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[求助]
NAMD跨膜環(huán)肽管求助,Periodic cell has become too small for original patch grid!
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各位前輩,小妹新手一枚,學習過程中問題多多。。。最近遇到一個棘手的問題,還請大家多多幫忙。我研究的體系是跨膜環(huán)肽納米管,由于要探索納米管在脂質(zhì)膜中的傾斜,所以在模擬的過程中對脂質(zhì)膜和環(huán)肽管沒有施加任何限制,然后進行超長時間的MD模擬。 由于計算條件限制,我是以20納秒為間隔,跑完一次再接著續(xù)跑20納秒。但是實際操作后發(fā)現(xiàn),首次二十納秒進行順利,在進行續(xù)跑,也就是21到40納秒的模擬時總是出現(xiàn)錯誤,錯誤提示是Periodic cell has become too small for original patch grid!。 我之前對照其他帖子給的方法進行修改,增加"margin 3",改大”langevinPistonPeriod 1000. langevinPistonDecay 500“但是最后還是不行。我在這里先貼出前二十納秒的CONF和續(xù)跑的CONF文件,希望各位前輩幫忙看看問題出在哪里,多謝。 |
金蟲 (正式寫手)

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structure 8pnt_mem_water.psf coordinates eq.pdb paraTypeCharmm on parameters par_all27_prot_lipid.inp parameters par_extraterms.inp set temperature 310 temperature $temperature if {0} { set inputname eq_r binCoordinates $inputname.restrart.coor binVelocities $inputname.vel ;# remove the "temperature" entry if you use this! #extendedSystem $inputname.xsc } firsttimestep 0 if {1} { cellBasisVector1 58. 0. 0. cellBasisVector2 0. 58. 0. cellBasisVector3 0. 0. 94. cellOrigin 0. 0. 0. } wrapAll on PME yes PMEGridSizeX 64 PMEGridSizeY 64 PMEGridSizeZ 100 exclude scaled1-4 cutoff 10. switching on switchdist 8. pairlistdist 12. timestep 1. nonbondedFreq 2 fullElectFrequency 4 stepspercycle 20 langevin on langevinDamping 5 langevinTemp $temperature langevinPiston on langevinPistonTarget 1. langevinPistonPeriod 1000. langevinPistonDecay 500. langevinPistonTemp $temperature useFlexibleCell yes useConstantRatio yes if {0} { constraints on consref constr.pdb conskfile constr.pdb conskcol B constraintscaling 10.0 } binaryoutput no outputName eq_1 dcdfreq 1000 xstFreq 1000 restartname eq_r_1 restartfreq 1000 binaryrestart yes outputEnergies 1000 outputtiming 1000 if {1} { minimize 10000 reinitvels $temperature } run 10000000 |
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接下來是續(xù)跑的CONF structure 8pnt_mem.psf coordinates eq.pdb paraTypeCharmm on parameters par_all27_prot_lipid.inp parameters par_extraterms.inp set temperature 310 if {1} { set inputname eq_r_1 binCoordinates $inputname.coor binVelocities $inputname.vel ;# remove the "temperature" entry if you use this! #extendedSystem $inputname.xsc } firsttimestep 25723000 if {0} { cellBasisVector1 58. 0. 0. cellBasisVector2 0. 58. 0. cellBasisVector3 0. 0. 94. cellOrigin 0. 0. 0. PME yes PMEGridSizeX 64 PMEGridSizeY 64 PMEGridSizeZ 100 } wrapAll on margin 5 exclude scaled1-4 cutoff 10. switching on switchdist 8. pairlistdist 12. timestep 1. nonbondedFreq 2 fullElectFrequency 4 stepspercycle 20 langevin on langevinDamping 5 langevinTemp $temperature langevinPiston on langevinPistonTarget 1. langevinPistonPeriod 1000. langevinPistonDecay 500. langevinPistonTemp $temperature useFlexibleCell yes useConstantRatio yes if {0} { constraints on consref constr.pdb conskfile constr.pdb conskcol B constraintscaling 10.0 } binaryrestart yes binaryoutput no outputName eq_1_xu dcdfreq 1000 xstFreq 1000 restartname eq_r_1_xu restartfreq 1000 outputEnergies 1000 outputtiming 1000 if {0} { minimize 2000 reinitvels $temperature } run 4307000 |
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