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The instructions on this page will guide you in modifying a simulation to use the Phoenix Simulator's Adaptive Grid feature. Using an adaptive grid allows the simulation grid to expand according to a specified channel as needed. This can be useful for simulations that drastically change in volume such as explosions or expanding plumes of smoke. These options are found in the Grid rollout of the simulator.

Several of the fire and smoke Quick Simulation Setups in the Phoenix Shelf have the Adaptive Grid enabled by default.

Start by creating a new project from File → Project Window. 
Click the New button at the top right corner of the window and give it a name.

This is important because Phoenix stores the simulation data in the data directory of the currently selected project. You can manually point to a different project directory from the File → Set Project... dialog.

Create a piece of geometry to use as an emitter. In this example, a default poly sphere is used. 

Rename the geometry to source_geo_01. 

Select the PhoenixFDSim1 node and in the Attribute Editor, open the Grid tab. Scroll down to the Grid Adaptation section and note that the Adaptive Grid is set to Temperature / Liquid. 

In this setup, the Phoenix Simulator will track the Temperature channel and whenever the temperature value of a voxel close to the boundary of the simulator goes past the Threshold parameter value, the size of the grid will increase. 

For a more detailed explanation of the Adaptive Grid parameter, please check the Simulator → Grid documentation.

Note that whenever the boundary in a certain direction is closed, the simulation will behave as if there is a solid wall blocking the motion of the fluid.