Questions tagged [lammps]
For questions about (or related to) the software LAMMPS.
36
questions
8
votes
0answers
42 views
LAMMPS input card in an NVIDIA GPU
I want to simulate the attached model for a Cu NP in Ar using my GPU, but I got erratic results. All looks well when I simulate it in my CPU with the command:
...
8
votes
0answers
36 views
Molecular dynamics with surfaces
I want to run molecular dynamics with LAMMPS, the aim is to simulate a platinum surface with a gas phase consisting of simple molecules. I would like to use periodic boundary conditions in order to ...
7
votes
1answer
83 views
Where to get Tersoff and SW potentials for LAMMPS
I want to do some molecular dynamics simulations for silicene with hydrogen and halogen atoms deposited at the surface. Where can I find Stillinger-Weber potentials to use for this? There doesn't seem ...
3
votes
0answers
75 views
Practical way to reduce pressure fluctuations in molecular dynamics?
I am running a test setup in LAMMPS. I am using $4000$ atom hcp system with MEAM potential.
The system need to be at equilibrium at $\pu{10K}$ and for this I am giving initial velocity at $\pu{10K}$ ...
12
votes
1answer
126 views
Creating Interatomic Potential for Lammps using DFT
What are the basic steps and methodologies used in creating inter-atomic potential (specially EAM, MEAM potentials) for metals ...
13
votes
2answers
88 views
Best protocol for finding liquid–solid coexistence curve in molecular dynamics?
I am trying to determine the melting temperature of an fcc metal as a function of pressure, which should give a liquid–solid phase diagram for this metal. For now, I'm not going to consider any ...
6
votes
2answers
79 views
LAMMPS data files, making atom IDs contiguous
I sometimes need to remove atoms from LAMMPS datafiles by hand, removing each row that corresponds to an atomID I want to remove, then decrementing the total atom count. This causes the atom IDs to no ...
4
votes
0answers
37 views
What will be the cohesive energy of an alloy in LAMMPS?
The cohesive energy of a pure material is generally termed as the energy of a unit cell divided by the number of atoms. what will be cohesive energy of an alloy in LAMMPS? I am running LAMMPS for $\ce{...
4
votes
1answer
61 views
Calculating Velocity autocorrelation function for Binary Diffusion Coefficient
I have been attempting for some time to evaluate the binary Diffusion coefficient of argon in a gas mixture with neon. From the literature, this property can be measured using the velocity ...
7
votes
1answer
86 views
Using LAMMPS for a small system
I want to run a classical molecular dynamics simulation on silicane using LAMMPS. Since I don't have access to any HPC nor do I have a powerful desktop PC, I'm planning on making the system small. By ...
5
votes
0answers
73 views
Cannot import both numpy and LAMMPS to python after installing with conda [closed]
I installed the module LAMMPS by using this command
conda install -c conda-forge lammps
I want to import LAMMPS to python code, but it says:
...
11
votes
1answer
219 views
Selection of appropriate Langevin damping parameter for MD of solid metal
I am performing an MD simulation involving solid metal. The system is in the NVT ensemble, and I am using the Langevin thermostat (fix Langevin in LAMMPS) to enforce this.
I have previously used the ...
10
votes
0answers
77 views
Using Molecular Dynamics as an experimentalist to study how much plastic work is converted to heat, does anyone have any comments on our paper? [closed]
When you load a metal and the deformation results in permanent plastic deformation, the input work should be converted into heat and thus dissipate. But for about 100 years people have struggled to ...
11
votes
1answer
59 views
Modelling nitrogen interstitial barrier to oxygen diffusion in metals
I want to study the effect of nitrogen interstitials on oxygen diffusion in metals and vice-versa. Would you suggest MSD calculations in LAMMPS to be a viable method for this? There aren't many ...
7
votes
0answers
41 views
Reaction simulation at specific temperature, pH and pressure [closed]
Can we design metal organic frameworks, layered double hydroxide using LAMMPS? How?
I want to synthesize a metal organic framework or such materials, and I want to ask if I put two to three chemicals ...
13
votes
0answers
130 views
Empirically determining thermostat damping factor
Is there a way to determine an appropriate thermostat damping factor given a timestep size and a numerical integration method?
I am computing a set of simulations in LAMMPS, using ReaxFF, tracking ...
6
votes
0answers
96 views
Fix deposit and USER-REAXC: pre-allocating memory for atoms when using LAMMPS with ReaxFF
I would like to use "fix deposit" with ReaxFF to add atoms to a simulation in which I deposit molecules on a surface.
I have built working scripts for my system with other force fields. ...
8
votes
2answers
213 views
Tools for structural analysis on LAMMPS trajectories
I have a very general question but still quite important since I didn't find convincing tools to get the structural analysis done for LAMMPS dump file (trajectories). I am looking for post processing ...
11
votes
1answer
139 views
How does one compute the boiling point of a liquid made of a particular molecule?
This question is in relation to Anomalous boiling point of "iso-" alkanes on Chemistry SE.
