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Many Dymola users who integrate Modelon libraries may currently struggle with selecting the medium in each component. This is forcing users to either do it manually on each component or propagate the medium at a top level for each of them. This manual update is a tedious process, error-prone and not conducive to working efficiently or effectively.

With the release of Dymola 2019 FD01, a new flag has been added: Advanced.MediaPropagation. This flag can be set to:

  • 0 – Dymola will behave as described previously
  • 1 –  The media will be automatically propagated at a top-level with pop-up windows informing the modeler of viable component combination options
  • 2 – The media will be automatically propagated at a top-level with fewer pop-up windows

With this feature activated, Dymola detects when two components including a medium are connected and automatically offer the modeler to propagate the medium at a top level. When connecting an additional component to these models, the propagation will be suggested (if Advanced.MediaPropagation = 1) or performed (if Advanced.MediaPropagation = 2).

The MediaPropagation flag is a great improvement that simplifies the workflow of modelers using medium packages in their model. Set Advanced.MediaPropagation=1 or 2 and enjoy a smooth usage of our libraries in Dymola!

Now, the advantages of the medium package are combined with effective user experience and therefore, many Modelon libraries– such as Liquid Cooling Library, Jet Propulsion Library, Fuel System Library, etc. – are even nicer to use!

If you like this flag you can turn it on automatically while opening Dymola by adding it to the setup.dymx file in your local AppData\Roaming\DassaultSystemes\Dymola\ folder. Once opened, add the following line in the type of flag.

Note: the propagation is not final and could be “broken” if in a component the user overwrites the propagation modifier.

Clément Coïc

Clément Coïc is a Senior Simulation Engineer at Modelon. Clément’s previous experience includes Modelica-based library architecture and development at Dassault Systemes and model-based design of hydraulic components and systems at Airbus Helicopters. Clément holds two MSc (in France and Spain) in System Engineering and Mechanical Engineering, and a PhD on model-based hydraulic actuation system design for helicopters (INSA Toulouse & Airbus Helicopters).

jonas malmqvist

Jonas Malmqvist is currently an Application Engineer at Modelon. Previously Jonas was responsible for system simulation at Minesto. He holds and MSC in Mechanical Engineering from Chalmers University.