NSfracStep start_timestep_hook/temporal_hook

[Tom303-afk]

Good evening,

In my attempt to add a 2-element windkessel afterload to the outlet boundary of a 3d tube, I am trying to calculate the pressure from this 2-element windkessel system in temporal_hook() and to apply this pressure to the outlet in start_timestep_hook.
However, when I return this variable (calculated pressure) in a dictionary in temporal_hook, it does not save and it just stays 0.

How can I add a variable to the NSfracStep-problem that updates for every timestep, starting at 0?

With kind regards,