[CP2K-user] [CP2K:16670] AIMD Simulation of water

Thomas Kühne tkuehne at gmail.com
Sun Mar 6 16:07:58 UTC 2022
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Dear Niharendu Choudhury, 

the bare SCAN functional (without Grimme’s dispersion correction) is able to reasonable well describe intermediate-ranged vdW interactions. 
A manifestation of that is the particle density is already rather well reproduced contrary to most other semi-local XC functional. Since IMHO, 
the impact of Grimme’s dispersion correction is mainly on water’s density, it’s relevance when using the SCAN functional and obviously also 
for NVT simulations is much reduced. The good agreement with joint x-ray/neutron diffraction experiments, however, is mainly due to the use 
of elevated temperature, which is rather well known to mimic nuclear quantum effects. 

Greetings, 
Thomas Kühne

> Am 06.03.2022 um 08:41 schrieb Niharendu Choudhury <niharc2007 at gmail.com>:
> 
> Thanks Prof. Hutter for your interesting reply. My basic question is whether vdW correction  is required at all with the SCAN
> functional? Why I am asking this is because, even without using vdW correction, SCAN gives (see  PNAS 114, 10846-10851 (2017)) exceptionally
> good g(r) and other properties of water at 330K. 
> 
> Isn't it that SCAN already includes vdW correction  required for at least water an aqueous systems?
> Please comment.
> 
> Best regards
> Niharendu Choudhury
> 
> On Friday, March 4, 2022 at 2:32:08 PM UTC+5:30 jgh wrote:
> Hi 
> 
> There are by now many variations of the SCAN functional, some use an empirical vdW correction, 
> some don't. Many different variations have already be used for water simulations. 
> You need to go through the literature and pick the one you prefer. 
> 
> regards 
> 
> Juerg Hutter 
> 
> ________________________________________ 
> From: cp... at googlegroups.com <applewebdata://7EB00A85-4369-4BAE-80F0-0FAE28F0372B> <cp... at googlegroups.com <applewebdata://7EB00A85-4369-4BAE-80F0-0FAE28F0372B>> on behalf of Niharendu Choudhury <nihar... at gmail.com <applewebdata://7EB00A85-4369-4BAE-80F0-0FAE28F0372B>> 
> Sent: Friday, March 4, 2022 7:59 AM 
> To: cp2k 
> Subject: [CP2K:16665] Re: AIMD Simulation of water 
> 
> Any update about using following vdW potential with scan functional and scan PP? 
> 
> &vdW_POTENTIAL 
> Dear All Experts, 
> 
> DISPERSION_FUNCTIONAL PAIR_POTENTIAL 
> 
> &PAIR_POTENTIAL 
> 
> R_CUTOFF 40.0 
> 
> TYPE DFTD3 
> 
> D3_SCALING 1.0 1.324 0.0 
> 
> PARAMETER_FILE_NAME dftd3.dat 
> 
> ! REFERENCE_FUNCTIONAL SCAN 
> 
> &END PAIR_POTENTIAL 
> 
> &END vdW_POTENTIAL 
> 
> 
> Please comment if it is okay or any better way dir vdW is required for water with SCAN? 
> 
> Best regards 
> 
> Niharendu Choudhury 
> 
> 
> 
> 
> On Tuesday, March 1, 2022 at 1:55:09 PM UTC+5:30 Niharendu Choudhury wrote: 
> 
> Dear All Experts, 
> For bulk water I want to use GPW with SCAN and SCAN optimized pp as found at 
> https://github.com/juerghutter/GTH/blob/master/SCAN/POTENTIAL <https://github.com/juerghutter/GTH/blob/master/SCAN/POTENTIAL>. 
> 
> What should be the vdW potential? Is the following ok? 
> 
> &vdW_POTENTIAL 
> 
> DISPERSION_FUNCTIONAL PAIR_POTENTIAL 
> 
> &PAIR_POTENTIAL 
> 
> R_CUTOFF 40.0 
> 
> TYPE DFTD3 
> 
> D3_SCALING 1.0 1.324 0.0 
> 
> PARAMETER_FILE_NAME dftd3.dat 
> 
> ! REFERENCE_FUNCTIONAL SCAN 
> 
> &END PAIR_POTENTIAL 
> 
> &END vdW_POTENTIAL 
> 
> 
> Please comment if it is okay or any better way dir vdW is required for water with SCAN? 
> 
> Best regards 
> 
> Niharendu Choudhury 
> 
> 
> On Thursday, February 17, 2022 at 2:51:45 PM UTC+5:30 Niharendu Choudhury wrote: 
> Thanks Ivan, for your prompt help and for referring to such an excellent review, which currently I am going through. 
> I'll try to run with SCAN and if any further difficulty appears, I will write to the list again. 
> 
> Best regards 
> Niharendu Choudhury 
> 
> On Wednesday, February 16, 2022 at 12:21:05 PM UTC+5:30 igladi... at gmail.com <applewebdata://7EB00A85-4369-4BAE-80F0-0FAE28F0372B> wrote: 
> Hi 
> yes CP2K with SCAN is possible, see 
> 
> https://groups.google.com/g/cp2k/c/hKU0yMZXzfU/m/HxaWxHx9BwAJ <https://groups.google.com/g/cp2k/c/hKU0yMZXzfU/m/HxaWxHx9BwAJ> 
> 
> There are also the pseudopotential for SCAN 
> 
> https://groups.google.com/g/cp2k/c/k0M3XuOdIHI/m/TEeDFRMwAAAJ <https://groups.google.com/g/cp2k/c/k0M3XuOdIHI/m/TEeDFRMwAAAJ> 
> 
> Regarding DFT for water, you can start from here 
> 
> https://doi.org/10.1063/1.4944633 <https://doi.org/10.1063/1.4944633> 
> 
> Hope it helps 
> 
> Ivan 
> 
> 
> On Tuesday, February 15, 2022 at 2:47:00 PM UTC+3 nihar... at gmail.com <applewebdata://7EB00A85-4369-4BAE-80F0-0FAE28F0372B> wrote: 
> Dear experts, 
> I found (PNAS 114, 10846-10851 (2017)) that SCAN (strongly constrained and appropriately normed) functional is very good for water properties. Do we have this option in CP2K? 
> 
> Can anybody suggest me (any review or so) regarding which functional is the best for water simulations? 
> 
> Warm regards 
> Niharendu Choudhury 
> 
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==============================
Thomas D. Kühne
Dynamics of Condensed Matter
Chair of Theoretical Chemistry
University of Paderborn
Warburger Str. 100
D-33098 Paderborn
Germany
thomas.kuehne at upb.de
+49/(0)5251/60-5726

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