[FLASH-USERS] The better the grid accuracy, the more fluctuations and instability may occur in the calculation results

[lizy]

Dear Flash Developer, 

I used two types of uniform grids, - nxb=256- nyb=128 and - nxb=128- nyb=56, respectively, but the results of the calculations were very different. The results of the more precise grid calculations were actually very inaccurate, and the density and other data were randomly distributed. What is the reason?

In addition, I want to use multi-core operations. After setting it in flash. par, I entered mpirun - np 2 flash 4.8 but encountered an error. Should this command be performed before the ./setup command?

Thank you very much for your answer

Lizy
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