Cc:
Dear axel ,
Thanks for your replay.
I deleted that mass but nothing happend !
How do you mean “Nothing happened”? If you really deleted the “mass 3”-line you should get another error because now there is no mass specified for atom type 3.
Dear Stefan ,
I mean i could not run the code .
That’s right I got one another error.
So how can i fix this problem ? If i want to consider mass for M that is 0.0 i will have mass error and if i delete it I will get one another error !!
I think the real question is: What are you trying to achieve with a mass of 0? How can LAMMPS (or anything/anyone else) solve the equations of motion for a particle of zero mass? If you want a very light particle, you can put it to a very small number. Just make sure you change your time step as well to prevent bad dynamics.
Hi,
There is no need to define the particle that has zero mass in TIP4P. Its effect
is computed by pair lj/cut/tip4p/cut and lj/cut/tip4p/long without the need for
an explicit particle there.
Pierre