WARNING: No fixes with time integration, atoms won't move (src/verlet.cpp:60)

LAMMPS
1

I’m diving into Lammps for the first time, and despite completing the installation process, I’ve encountered hurdles while testing various input scripts. Unfortunately, every code I run triggers that error message, despite seeking assistance from ChatGPT, which supposedly debugged the code the error still pops off. I’m grateful for any help you can provide

# LAMMPS input script for simulating argon atoms with time integration

# Initialize simulation
units           lj
dimension       3
boundary        p p p
atom_style      atomic

# Define system and atoms
lattice         fcc 0.8442
region          box block 0 10 0 10 0 10
create_box      1 box
create_atoms    1 box
mass            1 39.948    # Atomic mass of Argon

# Set Lennard-Jones potential
pair_style      lj/cut 2.5
pair_coeff      1 1 0.0103 3.405    # epsilon (energy), sigma (distance)

# Specify initial conditions
velocity        all create 1.0 87287 loop geom

# Time integration fix (Velocity Verlet)
fix             1 all nve

# Run simulation
timestep        0.005
thermo_style    custom step temp pe
thermo          100
run             1000
2

This is not a recommended, from the few tests I made, ChatGPT is not great at writing consistent inputs.

What error? The title of you post is a Warning, not an Error. Also, I doubt that " WARNING: No fixes with time integration, atoms won’t move" was triggered by the input you provided, since fix nve does take care of the time integration.

Finally, please be aware that there are rules on this forum, such as reporting your LAMMPS version.

Best,
Simon