[FLASH-USERS] Using scratch variables

[Ji, Suoqing]

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

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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