### 35.2.1. Simulation Data

A short description of each of the Problem Type options is displayed in CFX-Pre.

#### 35.2.1.1. Problem Type

Problem Type can be set to any of the following:

- `Single Phase`

  Only one fluid is present in a single phase simulation, and it is usually a pure substance.

- `Multi-Component`

  If this option is selected, the simulation is used to model the average properties of a mixture of chemical species.

- `Multi-Phase`

  This option contains more than one fluid, each of which is modeled separately. In general, unlike multi-component simulations, the fluids are of different chemical species.

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