## Chapter 37: Library Objects

Model library templates contain CCL physics definitions for complex simulations. Loading a Model Library imports the CCL definition contained in a template file.

Once this is done, a mesh can be imported and the locations of domains, boundaries, and so on can be assigned. Template files are located in `<CFXROOT>/etc/model-templates/` directory (CFX-Pre will open this directory when a new simulation is created in Library mode).

Model libraries are designed to simplify the problem setup of simulations involving complex physics. Once the problem definition is loaded, CFX-Pre enters General mode, allowing changes to any or all parameters.

Selecting Library Template from the New Case dialog box in CFX-Pre enables you to choose one of the following simulation model templates:

- Boiling Water

- Cavitating Water

- Coal Combustion

- Comfort Factors

- Evaporating Drops (see Liquid Evaporation Model in the CFX-Solver Modeling Guide)

- Multigray Radiation

- Oil Combustion (see Liquid Evaporation Model: Oil Evaporation/Combustion in the CFX-Solver Modeling Guide)

- Spray Dryer (see Liquid Evaporation Model: Spray Dryer with Droplets Containing a Solid Substrate in the CFX-Solver Modeling Guide)

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