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Question
During the simulation of OpenLoop model using the OpenLoop plugin, I get the following the error message  when starting the model "Reference Distribution OpenLoop not found. Heat transport loop ignored" - see Fig 1. Why? 

 
Fig 1 - Error message "Reference Distribution OpenLoop not found. Heat transport loop ignored"

Answer
You may have forgotten to create a nodal distribution under User Data with a name called "OpenLoop". The distribution is to help the plugin identify where the OpenLoop systems are located, and which OpenLoop groups the nodes belong to.  
Be careful, this feature is case sensitive so always use the exact name as: OpenLoop  - see figure 2 in FEFLOW interface. 

 

Fig 2 - OpenLoop in FEFLOW interface