[FLASH-USERS] Using scratch variables

[vgop at lle.rochester.edu]

Thank you! That seems like it’s fixed the problem. 

 

From: Ji, Suoqing <suoqing at caltech.edu> 
Sent: Monday, March 25, 2019 5:31 PM
To: vgop at lle.rochester.edu
Cc: flash-users at flash.uchicago.edu
Subject: Re: [FLASH-USERS] Using scratch variables

 

Hi Varchas, 

 

I suspect you might get the wrong pointer for the scratch variables (not the way of getting solnData). You could get the correct pointer for the scratch variables by calling

 

call Grid_getBlkPtr(blockId, scrtData, SCRATCH_CTR)


Best regards,
—
Suoqing Ji
Sherman Fairchild Fellow
TAPIR & Walter Burke Institute for Theoretical Physics
California Institue of Technology
 <http://www.tapir.caltech.edu/~suoqing> http://www.tapir.caltech.edu/~suoqing 





On Mar 25, 2019, at 2:11 PM, vgop at lle.rochester.edu <mailto:vgop at lle.rochester.edu>  wrote:

 

Dear community,

 

Has anyone had experience with using scratch variables in FLASH? I’d like to have a scratch variable to keep track of some index values between time steps to speed up a table lookup. My first try was to use 

 

SCRATCHCENTERVAR RIDX 

 

In my Config file, and then try to read from/write to the scratch variable by referencing 

 

blkPointer(RIDX_SCRATCH_VAR,I,j,k)

 

However, it seems like in Flash.par, RIDX_SCRATCH_CENTER_VAR has the same value as DENS_VAR, which leads to a rather unfortunate series of errors whenever I write to it and instead end up overwriting DENS_VAR. Does anyone have advice with how I should actually go about reading/writing the scratch vars?

 

Thanks,

Varchas Gopalaswamy 

PhD Candidate, Laboratory for Laser Energetics, 

Department of Mechanical Engineering

University of Rochester

 

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