Hello,
I have read the VASP manual and found that those 2 tags can speed up your calculation but not affect on the converged energy.
I want to know whether LPLANE and NSIM tag have any impact on the energy?
There are many benchmarks performed by super computing centers and they usually test these tags, I can't find an example right now, but it might give you a place to look.
I think you should try it yourself for known systems. (E.g. H2 molecule, Cu crystal) I also wanted to increase the speed of my calculations before and tried using LREAL=.A instead of the default LREAL=.FALSE. The result is that I do not get the correct binding energy of H2 molecule.
You can also read the attached link which is related on speeding up VASP calculations.
https://www.researchgate.net/post/How_do_you_make_VASP_calculations_faster
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