[lammps-users] temperature compute lammps

I have also simulated the same system with temp/partial and fix_modify but this time I used black phosphorene instead of graphene and in this simulation the total temperature of the system converged to 300K and it was not very large this time.
i want to know why in graphene channel temperature was so high but in phosphorene channel it was ok. is it because of the roughness of phosphorene?
i have to mention that the velocity in the graphene channel was x100 higher than phosphorene.

That is a topic for a discussion with your adviser / supervisor / colleagues that are familiar with your research. This is definitely not a LAMMPS issue. LAMMPS will run the model you input. Whether this produces the expected result or what to expect is not something that LAMMPS has an influence on.