[Developers] Evolving grid arrays in time

Tanja Bode tbode at gravity.psu.edu
Wed Sep 26 11:36:12 CDT 2007


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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