brownian motion

hello dear users
i am simulating the cubic with nanofluids including water and cu…cu is a sphere region (bottom image) that is build by entering code in lammps(bottom code).it is fix until the end of run but i want it to have a brownian motion and moves away,does anybody know how can cu atoms have brownian motion?i mean entering code in lammps…
i have found this command .is it true and how should i edit it?it works but cu sphere does’nt move.i want it to move to the sides.
fix cu all spring tether 500 30 30 15 35

i appreciate any helps
thank you very much

lattice fcc 3.615 #Cu lattice constant
region Cu sphere 30 30 15 9 units box #x=30 ,y=30,z=15 ,r=9
create_atoms 3 region Cu
pair_coeff 1 3 lj/cut 1.2105 1.5925 #H-Cu epsilon sigma
pair_coeff 2 3 lj/cut 0 .0095# 1.0385 #O-Cu epsilon
pair_coeff 3 3 eam cu.eam
pair_coeff 1 4 lj/cut 1.2105 1.5925 #H-Cu epsilon sigma
pair_coeff 2 4 lj/cut 0 .0095# 1.0385
pair_coeff 4 4 eam cu.eam

fix cu all spring tether 500 30 30 15 35

email.wmv (462 KB)

can't you take a hint? haven't you noticed anything?? nobody *cares*! go away!!

do something meaningful with your life. forget about running MD and
using LAMMPS.
at the current rate, you will *never* be able to produce anything even
remotely meaningful with LAMMPS for your entire lifetime.

you have demonstrated time and again for about a year or so, that you
are unable to follow advice being given, and that you are lacking
understanding of MD and statistical mechanics at the most fundamental
level. that you persistently refuse to make even the slightest effort
to correct that and continue running simulations that are obviously
severely flawed, disqualifies you from deserving any kind of help from
this list.

no sane person cares to help a moron.

you don't have to be much of an expert to recognize from the provided
pictures and movies that your simulations are *garbage* considering
the obviously unphysical behavior of your water molecules. in
addition, your inquiry and your suggestion for addressing the
perceived problems confirms that you don't have the faintest clue of
what you are doing, and are incapable of making sense of any kind of
documentation. thus even the most well intended advice would be wasted
on you.

as you have been told before, your posts to this list are - at best -
a joke. everybody that had answered at some point in time has by now
given up.

so if you have any kind of clue left in you, and now that i have
spelled it out again, take the hint, do something smart for a change,
and forget about LAMMPS, go away and do something else.

that is the best kind of help anybody can give you at the current
state of affairs and if you appreciate "any help" as much as you
consistently claim, you will follow the advice.



That was a completely unprofessional response, even for you.

I am amazed the LAMMPS team tolerates that kind of behavior. It's too bad
the can't (or won't) hold you accountable. If you want to respond in such a
hatefilled, vicious fashion, you should at least do it one-on-one and not in
a public forum.

Jim Kress

ok - everyone please take a step back and a few deep breaths.

Mehdi - I apologize you were blasted in a public forum. The tone was

unkind and over-the-top. You do need to learn MD on your own
(you can’t learn it from a mail list),

and if you post, ask more LAMMPS-specific Qs.
With the kinds of Qs you’ve been posting, you won’t get

many productive answers.

Axel - When your patience expires, please just hit delete on a message

and let it go. Or if you must, send something private. That’s my

advice for everyone who answers Qs on the list, including myself.

Having sent a few private emails I later wish I hadn’t, I don’t

even advise that course of action!

Everyone else - No one should feel that they can’t ask a simple

or possibly stupid question on the mail list. However, you may get
blunt answers or no answers or wrong answers, for any Q you ask.
Try not to take it personally. That’s life on a busy mail list.