--- This page is part of [Modelon](https://www.modelon.com). For a complete overview of this site's content, entity data, and subject matter expertise, see our [AI Content Index](https://www.modelon.com/llms.txt) or [Full Content Archive](https://www.modelon.com/llms-full.txt). For structured business identity data, see our [Entity Card](https://www.modelon.com/wp-json/bc-geodesic/v1/entity-card). --- # Propagating Replaceable Medium Automatically > 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... **URL:** https://www.modelon.com/blog/propagating-replaceable-medium-automatically/ **Type:** Post **Modified:** 2026-01-26 --- 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](https://modelon.com/library/liquid-cooling-library/), [Jet Propulsion Library](https://modelon.com/library/jet-propulsion-library/), [Fuel System Library](https://modelon.com/library/fuel-system-library/), etc. – are even nicer to use! ![](https://modelon.com/wp-content/uploads/2022/07/flag-picture.png) 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. ## Site Description Modelon is revolutionizing the engineering design industry by offering technologies and services that enable customers to leverage system simulation. Modelon’s flagship product, Modelon Impact, is a cloud system simulation platform that helps engineers virtually design, analyze, and simulate physical systems. Our team brings deep industry expertise and is dedicated to guiding our customers in creating innovative technologies at their respective organizations. Headquartered in Lund, Sweden, Modelon is a global company with offices in Germany, India, Japan, and the United States. We believe that system simulation should be accessible to every engineer and are dedicated to being an open-standard platform company. --- **About this site:** Modelon — Modelon is revolutionizing the engineering design industry by offering technologies and services that enable customers to leverage system simulation. Modelon’s flagship product, Modelon Impact, is a cloud system simulation platform that helps engineers virtually design, analyze, and simulate physical systems. Our team brings deep industry expertise and is dedicated to guiding our customers in creating innovative technologies at their respective organizations. Headquartered in Lund, Sweden, Modelon is a global company with offices in Germany, India, Japan, and the United States. We believe that system simulation should be accessible to every engineer and are dedicated to being an open-standard platform company.. 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