[Users] Users Digest, Vol 135, Issue 16

[Federico Cipolletta]

That could be one easy workaround, but it specifically depends on your
needs (i.e. the region in which you need more accuracy, the resolution you
are interested in and most of all the resources that are available to you).

Best,
Federico Cipolletta.

Il lun 14 giu 2021, 12:06 Lorenzo Ennoggi <lorenzo.ennoggi at gmail.com> ha
scritto:

> 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:
>>>
>>>    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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