[MITgcm-support] arbitrary tiles in cube-sphere grid

[Yuan Lian]

Hi Martin,

Thanks! This is interesting. I never thought this would work when there 
are several subtiles in "y" direction.

I just tried your configuration but it didn't make apparent difference. 
I attached a figure that compares the two setups side-by-side. The 
vertical velocity is shown for 1000 time steps. They "patchy" values are 
visible in the left panel but vanish in the right panel. The overall 
values look different too. The configuration in the left panel will get 
worse when I run the simulation longer.

In the left panel, I used

PARAMETER (
&            sNx =   8,
&            sNy =   4,
&            OLx =   4,
&            OLy =   4,
&            nSx =   2,
&            nSy =   2,
&            nPx =  12,
&            nPy =   1,
&            Nx  = sNx*nSx*nPx,
&            Ny  = sNy*nSy*nPy,
&            Nr  =  56)

In the right panel, I used

PARAMETER (
&            sNx =   8,
&            sNy =   8,
&            OLx =   4,
&            OLy =   4,
&            nSx =   1,
&            nSy =   2,
&            nPx =  12,
&            nPy =   1,
&            Nx  = sNx*nSx*nPx,
&            Ny  = sNy*nSy*nPy,
&            Nr  =  56)


Any thoughts on these? Thanks!

Best regards,
Yuan



On 3/24/12 12:31 AM, Martin Losch wrote:
> Hi Yuan,
>
> I may be wrong about this, but I think that with the cube-sphere grid you need to put all tiles "in a row", so instead of nPx=12, nPy=4, you need to have nPx=48, nPy=1
>
> I don't know anything about the Shapiro filter.
>
> Martin
>
> On Mar 24, 2012, at 6:54 AM, Yuan Lian wrote:
>
>> Hi,
>>
>> I have a question about setting arbitrary tiles in cube-sphere grid. I don't have any problems using the regular six-tile configuration. However, there are "patchy" values (more obvious in vertical or meridional velocity) near the corners of subtiles if I use the following SIZE.h
>>
>>       PARAMETER (
>> &            sNx =   8,
>> &            sNy =   4,
>> &            OLx =   4,
>> &            OLy =   4,
>> &            nSx =   1,
>> &            nSy =   1,
>> &            nPx =  12,
>> &            nPy =   4,
>> &            Nx  = sNx*nSx*nPx,
>> &            Ny  = sNy*nSy*nPy,
>> &            Nr  =  56)
>>
>> It appears that either EXCH2 routine or Shapiro filter does not work properly in this case.
>>
>> Does anyone also notice the problem?
>>
>> Best regards,
>> Yuan
>>
>>
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-support
> Martin Losch
> Martin.Losch at awi.de
>
>
>
>
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support

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