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arxiv: 2604.21867 · v1 · submitted 2026-04-23 · ❄️ cond-mat.mtrl-sci

Recognition: unknown

Extending Hamiltonian-Adaptive Resolution Simulation to Interfaces: An Updated LAMMPS Implementation and Application to Porous Solids

Hari Haran Sudhakar (1) , Alessandra Serva (1 , 2) , Rocio Semino (1) ((1) Sorbonne Universit\'e , CNRS , Physicochimie des \'Electrolytes et Nanosyst\`emes Interfaciaux , F-75005 , Paris
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France. (2) R\'eseau sur le Stockage Electrochimique de l'Energie (RS2E) FR CNRS 3459 80039 Amiens Cedex France)
Authors on Pith no claims yet

Pith reviewed 2026-05-09 21:07 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords H-AdResSadaptive resolutionLAMMPSporous solidsinterfacesfluctuating densitymetal-organic frameworksdual-resolution simulation
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The pith

Updated H-AdResS in LAMMPS preserves atomistic structural and dynamic properties at interfaces with fluctuating density while raising efficiency.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper extends the Hamiltonian-Adaptive Resolution Simulation method inside the LAMMPS package so that atomistic and coarse-grained models can coexist inside one box even when local density varies. New compensation routines are added to remove boundary artifacts that would otherwise appear when particles cross the resolution boundary. Benchmarks on liquid water confirm that the atomistic subdomain reproduces the radial distribution functions, diffusion coefficients, and other observables of a pure atomistic run. The same setup is then used to study gas adsorption and transport inside a metal-organic framework, again showing that the detailed region remains statistically identical to a fully atomistic reference while the simulation runs faster overall.

Core claim

The revised compensation routines in the LAMMPS H-AdResS implementation correctly cancel resolution-interface artifacts even under density fluctuations. Consequently, structural and dynamic properties measured inside the atomistic subdomain of a dual-resolution simulation are statistically indistinguishable from those obtained in an equivalent fully atomistic simulation, while the overall computational cost is reduced.

What carries the argument

Hamiltonian-Adaptive Resolution Simulation (H-AdResS) with revised compensation routines that enforce thermodynamic consistency across the atomistic-to-coarse-grained boundary under fluctuating density.

If this is right

  • Atomistic subdomains embedded in mixed-resolution interface simulations can be treated as faithful representations of fully atomistic physics.
  • Simulation throughput increases for systems containing both dense atomistic zones and larger coarse-grained surroundings, such as porous solids.
  • Preparation of dual-resolution input files is simplified by new LAMMPS commands that accept a wider range of pair potentials.
  • The approach directly supports modeling of gas adsorption and transport inside metal-organic frameworks without loss of local accuracy.
  • The same machinery extends to other fluctuating-density interfaces encountered in energy-storage and membrane applications.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The method could be applied to liquid-solid or liquid-gas interfaces where only a thin layer near the boundary needs atomistic detail.
  • Systematic tests on electrolytes or catalytic surfaces would reveal whether the efficiency gain remains when electrostatics or reactive chemistry are present.
  • The framework invites coupling to other adaptive-resolution schemes that operate on different time scales.
  • Quantitative mapping of the speed-up versus the size of the coarse-grained region would help users decide when the dual-resolution overhead is justified.

Load-bearing premise

The new compensation routines fully eliminate any spurious forces or energy mismatches at the resolution interface even when the local particle density changes with time.

What would settle it

Run a side-by-side comparison of a water box in pure atomistic mode versus dual-resolution mode and measure the oxygen-oxygen radial distribution function or self-diffusion constant inside the atomistic subdomain; a statistically significant deviation would falsify the claim.

Figures

Figures reproduced from arXiv: 2604.21867 by 2), 80039 Amiens Cedex, Alessandra Serva (1, CNRS, F-75005, France), France. (2) R\'eseau sur le Stockage Electrochimique de l'Energie (RS2E), FR CNRS 3459, Hari Haran Sudhakar (1), Paris, Physicochimie des \'Electrolytes et Nanosyst\`emes Interfaciaux, Rocio Semino (1) ((1) Sorbonne Universit\'e.

Figure 1
Figure 1. Figure 1: FIG. 1. Schematic representation of the Hamiltonian [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Commands and functions highlighted in blue were [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. ZIF-8/CO [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Radial distribution function, g(r), of the O–O pair in [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Radial distribution functions, g(r), obtained from the [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Radial distribution functions, g(r), of (i) Zn–Zn (ii) [PITH_FULL_IMAGE:figures/full_fig_p007_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Density profile of CO [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Mean squared displacement (MSD) of CO [PITH_FULL_IMAGE:figures/full_fig_p008_8.png] view at source ↗
read the original abstract

Many natural phenomena involve processes that happen simultaneously at different characteristic length- and timescales. Typically, the region where the process of interest happens is affected by fluctuations in its surroundings. Modeling these systems requires an effective combination of simulation resolutions. The Hamiltonian-Adaptive Resolution Simulation (H-AdResS) method allows to model dual-resolution systems in length- and time-scales compatible with molecular diffusion, by combining atomistic and particle-based coarse graining models in the same simulation box. In this work, a new implementation of H-AdResS is provided in LAMMPS 2023. New features extend the usage to more diverse interaction potentials and simplify the preparation of input files via dedicated lammps input commands, while keeping the efficiency gain of the basis method. The implementation is benchmarked by reproducing water properties from a reference atomistic simulation. Importantly, the new implementation includes changes in compensation routines allowing to simulate systems with fluctuating density. As an example, the method in its new implementation is applied to modeling a porous metal-organic framework and its gas adsorption structure and transport properties. We demonstrate that structural and dynamic properties in the atomistic region of the dual-resolution scheme are unaffected and remain those of the fully atomistic system, while increasing simulation efficiency. This paves the way for using H-AdResS to simulate complex interfaces across applications in energy storage, electrocatalysis, and membrane technologies.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 3 minor

