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tthappyy新蟲 (初入文壇)
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[求助]
LAMMPS中dpd模塊的參數(shù)如何設(shè)置,求大家給予幫助
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小弟剛剛學(xué)習(xí)DPD,使用LAMMPS中的DPD模塊功能進(jìn)行大分子自組裝模擬,在重復(fù)文獻(xiàn)中的模擬時(shí),不能將文獻(xiàn)中的參數(shù)完全對應(yīng)的放進(jìn)去,尤其是timestep,差了一個(gè)量級,文獻(xiàn)中是0.02,而我只能到0.002,稍微設(shè)置大一點(diǎn)兒就出現(xiàn)bond atoms missing 或者angle atom missing這樣的錯(cuò)誤。。。不知道有沒有人能幫忙改一改參數(shù)設(shè)置, 或者有什么指點(diǎn)的地方,感謝。文獻(xiàn)是這篇 Martin Bates and Martin Walker,Soft Matter, 2009, 5, 346–353, Dissipative particle dynamics simulation of T- and X-shaped polyphilic molecules exhibiting honeycomb columnar phases. boundary p p p units lj atom_style full bond_style harmonic angle_style harmonic variable T equal 0.7 pair_style dpd ${T} 1.0 34387 read_data resultTshape3.data mass * 1 bond_coeff 1 4.0 0. angle_coeff 1 4.0 180 angle_coeff 2 4.0 140 angle_coeff 3 1.0 180 angle_coeff 4 4.0 120 special_bonds lj 1.0 1.0 1.0 #default is 0 0 0. variable gamma equal 3.67^2/2./${T} pair_coeff * * 0 0 pair_coeff 6 6 5 ${gamma} #6:polar; 7:core1; 9:core2; 8:side chain. Sigma=sqrt(2*T*gamma)=3.67(given in the paper) pair_coeff 6 7 15 ${gamma} #pair_coeff specifies A and gamma, do not support mixing pair_coeff 6 8 40 ${gamma} #coefficients for all I,J pairs must be specified explicitly. pair_coeff 6 9 10 ${gamma} #LAMMPS sets ij and ji to be the same values. pair_coeff 7 7 15 ${gamma} #pair_coeff command can override a previous setting. pair_coeff 7 8 40 ${gamma} pair_coeff 7 9 15 ${gamma} pair_coeff 8 8 20 ${gamma} pair_coeff 8 9 40 ${gamma} pair_coeff 9 9 10 ${gamma} communicate multi vel yes #velocites are stored by ghost atoms for dpd style. velocity all create ${T} 49863 dist uniform neighbor 2.0 bin neigh_modify delay 0 every 1 timestep 0.001 # timestep 0.02, 1M steps was found to be sufficient for N=5000 system thermo 100000 thermo_style one restart 100000 restart dump d1 all xyz 1000000 dump.fluid.*.xyz dump_modify d1 flush yes fix 1 all nvt temp 0.7 1.7 1.0 run 5000000 unfix 1 fix 1 all nvt temp 1.7 1.7 1.0 run 50000000 |
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