[FLASH-USERS] Random seed using blockId

[Hansen, Eddie]

Hi Pedro,

This is a previous approach that I had tried, but I tend to do randomization like this differently now. You can start the random number generator with sim_seed in the Simulation_init routine instead. Then just get and use random numbers in Simulation_initBlock. This has the benefit of making a domain random (without periodicity) but repeatable.

--
Eddie Hansen
Research Scientist
Flash Center for Computational Science


From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of pedro romero <pedro.romero at greentownsbyfusion.com>
Date: Tuesday, July 25, 2023 at 7:30 AM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] Random seed using blockId
Good morning,

I am working on Z-pinch template, which uses blockId in order to stablish the random seed for every block. Nonetheless, I have checked that blockId has always the value 1 for every block, hence the random seed used (defined as sim_seed*blockId) is always the same and every block has the same structure on random perturbations, which leads to numerical, spurious periodicities.

Is there an easy way to correct this, getting realistic (non-repeated among blocks) random perturbations?

Thank you in advance,
Pedro
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