[Developers] Evolving grid arrays in time

[Erik Schnetter]

I want to evolve geodesics, which are stored in grid arrays.  I'm  
looking for a way to make this work.  This may have to involve some  
trickery, such as defining your own time levels.  I'll send more  
information once I found a good way.

-erik

On Sep 26, 2007, at 18:36:12, Tanja Bode wrote:

> Hi,
>
> Has there been any further work done on evolving grid arrays in  
> time with
> MoL since the discussion last year?
>
> Thanks,
> Tanja
>
>
>
> On Mon, 4 Sep 2006, Ian Hawke wrote:
>
>> On Tue, 2006-08-29 at 19:19 -0500, Erik Schnetter wrote:
>>> It is currently not possible to evolve grid arrays in time with MoL
>>> when using mesh refinement.  At the moment, MoL would evolve grid
>>> arrays multiple times per time step -- once for each refinement
>>> level.  I am toying with different ideas to make Carpet, MoL, and
>>> grid arrays work together.
>>
>>> MoL would need additional code to ensure that grid arrays are  
>>> evolved
>>> only in global mode.
>>>
>>> When grid functions are evolved in time, one cannot access the  
>>> values
>>> of grid arrays which are also evolved in time.  This is so because
>>> their time stepping is non commensurable.
>>>
>>> Comments?
>>
>> This final point was the thing that made me think that it wasn't  
>> worth
>> doing, as there are few tasks that I could think of fitting this  
>> scheme
>> that couldn't be done with much less effort by post-processing. I  
>> would
>> only see the value if the evolved grid array was going to be used  
>> in the
>> evolution, and hence their values will need to be accessed.
>>
>> It might be possible to allow this with a careful use of  
>> timelevels, but
>> that would require quite a bit of communication between Carpet and  
>> MoL I
>> would think.
>>
>> Ian
>>
>>
>>
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>
>
>
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-- 
Erik Schnetter <schnetter at cct.lsu.edu>

My email is as private as my paper mail.  I therefore support encrypting
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