Specifying the Working Fluid

Specifying Fluid Properties

You can set the working fluid in your network by connecting a fluid properties block to any point in the network. If you do not attach a fluid properties block, the domain defaults apply. For the default properties of the different domains, see:

Selecting a Fluid Settings Block

To set the fluid properties in an Isothermal Liquid network, you can:

To set the fluid properties in a Hydraulic (Isothermal Liquid) network, you can:

  • Specify your own properties by connecting a Custom Hydraulic Fluid block from the Simscape Foundation library.

  • Connect and select one of the predefined liquids in the Hydraulic Fluid block from the Simscape Fluids Hydraulic (Isothermal Liquid) library.

To set the fluid properties in a Thermal Liquid network, you can:

  • Specify your own properties by connecting a Thermal Liquid Settings (TL) block at any point in the network. This block is in the Simscape Foundation library.

  • Connect and select one of the predefined liquids in the Thermal Liquid Properties (TL) block from the Simscape Fluids Thermal Liquid library.

To set the fluid properties in a Gas network, you can specify your own properties by connecting a Gas Properties (G) block from the Simscape Foundation library. You can choose to model a perfect, semi-perfect or real gas.

To set the properties in a Two-Phase Fluid network, you can specify your own properties by connecting a Two-Phase Fluid Properties (2P) block from the Simscape Foundation library. You can provide tabulated data for liquid and vapor properties and specify the network behavior near the fluid critical pressure.

To set the properties in a Moist Air network, you can specify your own properties by connecting a Moist Air Properties (MA) block from the Simscape Foundation library. You can provide tabulated data for dry air and water vapor and specify the fluid temperature and pressure ranges.

Working with Multiple Fluid Networks

Simscape Fluids models can have multiple fluid networks, each representing a single-fluid system. To avoid model compilation errors, use only one fluid settings block per network. Two fluid networks are treated as distinct if they belong to different Simscape domains or if they share no direct connection line.