## Fluid Section Types: Liquids

A network element is characterized by a type of fluid section. It has to be specified on the *FLUID SECTION card unless the analysis is a pure thermomechanical calculation.

Typical material properties needed for a liquid network are the density (temperature dependent, cf. the *DENSITY card), the heat capacity and the dynamic viscosity (both temperature dependent and to be specified with the FLUID CONSTANTS card).

A special case is the purely thermal liquid network. This applies if:

• no TYPE is specified on any *FLUID SECTION card or
• the parameter THERMAL NETWORK is used on the *STEP card or
• all mass flow is given and either all pressures or given or none.
In that case only is needed.

For liquids the orifice (only for ), restrictor, branch, and vortex fluid section types of gases can be used by specifying the parameter LIQUID on the *FLUID SECTION card. In addition, the following types are available as well (the coefficients for the head losses are taken from [10], unless specified otherwise):

Subsections