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Fuel System Library 4.0

Nguyen Anh November 14, 2016

Fuel System Library 4.0

Enhanced fluid options, new fuel tanks with visualization, more examples

Modelon’s Fuel System Library 4.0 contains new features that enable higher fidelity models and improvements for better user experience.

New features

  • More fluid options

Fuel System Library 4.0 includes many new fuel-air fluids. Jet fuels JP-4, JP-5, and JP-8 were added based on data from the Handbook of Aviation Fuel Properties by Coordinating Research Council, Inc.

The FluidProperties package has been reworked for a better user experience with expanded documentation for the contents and instructions for the creation of  custom fluid properties.

  • More detailed fluids

Simulations for fuel inerting and flammability are useful for conducting important analyses in the design of aircraft fuel systems.  These types of simulations require more detailed fluid models so Fuel System Library 4.0 has seen an upgrade to the FluidProperties package.

There is now the option to use nitrogen and oxygen as components of the gas at a non-fixed ratio instead of a lumped dry air component. With this option, the concentrations of nitrogen and oxygen can be tracked separately. A fuel tank inerting example was added to demonstrate the use of the fluid to assess whether the use of a nitrogen-enriched air source will inert the ullage of fuel tanks.

Another set of fluids was made to consider the evaporation of fuel. This enhancement allows tracking the concentration of fuel in the gas state for flammability analyses. In addition, these fluids include the solubility of gases in fuel. The solubility is based on the temperature, gas component and type of jet fuel. Trace concentrations of the dissolved gas are important to consider in fuel systems when gas evolves at colder temperatures during climb.

Fuel System Library 4.0
Figure 1 Fuel tank inerting system with evaporating fuel properties simulated with Fuel System Library 4.0 in Dymola
Fuel System Library 4.0
Figure 2 Fuel tank inerting. Gas composition in the ullage.
Fuel System Library 4.0
Figure 3 Fuel tank inerting. Aggregate mass of fuel in the system over time.

  • New fuel tanks

A new tank mode lallows  the user to load tessellated geometries from CAD packages via STL files.

In Dymola an animation is generated to visualize the shape of the tank and the free surface of the liquid.


The simple box shaped and complex fuel tanks can include convective heat transfer. It is possible to define separate “sides” of the tank and corresponding heat transfer coefficients for the wet and dry surface areas of each side.

These new tank models deliver capabilities normally limited to complex and time-consuming CFD computations at the speed and convenience of system simulations.


  • Restructured library for easy navigation.
  • More examples with additional documentation to showcase the new features.
  • Automatic aggregation of the mass from components in the system to track the total mass of fuel in the system and to simplify the analysis of simulation results.

Interested in the new functionalities in Fuel System Library? Contact us to learn more.

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