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Subsection 4.14.2: Viscous Fluid Materials Up Subsection 4.14.2: Viscous Fluid Materials Subsubsection 4.14.2.2: Carreau Model

#### 4.14.2.1 Newtonian Fluid

The material type for a Newtonian fluid is “Newtonian fluid”. The following material parameters must be defined:
 shear viscosity [Pt] bulk viscosity [Pt]
The viscous shear stress for this material model is Stokes' condition is a constitutive assumption that sets , implying that . This assumption is only valid for some fluids (e.g., monoatomic gas [45]). Users may use or ignore this assumption by selecting an appropriate value for .
Example:
<viscous type="Newtonian fluid">
<mu>0.001</mu>
<kappa>0</kappa>
</viscous>

Subsection 4.14.2: Viscous Fluid Materials Up Subsection 4.14.2: Viscous Fluid Materials Subsubsection 4.14.2.2: Carreau Model