Ask for help for Neumann boundary conditions of temperature

Hi all,
Can anyone tell me how can I set a Neumann boundary conditions for temperature in ASPECT, i.e., by specifying the expected heat flux on a surface?
It is mentioned a plugin has been implemented in ASPECT Hackathon 2018 Final report but I have no idea about how to use this plugin.
Sorry if this interrupt you.


This is the parameter section “Boundary heat flux model”. You can look at for example. There is currently no cookbook or benchmark that uses it, as far as I know.

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Many thanks!