[Users] Users Digest, Vol 135, Issue 16

[Lorenzo Ennoggi]

Hi Federico,
great to hear from you! And thank you for your quick answer. So you are
suggesting to enlarge the finest refinement level a bit more, right?

Thank you,
Lorenzo

Il giorno lun 14 giu 2021 alle ore 11:56 Federico Cipolletta <
cipo87 at gmail.com> ha scritto:

> 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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