initial velocity and fix momentum command


I have a quick question. I have read the manual about velocity command and fix momentum command.

Right now I am creating the initial velocity such as:

velocity all create 300 3183284 # Create random velocity distribution using random seed

Does this necessarily mean that the net momentum(linear and angular) of my system is 0? Or do I have to enforce fix momentum command to ensure that the net momentum(linear and angular) is 0?

In case you need more details, I am trying to calculate the thermal conductivity of c-Si and a-Si with S-W potential under periodic boundary conditions.



The velocity command has 2 optional keywords for linear and angular momentum.

See the doc page for what they do and what their default settings are.