[Users] Issue with thorn Trigger

[Lorenzo Ennoggi]

Dear all,
I would like to restart a simulation from a checkpoint enlarging the finest
refinement level in my grid. In particular, I would like to change
CarpetRegrid2::radius_1[5]
= 20.1 to CarpetRegrid2::radius_1[5] = 25. I tried to do that by making the
parameter CarpetRegrid2::radius_1 always steerable and adding the
following lines to my parameter file:


ActiveThorns                                = "Trigger"
Trigger::Trigger_Number                     = 1

Trigger::Trigger_Checked_Variable[0]        = "hydrobase::rho"
Trigger::Trigger_Relation[0]                = ">"
Trigger::Trigger_Checked_Value[0]           = 1.e-4
Trigger::Trigger_Reduction[0]               = "maximum"

Trigger::Trigger_Reaction[0]                = "steerparam"
Trigger::Trigger_Steered_Parameter_Thorn[0] = "CarpetRegrid2"
Trigger::Trigger_Steered_Parameter_Name[0]  = "radius_1[5]"
Trigger::Trigger_Steered_Parameter_Value[0] = "25." #New value of the above
parameter
Trigger::Trigger_Once[0]                    = 1     #It means "yes"
Trigger::Trigger_Debug                      = 1     #It means "yes"


In this way, the trigger should act immediately, as the maximum of rho is
~1e-3 in my case. Indeed, it looks like the trigger is working fine, as the
standard output says

[...]
INFO (Trigger): Testing triggers
INFO (Trigger): last_checked: -1
INFO (Trigger): reducing trigger 0 red_handle 2 varindex 428
INFO (Trigger): reducing was ok
INFO (Trigger): trigger nr. 0 fullfilled for rho (0.000804>0.000100)
INFO (Trigger): Steering parameter
INFO (Trigger): Parameter steered
[...]

but unfortunately, looking at the 2D output with VisIt, the finest
refinement level does not get enlarged (i.e. radius_1[5] does not appear to
have been steered at all). Do you have any suggestions on how to get this
trigger to work? Or, are you aware of other ways of obtaining the same
result without using the thorn Trigger?

I attach the parameter file in case you need it.

Thank you very much in advance for your help.

Sincerely,
Lorenzo Ennoggi
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