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水儿CoCo木虫 (小有名气)
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[求助]
OPLSAA力场MD模拟时mdp文件
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我采用以上力场进行模拟，但是运行到MD最后一步时终止了，而且还出现了Fatal error: Too many LINCS warnings (1000) 我看网上说是md.mdp参数设置不对，以下是我的文件，希望大神帮我看看哪里要改的，应该是该cut-off参数，但是我不知道这个对不对，谢谢大家啦  title = OPLS MD ; Run parameters integrator = md ; leap-frog integrator nsteps = 5000000 ; 2 * 5000000 = 10000 ps, 10 ns dt = 0.002 ; 2 fs ; Output control nstxout = 1000 ; save coordinates every 2 ps nstvout = 1000 ; save velocities every 2 ps nstxtcout = 1000 ; xtc compressed trajectory output every 2 ps nstenergy = 1000 ; save energies every 2 ps nstlog = 1000 ; update log file every 2 ps energygrps = Protein LC3 ; Bond parameters continuation = yes ; Restarting after NPT constraint_algorithm = lincs ; holonomic constraints constraints = all-bonds ; all bonds (even heavy atom-H bonds) constrained lincs_iter = 1 ; accuracy of LINCS lincs_order = 4 ; also related to accuracy ; Neighborsearching ns_type = grid ; search neighboring grid cells nstlist = 5 ; 10 fs rlist = 1.0 ; short-range neighborlist cutoff (in nm) rcoulomb = 1.0 ; short-range electrostatic cutoff (in nm) rvdw = 1.0 ; short-range van der Waals cutoff (in nm) ; Electrostatics coulombtype = PME ; Particle Mesh Ewald for long-range electrostatics pme_order = 4 ; cubic interpolation fourierspacing = 0.16 ; grid spacing for FFT ; Temperature coupling is on tcoupl = V-rescale ; modified Berendsen thermostat tc-grps = Protein_LC3 Water_and_ions ; two coupling groups - more accurate tau_t = 0.1 0.1 ; time constant, in ps ref_t = 310 310 ; reference temperature, one for each group, in K ; Pressure coupling is on pcoupl = Parrinello-Rahman ; Pressure coupling on in NPT pcoupltype = isotropic ; uniform scaling of box vectors tau_p = 2.0 ; time constant, in ps ref_p = 1.0 ; reference pressure, in bar compressibility = 4.5e-5 ; isothermal compressibility of water, bar^-1 ; Periodic boundary conditions pbc = xyz ; 3-D PBC ; Dispersion correction DispCorr = EnerPres ; account for cut-off vdW scheme ; Velocity generation gen_vel = no ; Velocity generation is off |
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