I want to compute the boiling point of the different isomers of an n-carbon alkane to check what ...
9
votes
2answers
143 views
How to build a simulation model for a molecular dynamics simulation
I have got aggregate of 4 non-protein compounds I would submit for molecular dynamics simulation. The problem is I can't find software capable to do that. Amber, GROMACS, LAMMPS, all of them require ...
8
votes
1answer
149 views
Modelling water using the TIP3P flexible system [closed]
I am modelling water using a TIP3P flexible system. I am using the pair, bond and angle parameters given on the LAMMPS webpage. I am trying to run an $NPT$ simulation at $298\,K$ and $1 \,\mathrm{atm}$...
8
votes
1answer
330 views
Using the VACF command in LAMMPS to get the velocity autocorrelation function
I am writing a simple Lennard-Jones fluid simulation in LAMMPS.
So far, I have outputted the temperature, volume, density, total energy, enthalpy, pressure, and all of it seems to be believable every ...
11
votes
0answers
111 views
Setting multiple new atype/dtype/itype with LAMMPS fix bond/create [closed]
When creating a new bond in a LAMMPS simulation with the command fix/bond create it is likely new angles/dihedrals/impropers be need to be set. This can be done with the atype/dtype/itype arguments ...
11
votes
1answer
403 views
What does the Neighbor command do in LAMMPS?
I frequently see LAMMPS codes, and almost all of them have the neighbor 0.5 bin command. I completely studied the LAMMPS manual for the neighbour command and did ...
10
votes
1answer
191 views
LAMMPS code that I wrote not behaving as expected. Some issue with the group & region commands
I am actually working on SARS-CoV-2 proteins. Specifically I am trying to tribologically disengage the Spike Glycoprotein from the Membrane protein using LAMMPS. The method is to use amorphous carbon ...
12
votes
0answers
131 views
Sample LAMMPS file for graphene growth on a metal surface [closed]
I am working with graphene growth on metal substrates. But I need some sample files to know if I am doing it in the right way because running multiple simulations in LAMMPS takes a lot of time. Can ...
9
votes
1answer
130 views
How can I calculate the Poisson ratio of an amorphous material with LAMMPS?
I noticed that we can calculate the Poisson ratio of a crystalline metals with LAMMPS. I wonder if we can use that example for a metallic glass! If no, is there any other way, with another software?
6
votes
0answers
63 views
How do I generate an aluminum force-field for a LAMMPS input file? [closed]
I have been assigned a project on the generation of a force-field of Al (aluminum) for a LAMMPS potential.
I have no idea how to proceed and what to do next. Can anyone please let me know how should I ...
20
votes
1answer
131 views
Why can't I reproduce the behavior of an H-saturated graphene flake?
I'm trying to simulate a graphene flake with its edge C atoms saturated by H atoms, in a temperature ramp from 300 K to 1600 K, using LAMMPS and the AIREBO potential proposed by Stuart et al. in 2000.
...
12
votes
0answers
120 views
Poiseuille flow by LAMMPS [closed]
I am trying to model 3D Poiseuille flow of an argon gas confined between two parallel platinum plates by using LAMMPS. I have one reference paper, as given in [1] below. I built my platinum structure ...
11
votes
0answers
298 views
How to convert a molecular structure made in Avogadro to a LAMMPS coordinate file? [closed]
I was trying to convert a crystal structure into a LAMMPS data file in Avogadro but whenever I type .lmpdat as an extension, it says "The file name is not valid". Can you tell me any ...
14
votes
1answer
1k views
How to rectify the error “Lost atoms: original 28437 current 3659” in LAMMPS?
I have modeled a complex structure of a protein and a Carbon nano-cone (used as an indenter to the protein) using PACKMOL. The LAMMPS data file of the complex structure consists of 4 atom types (C O N ...
14
votes
3answers
552 views
Is the DYNAMO code developed by LAMMPS still available?
In 2013 it was stated that v8.8 of DYNAMO was the version mostly used for the last 10-12 years.
However I am struggling to find the code repository. It was developed by the LAMMPS developers and is ...
18
votes
1answer
374 views
How to optimize zinc oxide bulk structure at certain pressure with LAMMPS
I am trying to simulate the Zinc oxide bulk structure (periodic) at constant pressure(0.0 ~ 20.0 GPa) to observe phase transition with LAMMPS.
However, I approached a problem that the fluctuating ...
15
votes
1answer
159 views
Why do interaction potential parametrizations of bulk systems not work for corresponding nano-systems?
I am studying several thermodynamics properties of crystalline iron oxides ($\ce{Fe3O4}$, $\gamma-\ce{Fe2O3}$) in their solid phases by MD simulations. At the moment, I am facing many difficulties in ...
16
votes
3answers
186 views
Does anyone know any software for MD simulation which include the effect of magnetic field?
I am interested to generate some configurations from MD simulations which include the presence of strong magnetic field. Does anyone know any software that has some functionality to do this?
