[Users] Users Digest, Vol 135, Issue 16

[Federico Cipolletta]

Hello Lorenzo,

I recall that I obtained something similar to what you are describing, when
attempting a regrinding for very small radii of the finest refinement level
(let's say a most refinement radius near 5.0).

I wasn't able to control precisely this setting and I concluded that it
could be related to the number of buffer/ghost zones that are required (of
course it also depends on the most refined resolution, though).

Adopting greater radii, instead, it seems that I could have better control.

I am sorry of not being of any more help and I wonder if someone could add
more.

Best regards,
Federico Cipolletta.

Il lun 14 giu 2021, 11:45 <users-request at einsteintoolkit.org> ha scritto:

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> Today's Topics:
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>    1. Issue with thorn Trigger (Lorenzo Ennoggi)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 14 Jun 2021 11:45:37 +0200
> From: Lorenzo Ennoggi <lorenzo.ennoggi at gmail.com>
> Subject: [Users] Issue with thorn Trigger
> To: users at einsteintoolkit.org
> Message-ID:
>         <CAG9ZJAyU0akW7iOrViD5OSHENw5_soDVNS=
> T1N+TgFtoV9u_aw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 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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