[gmx-users] BD and SD equations

[Marcelo A. Carignano]

Hi all,

Stochastic dynamics is described in section 3.8 of the Manual (v. 4.5)
Equation 3.108 is dimensionally incorrect, or at least I cannot  
understand it.
Left hand side is a force, and the first term on the right hand side  
has a missing length in the numerator to be a force.
This is according to the definition of xi, right below the equation,  
as having units of 1/ps.

Brownian dynamics, described in section 3.9, also has a problem  
(again, in my opinion)
gamma is defined as mass/xi, but it is using gamma=mass*xi that we can  
recover the two terms of the SD case
(still with the wrong dimensions)

Could anyone clarify this to me? Many thanks

M. Carignano