Updated Fluids Library

If the data in a shared fluid library is changed outside of the model you are opening, the following informational message will appear when opening the file.

Figure 1: Update Fluids dialog window which appears if the fluid properties for the model have changed since it was last opened

There are a few reasons that the fluid data may have been changed:

  1. The model is defined in a previous version of Fathom using a fluid from the AFT Standard fluid library. The AFT Standard fluid library was updated in AFT Fathom 12 in order to standardize the reference for the AFT Standard fluid library using data from the NIST REFPROP Version 10 fluid database. If the model uses the same fluid properties for all scenarios, it is recommended to use the "Change to Base Scenario and update..." option to update the fluid properties throughout the model. If different scenarios use different fluid properties then it is recommended to use the "Update fluid(s) from library in the scenario" option to update each scenario individually.

    Most models will only experience a minor change in results, but some models may experience more significant changes. Contact support for further information on specific fluid changes, and to get a comparison of fluid data between Fathom 11 and Fathom 12.

  2. The model is defined with a custom fluid in the fluid library and the custom fluid was modified outside of this model. If the fluid was changed in error, then choose the option the "Keep using the fluids defined in the scenario" or cancel loading the model and change the fluid. If the changes were intended then update the fluid data used in the model using the "Change to Base Scenario and update..." option.