damp parameter in”fix langevin command”

Dear all,

First thank you for good suggestions, I have solved the warning “Particle deposition was unsuccessful”.

I have been confused about the damp parameter in”fix langevin command”, when I used smaller damp parameter, atoms on surface form cluster, when I use lager damp parameter, atoms on surface did not form cluster. I wonder how to understand this? The diffusion of atoms on surface is determined by the interaction between surface and atoms. Now the results show that different damp parameter can affect the behavior of the atom cluster, How to connect the dump parameter with the physical properties? I see in manual, it may correspond to viscosity, but to specific material under same temperature, does the viscosity is a constant? Why it can be altered by dump parameter? To the growth issue, how to understand the physical meaning of the influence of damp parameter on the state of atoms on surface?

Best wishes,

Xiaojing

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