thermal impulse command

Hello lammps users
Can some one please suggest me an appropriate command to impose an ultrafast thermal impulse on a layered material which will cause a rise in temperature.
thanks in anticipation.

Jakes

Hello lammps users
Can some one please suggest me an appropriate command to impose an
ultrafast thermal impulse on a layered material which will cause a rise in
temperature.

http://lammps.sandia.gov/doc/velocity.html

it's even ​faster than ultrafast.​ it's instantaneous.

axel.

Of fix heat if you want to be a bit more gradual :slight_smile:

Steve

Thank you for your response.
I am using unit metal

I intent to pump a heat impulse of 0.00468 W on a layer of atoms for just 0.05 ps and observe their excitations. my time step is 0.0005 ps.
now converting to eV/ps I got 2921.0249779 eV/psec. below is a portion of my script

#excitations
fix 3 Phos heat 100 2921.024
variable Temperature equal temp
variable tEnrgy equal etotal
#fix 4 all ave/time 100 10 1000 v_Temperature v_tEnrgy file file1.dat

thermo 100
thermo_style custom step temp time etotal v_Temperature

unfix 3

and I seems not to get it right. please I will appreciate your comments.

thanks in anticipation

Of fix heat if you want to be a bit more gradual :slight_smile:

Steve