Re: [Pw_forum] Convergence test on big model

2016-02-18 Thread Ari P Seitsonen
Dear Yangchuan Li, In principle the values of cut-off are fully transferable, for the same kind of pseudo potential: As the highest Fourier components are required due to more localised (ie fastly varying) electronic wave functions close to the nuclei and there the changes going from one ch

[Pw_forum] Convergence test on big model

2016-02-18 Thread Yangchuan Li
Hi everyone, I want to ask whether a converged Ecut and smearing width can be used in another model. I have a big model (functionalized carbon nanotube) and it's time-consuming to do scf calculation. I notice Stefano mentioned that Ecut is not strongly depended on particular configuration. (In top

Re: [Pw_forum] Geometry_Optimization

2016-02-18 Thread Giovanni Cantele
Dear Amir, it should be an error associated to symmetries, even though I cannot figure out where it comes from! However, if you want just to have the job running, adding nosym=.true. to the SYSTEM name list fixes the problem, because in that case symmetries are not used and so this strange symm