Summary. The manuscript presents an updated LAMMPS 2023 implementation of Hamiltonian-Adaptive Resolution Simulation (H-AdResS) that extends the method to interfaces with fluctuating densities. New features support a wider range of interaction potentials and simplify input preparation via dedicated commands. The implementation is benchmarked by direct comparison to fully atomistic reference simulations for water structural and dynamic properties, then applied to gas adsorption and transport in a porous metal-organic framework (MOF). The central claim is that atomistic-region properties remain identical to the pure atomistic case while computational efficiency increases, enabled by revised compensation routines that cancel interface artifacts under density fluctuations.

Significance. If the central claim holds, the work supplies a practical, open-source tool for efficient multiscale modeling of complex interfaces in porous solids and related materials applications (energy storage, membranes, electrocatalysis). The direct validation against independent atomistic references and the demonstration on a realistic MOF system with fluctuating density add concrete utility; the simplified LAMMPS commands lower the barrier for adoption.

major comments (2)
  1. [Compensation routines] Compensation routines section: the manuscript asserts that the updated routines correctly cancel artifacts even when density fluctuates, yet provides no explicit test (e.g., force balance or density-profile comparison across the interface with/without the new terms) that isolates this cancellation from the overall benchmark. This is load-bearing for the claim that the atomistic zone is unaffected.
  2. [MOF application] MOF application (results section): the statement that atomistic-region metrics are 'unaffected' is supported only by qualitative agreement with the fully atomistic reference; quantitative error bars, block-averaging details, and total simulation lengths are not reported, making it impossible to judge whether small differences fall within statistical uncertainty.
minor comments (3)
  1. [Figures and results] Figure captions and text should explicitly state the number of independent runs and total sampling time used for each reported property (water benchmark and MOF).
  2. [Abstract and introduction] The abstract and introduction would benefit from a one-sentence statement of the precise algorithmic change in the compensation term that enables fluctuating-density simulations.
  3. [Benchmarks] A short table comparing wall-clock times or speed-up factors between the dual-resolution and fully atomistic runs would make the efficiency claim more concrete.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their positive assessment and constructive comments, which help clarify key aspects of the validation. We address each major comment below and will incorporate revisions to strengthen the presentation of the compensation routines and the MOF results.

read point-by-point responses

  1. Referee: Compensation routines section: the manuscript asserts that the updated routines correctly cancel artifacts even when density fluctuates, yet provides no explicit test (e.g., force balance or density-profile comparison across the interface with/without the new terms) that isolates this cancellation from the overall benchmark. This is load-bearing for the claim that the atomistic zone is unaffected.

    Authors: We appreciate the referee highlighting the value of an isolated demonstration. The manuscript's primary validation relies on direct comparison of structural and dynamic properties to fully atomistic references in both the water benchmark (which includes interface regions) and the MOF application (where density fluctuates at the hybrid interface). These overall agreements support that artifacts are canceled. However, we agree that an explicit isolation would be stronger. In the revised manuscript we will add a new figure or subsection in the methods or results showing density profiles and force balance across the interface with and without the updated compensation terms, directly demonstrating cancellation under fluctuating densities. revision: yes

  2. Referee: MOF application (results section): the statement that atomistic-region metrics are 'unaffected' is supported only by qualitative agreement with the fully atomistic reference; quantitative error bars, block-averaging details, and total simulation lengths are not reported, making it impossible to judge whether small differences fall within statistical uncertainty.

    Authors: We agree that quantitative statistical details are necessary to rigorously support the 'unaffected' claim. The current text presents visual agreement in figures for adsorption structure and transport properties. In the revised manuscript we will expand the MOF results section to report total simulation lengths, the block-averaging procedure (including block size and number of blocks), and error bars (standard errors from block averages) for all compared metrics. This will allow readers to assess whether any small differences lie within statistical uncertainty. revision: yes

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper's central claim—that structural and dynamic properties inside the atomistic subdomain remain identical to a pure atomistic reference—is established by direct benchmarking against independent fully atomistic simulations of water and by application to a porous MOF. No derivation step reduces by construction to a fitted parameter, self-definition, or load-bearing self-citation; the new compensation routines are validated empirically rather than assumed, and the implementation changes are presented as enabling features tested against external references. The analysis is therefore self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the established correctness of the original H-AdResS switching and compensation framework plus the assumption that the new LAMMPS routines preserve that correctness under fluctuating density.

axioms (1)
  • domain assumption The H-AdResS resolution-switching function and compensation potential eliminate interface artifacts when density is allowed to fluctuate.
    Invoked when the authors state that the updated compensation routines enable fluctuating-density simulations while preserving atomistic properties.

pith-pipeline@v0.9.0 · 5647 in / 1238 out tokens · 29615 ms · 2026-05-09T21:07:02.573713+00:00 · methodology

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Reference graph

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