Dear Lammps user,

Right now I calculate a rectangular block system (a,b,c are all

different. alpha=beta=gamma=90).

I calcualte the elastic constants.

But the results are different with the number of calculation processors.

Here is the results of 1 processor

Elastic Constant C11all = 142.8442601 GPa

Elastic Constant C22all = 414.0452621 GPa

Elastic Constant C33all = 203.0386778 GPa

Elastic Constant C12all = 84.49933935 GPa

Elastic Constant C13all = 70.07458349 GPa

Elastic Constant C23all = 89.61608803 GPa

Elastic Constant C44all = 33.86150426 GPa

Elastic Constant C55all = 30.25907884 GPa

Elastic Constant C66all = 15.18591479 GPa

This is for 2 processors.

Elastic Constant C11all = 134.9056529 GPa

Elastic Constant C22all = 199.3279293 GPa

Elastic Constant C33all = 218.0071914 GPa

Elastic Constant C12all = -75.36347145 GPa

Elastic Constant C13all = 83.67093754 GPa

Elastic Constant C23all = 73.48298501 GPa

Elastic Constant C44all = 21.38525366 GPa

Elastic Constant C55all = 47.8379712 GPa

Elastic Constant C66all = 25.08291871 GPa

And this is for 4 processors.

Elastic Constant C11all = 178.620808 GPa

Elastic Constant C22all = 234.3595784 GPa

Elastic Constant C33all = 273.8363956 GPa

Elastic Constant C12all = 18.15445801 GPa

Elastic Constant C13all = 62.14474542 GPa

Elastic Constant C23all = 90.36618796 GPa

Elastic Constant C44all = 51.37238981 GPa

Elastic Constant C55all = 37.15761233 GPa

Elastic Constant C66all = 21.42501557 GPa

So what should i do next

thanks you.

by the way, lattice constants are never changed.