise-linear, piecewise-polynomial, polynomial, by [[Sutherland's law]] or by the [[Power-law viscosity law|Power law]])
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* by using [[Kinetic Theory]]
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* by using Kinetic Theory
* composition-dependent
* composition-dependent
* by non-Newtonian models
* by non-Newtonian models
{{stub}}
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[[Category:Turbulence models]]
 

Latest revision as of 10:03, 12 June 2007

The SI unit of dynamic viscosity (Greek symbol: \mu) is pascal-second (Pa\cdot s), which is identical to \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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