[Users] Excision with McLachlan

[Erik Schnetter]

Miguel

LegoExcision was never working satisfactorily, and is not supported any
more. The problem is (likely) that the characteristic velocities across the
Lego boundaries may not all have the same sign (outflowing). I thus
recommend to use a smooth excision surface, as Jonah suggests below.

Using excision for the hydrodynamic quantities, if done inside the black
hole, is also possible, but that is usually combined with punctures for the
geometry.

-erik


On Mon, Mar 27, 2017 at 10:59 AM, Jonah Miller <
jonah.maxwell.miller at gmail.com> wrote:

> Hi Miguel,
>
> I'm not sure about excising dynamically during evolution--maybe someone
> else has insight there. However, excision is definitely possible. I have
> been using the sixpatches Llama thorn to perform excision for a single
> black hole. I attach a parameter file to excise a Kerr-Schild black hole
> that I based my simulations on.
>
> Best,
>
> Jonah
>
>
>
> On 2017-03-27 05:01 AM, Miguel Zilhão wrote:
>
>> hi all,
>>
>> i was wondering whether one could straightforwardly use the ET to perform
>> black hole
>> evolutions using excision instead of punctures.
>>
>> specifically, i had in mind a collapsing configuration where i'd like to
>> excise the inner
>> domain once a black hole horizon is formed... is this possible?
>> i had a look around and noticed the LegoExcision thorn, but i'm not sure
>> whether it's
>> actively maintained, nor whether it can interface with McLachlan...
>>
>> thanks,
>> Miguel
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>>
>
>
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-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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