[Wien] VK-COUL not well converged: Increase GMAX or decrease NCON

[Dr. K. C. Bhamu]

Dear Tran,
Thanks for explaining the meaning of warnings.
Yes,  warning disappears by  increasing Gmax to 14.

What is mean by NCON?
In which file it is written and is there any batch command to increase it?

Regards
Bhamu

On Sun, Aug 25, 2019 at 4:17 PM <tran at theochem.tuwien.ac.at> wrote:

> This is a warning from lapw0, which indicates that the Fourier expansion
> of the Coulomb potential may not be well converged. Increase GMAX in
> case.in2 to 16 to see if this warning disappears.
>
>
> On Sunday 2019-08-25 12:10, Dr. K. C. Bhamu wrote:
>
> >Date: Sun, 25 Aug 2019 12:10:49
> >From: Dr. K. C. Bhamu <kcbhamu85 at gmail.com>
> >Reply-To: A Mailing list for WIEN2k users <
> wien at zeus.theochem.tuwien.ac.at>
> >To: A Mailing list for WIEN2k users <Wien at zeus.theochem.tuwien.ac.at>
> >Subject: [Wien] VK-COUL not well converged: Increase GMAX or decrease NCON
> >
> >Dear Experts,
> >We are running a GGA-PBE calculation on a cubic double perovskite on
> Wien2k_19.1 with intel compilers with
> >
> > 8     10   6   ELPA pxq hm (R-MT*K-MAX,MAX L IN
> WF,V-NMT,lib,gridshape,hm/lm)
> >GMAX=12
> >We are getting VK-COUL error.
> >
> >Exact warning is this:  VK-COUL not well converged: Increase GMAX or
> decrease NCON
> >There is no information on mailing list and UG on this warning.
> >Could someone please explore the meaning of these warnings?
> >
> >PS: Running scf with dense k-mesh on a scf that was finished with
> Wien2k_18.2.
> >
> >regards
> >Bhamu
> >
> >
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