<div dir="auto">Hello Lorenzo,<div dir="auto"><br></div><div dir="auto">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).</div><div dir="auto"><br></div><div dir="auto">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).</div><div dir="auto"><br></div><div dir="auto">Adopting greater radii, instead, it seems that I could have better control.</div><div dir="auto"><br></div><div dir="auto">I am sorry of not being of any more help and I wonder if someone could add more.</div><div dir="auto"><br></div><div dir="auto">Best regards,</div><div dir="auto">Federico Cipolletta.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il lun 14 giu 2021, 11:45 <<a href="mailto:users-request@einsteintoolkit.org">users-request@einsteintoolkit.org</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Users mailing list submissions to<br>
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Today's Topics:<br>
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1. Issue with thorn Trigger (Lorenzo Ennoggi)<br>
<br>
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Message: 1<br>
Date: Mon, 14 Jun 2021 11:45:37 +0200<br>
From: Lorenzo Ennoggi <<a href="mailto:lorenzo.ennoggi@gmail.com" target="_blank" rel="noreferrer">lorenzo.ennoggi@gmail.com</a>><br>
Subject: [Users] Issue with thorn Trigger<br>
To: <a href="mailto:users@einsteintoolkit.org" target="_blank" rel="noreferrer">users@einsteintoolkit.org</a><br>
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<br>
Dear all,<br>
I would like to restart a simulation from a checkpoint enlarging the finest<br>
refinement level in my grid. In particular, I would like to change<br>
CarpetRegrid2::radius_1[5]<br>
= 20.1 to CarpetRegrid2::radius_1[5] = 25. I tried to do that by making the<br>
parameter CarpetRegrid2::radius_1 always steerable and adding the<br>
following lines to my parameter file:<br>
<br>
<br>
ActiveThorns = "Trigger"<br>
Trigger::Trigger_Number = 1<br>
<br>
Trigger::Trigger_Checked_Variable[0] = "hydrobase::rho"<br>
Trigger::Trigger_Relation[0] = ">"<br>
Trigger::Trigger_Checked_Value[0] = 1.e-4<br>
Trigger::Trigger_Reduction[0] = "maximum"<br>
<br>
Trigger::Trigger_Reaction[0] = "steerparam"<br>
Trigger::Trigger_Steered_Parameter_Thorn[0] = "CarpetRegrid2"<br>
Trigger::Trigger_Steered_Parameter_Name[0] = "radius_1[5]"<br>
Trigger::Trigger_Steered_Parameter_Value[0] = "25." #New value of the above<br>
parameter<br>
Trigger::Trigger_Once[0] = 1 #It means "yes"<br>
Trigger::Trigger_Debug = 1 #It means "yes"<br>
<br>
<br>
In this way, the trigger should act immediately, as the maximum of rho is<br>
~1e-3 in my case. Indeed, it looks like the trigger is working fine, as the<br>
standard output says<br>
<br>
[...]<br>
INFO (Trigger): Testing triggers<br>
INFO (Trigger): last_checked: -1<br>
INFO (Trigger): reducing trigger 0 red_handle 2 varindex 428<br>
INFO (Trigger): reducing was ok<br>
INFO (Trigger): trigger nr. 0 fullfilled for rho (0.000804>0.000100)<br>
INFO (Trigger): Steering parameter<br>
INFO (Trigger): Parameter steered<br>
[...]<br>
<br>
but unfortunately, looking at the 2D output with VisIt, the finest<br>
refinement level does not get enlarged (i.e. radius_1[5] does not appear to<br>
have been steered at all). Do you have any suggestions on how to get this<br>
trigger to work? Or, are you aware of other ways of obtaining the same<br>
result without using the thorn Trigger?<br>
<br>
I attach the parameter file in case you need it.<br>
<br>
Thank you very much in advance for your help.<br>
<br>
Sincerely,<br>
Lorenzo Ennoggi<br>
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