[Users] Excision with McLachlan

[Miguel Zilhão]

hi all,

many thanks for the many replies, in particular to Jonah for providing the parameter file!
i have just a couple of follow up questions:

  - what sort of boundary conditions are imposed on the evolved variables inside the excised region, 
and how is this controlled?

  - would it then be possible to do this dynamically, ie, start excising only when a certain 
condition (like formation of an apparent horizon) is fulfilled?

and for my purposes having a single excised region is fine, the setup i have in mind would be a 
collapse to a single black hole.

thanks,
Miguel


On 27/03/17 16:59, Jonah Miller 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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