Linesearch alpha is zero : during minimisation process

Dear all ,
I am trying to prepare LJ glass sample to apply athermal quasistatic shear deformation. I am creating 10000 particles in a 2D simulation box with density 0.976. While doing so the particles are getting highly overlapped. To start with, I am trying to run a minimisation process on the particles. While doing so the simulation is ending with the message :linesearch alpha is zero, instead of stopping with the force tolerance criteria. I am using ** stable 2 august 2023 ** version of lammps. Can anyone help me in understanding the cause and resolving this issue.

units           lj   # lj or real or metal or si or cgs or electron or micro or nano (unitless
atom_style      sphere
boundary p p p
dimension       2

region      box prism 0.0 101.0 0.0 101.0 -0.5 0.5 0.0 0.0 0.0

create_box      2 box
create_atoms 1 random 5000 3000 NULL overlap 0.7  units box
create_atoms 2 random 5000 4000 NULL overlap 0.5 units box

set type 1 mass 1.0
set type 2 mass 1.0
set type 1 diameter 1.175
set type 2 diameter 0.618

comm_modify vel yes
neighbor  0.55 bin
pair_style lj/cut 2.5
pair_coeff 1 1 0.5 1.175
pair_coeff 2 2 0.5 0.618
pair_coeff 1 2 1.0 1.0

neigh_modify every 1 delay 0 check yes
fix 100 all enforce2d
thermo 100
min_style cg
thermo_style custom step temp ke pe
dump    mydumpp all atom 10 initial.dump
dump             2 all custom 1000 *.data id type diameter mass x y z vx vy fx fy
restart 100 restart.*.glass_initial
minimize 0.0 1.0e-05 100000 10000000

this is the message I am getting after the minimisation run

Minimization stats:
  Stopping criterion = linesearch alpha is zero
  Energy initial, next-to-last, final = 
      885.381815945713  -2.39113003575981   -2.3911300357598
  Force two-norm initial, final = 7952605.6 8.3403101
  Force max component initial, final = 442284.36 2.6306243
  Final line search alpha, max atom move = 8.0470533e-07 2.1168774e-06
  Iterations, force evaluations = 1041 2020

Any suggestion is appreciated

Hi @Divas,

You already asked the same question and got an answer [last month}(Linesearch alpha is zero - During energy minimization). What is the difference in your question apart from your system and lammps version?

Also there are some discussions in the archives about this very same issue.

1 Like

@Divas please just reply to comments on your posts instead of flagging them for moderation. We prefer to keep discussions public. Flagging should be reserved for problematic posts that are abusive or otherwise inappropriate.

Dear sir
Sorry for my actions
As mentioned by a LAMMPS community member that I have asked a similar kind of question before too , I thought it will be better to remove this post .
But from now , I will comment on my posts instead of flagging them.