[Carpet] CarpetRegrid2: is it possible to activate new levels (PMR)?

[Bruno Giacomazzo]

Christian, Peter and Erik,
 	thank you very much for your answers.

 	What I want to do is actually the following: I have three regions 
with three refinement levels. At a certain time I want to "switch on" one 
more level on region 3 to increase the resolution in that area.

 	I have seen that the parameter num_levels_3 is STEERABLE and so I 
thought that it would have worked simply changing it. I will use the 
scalar variable as suggested.

 	But then what it's the meaning of declaring a variable 
STEERABLE=always if changing it doesn't have any effect during the 
evolution?

Cheers,
Bruno

On Mon, 10 Dec 2007, Peter Diener wrote:

> Hi Bruno,
>
> As far as I know, this functionality has been moved from a parameter to
> a grid scalar.
>
> In CarpetRegrid2's interface.ccl you'll find the definition of a public
> grid scalar:
>
> CCTK_INT num_levels[10] TYPE=scalar
> {
>   num_levels
> } "Number of refinement levels"
>
> That you can modify. Of course you'll have to set the new region's
> position and radius as well by setting the corresponding grid scalars.
>
> Cheers,
>
>   Peter
>
> On Mon, 10 Dec 2007, Christian D. Ott wrote:
>
>>
>> Hi Bruno,
>>
>> On Mon, Dec 10, 2007 at 03:25:21PM +0100, Bruno Giacomazzo wrote:
>>>  	I'm using the experimental version of Carpet and I would like to
>>> know if CarpetRegrid2 can add new levels during the evolution.
>>> CarpetRegrid had this function through the use of
>>> activate_levels_on_regrid, but I was not able to find something similar in
>>> CarpetRegrid2.
>>>
>>>  	Actually I have seen that the parameter num_levels_* is
>>> STEERABLE=always. Has anybody tried to change it during evolution?
>>
>> I don't know the answer to your question, yet I do know that you can
>> continue using CarpetRegrid with carpet-experimental. Personally, I
>> find it more convenient to stick with CarpetRegrid as I am used to it.
>> Any particular reason you need CarpetRegrid2 to do PMR?
>>
>> - Christian
>>
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>>
>>
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>

-- 
Dr. Bruno Giacomazzo
Max Planck Institute for Gravitational Physics
Albert Einstein Institute
Am Muehlenberg 1
D-14476 Potsdam
Germany

Tel.  : +49 331 567 7183
Fax   : +49 331 567 7252
cell. : +49 173 826 4488
email : bgiacoma at aei.mpg.de

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