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Section 4.14: Viscous Fluids Up Section 4.14: Viscous Fluids Subsection 4.14.2: Viscous Fluid Materials

### 4.14.1 General Specification of Fluid Materials

The material type for a fluid material is “fluid”. The following parameters must be defined:
 Fluid referential density [M/L] Bulk modulus [P] Specification of viscous model for
The <viscous> tag encloses a description of the viscous stress constitutive relation and associated material properties, as may be selected from the list provided in Section 4.14.2↓. The parameters <density> and <k> must be greater than 0. These parameters are always required.
Example:
<material id="1" name="Water" type="fluid">
<density>1</density>
<k>2.2e+09</k>
<viscous type="Newtonian fluid">
<mu>0.001</mu>
<kappa>0</kappa>
</viscous>
</material>



Section 4.14: Viscous Fluids Up Section 4.14: Viscous Fluids Subsection 4.14.2: Viscous Fluid Materials