anirban polley wrote:

; OPTIONS FOR WEAK COUPLING ALGORITHMS =
; Temperature coupling   =
Tcoupl                   = berendsen
; Groups to couple separately =
tc-grps                  = DPP  SOL Na PIP
; Time constant (ps) and reference temperature (K) =
tau_t                    = 0.1   0.1   0.1   0.1
ref_t                    = 310   310   310   310

In addition to Marks' advice, don't couple solvent and ions separately. This is a common error. See here:

http://wiki.gromacs.org/index.php/Thermostats

-Justin

--
========================================

Justin A. Lemkul
Graduate Research Assistant
ICTAS Doctoral Scholar
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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