FluidFlow includes a Gas Regulator component/node which is available from the Controllers tab as shown below:
Gas Regulators can be solved to ISA Equation or Universal Gas equations. The choice can be set when defining your regulator in the database (Database | Gas Regulators) as shown below:
There is some further information at the link below:
The FluidFlow database contains a number of gas mixtures such as natural gas and you can very easily create new mixtures in the fluids database by selecting: 1. Database | Fluids. 2. Select the "NEW MIX" button. 3. Add the various component fluids to ...
Steam is available in the database and is locked in the gas phase so no matter what temperature and pressure you model "steam", it will remain in its gaseous phase. This was a feature request by several users as they often use steam and add it to ...