### 35.2.2. Working Fluid

Under Working Fluid, you select the fluids for use in the domain.

- Fluid(s)

  If Analysis Type is set to `Single Phase`, you may select only one fluid for the domain. If `Multi-Phase` was chosen, you may select at least two fluids.

- Mixture

  If you are defining a multi-component simulation, you must provide a name for your custom material, which is defined by the fluids specified under Components.

- Components

  Select the fluids you plan to use in the simulation from this drop-down menu. At least two fluids are required.

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