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[ÇóÖú] LAMMPSÖÐdpdÄ£¿éµÄ²ÎÊýÈçºÎÉèÖã¬Çó´ó¼Ò¸øÓè°ïÖú

СµÜ¸Õ¸ÕѧϰDPD£¬Ê¹ÓÃLAMMPSÖеÄDPDÄ£¿é¹¦ÄܽøÐдó·Ö×Ó×Ô×é×°Ä£Ä⣬ÔÚÖØ¸´ÎÄÏ×ÖеÄÄ£Äâʱ£¬²»Äܽ«ÎÄÏ×ÖеIJÎÊýÍêÈ«¶ÔÓ¦µÄ·Å½øÈ¥£¬ÓÈÆäÊÇtimestep£¬²îÁËÒ»¸öÁ¿¼¶£¬ÎÄÏ×ÖÐÊÇ0.02,¶øÎÒÖ»Äܵ½0.002£¬ÉÔ΢ÉèÖôóÒ»µã¶ù¾Í³öÏÖbond atoms missing »òÕßangle atom missingÕâÑùµÄ´íÎ󡣡£¡£²»ÖªµÀÓÐûÓÐÈËÄܰïæ¸ÄÒ»¸Ä²ÎÊýÉèÖÃ, »òÕßÓÐʲôָµãµÄµØ·½£¬¸Ðл¡£ÎÄÏ×ÊÇÕâÆª Martin Bates and Martin Walker,Soft Matter, 2009, 5, 346¨C353, 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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  • ¸½¼þ 1 : Computer_Simulation-4.pdf
  • 2014-06-09 15:00:16, 1.77 M

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