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´ð£ºRestarting a DPD run
At the end of a DPD run and at specified intervals during the run, DPD saves a restart data file, .Dpd_rst. This
file is downloaded at the end of the run and contains the positions and velocities of all the beads. It enables you
to restart the simulation from part way through or at the end of the previous DPD run.
To restart a simulation
1. Select the mesoscale trajectory document from the run you wish to restart.
2. Choose Modules | DPD | Calculation from the menu bar.
3. Load the parameters from the run you wish to restart, by double-clicking on the associated Settings file
in the Project Explorer.
4. Check Restart.
5. On the Setup tab, choose whether to Reinitialize averages.
6. Change the length of the run.
Note. The time step counter is not reset between simulations. Therefore, the restarted DPD simulation will run for
the Number of steps specified on the Setup tab less the number of steps already completed.
7. If desired, specify new output options, simulation conditions and interaction parameters.
8. Press Run.
Note. The Restart checkbox is enabled only if a restart file is present. However, this file cannot be seen in the
Project Explorer window. You can use the Windows Explorer to verify that the file exists.
Note. When you restart a simulation you can modify some parameters such as the length of the run, output period
options, simulation conditions, interaction parameters, etc. However, others, such as simulation cell size, grid
spacing, cell contents, etc., must remain the same as they were before the restart. These options are disabled when
Restart is checked.
¹´Ñ¡ restart
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´ð£ºMultiplicityÉèÖÃΪAutoÊÇϵͳ×Ô¶¯Ñ°ÕÒÄÜÁ¿×îµÍ¡¢×îÎȶ¨µÄ×ÔÐý¶àÖØ¶È
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1 ¼ÆËã±íÃæ¹ý³ÌÖУ¬¼ÆËã³É¹¦£¬µ«ÊÇcastep½á¹ûÖÐÌáʾ
------------------------------------------------------------------------ <-- SCF
SCF loop Energy Fermi Energy gain Timer <-- SCF
energy per atom (sec) <-- SCF
------------------------------------------------------------------------ <-- SCF
Initial -1.24983546E+004 5.76278315E+001 55.44 <-- SCF
1 -1.59703259E+004 -1.69750335E+000 2.89330938E+002 197.97 <-- SCF
Warning: There are no empty bands for at least one kpoint and spin; this may slow the convergence and/or lead to an
inaccurate groundstate. If this warning persists, you should consider increasing nextra_bands and/or reducing
smearing_width in the param file. Recommend using nextra_bands of 11 to 24.
2 -1.62762609E+004 -6.23532889E+000 2.54945870E+001 356.62 <-- SCF
Warning: There are no empty bands for at least one kpoint and spin; this may slow the convergence and/or lead to an
inaccurate groundstate. If this warning persists, you should consider increasing nextra_bands and/or reducing
smearing_width in the param file.Recommend using nextra_bands of 11 to 24.
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3 ½øÐмÆËãʱѡÔñÉÏ"spin polarized", ¶ÔÓÚ²»Í¬ÔªËØ£¬Æä²ÎÊýÈçºÎÉèÖã¿"initial pin"ºÍ"charge"¡£
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NEXTRA_BANDS
This keywords controls the number of extra bands in addition to the number of occupied bands. These extra bands are
necessary for metals or finite temperature insulators. The default value for this parameter is 0.
SMEARING_WIDTH
This keyword determines the width of the Fermi-surface smearing if the system is being treated as a metal.
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There are two ways of defining the initial magnetic configuration: either specify the total magnetic moment per unit
cell, which gets uniformly distributed over the space, or provide detailed information on the absolute values and
direction (up or down) of the spins for each atom in the unit cell. The former method can be used for relatively
simple systems where only two solutions are expected (magnetic and non-magnetic). The latter method, which specifies
the spin state of the atoms in the system, is more general and gives much more flexibility. It is possible to set up
ferromagnetic, ferrimagnetic, or antiferromagnetic calculations to get different starting spin arrangements.
²»¹ýÎҼǵúÃÏñËûÃǹ«Ë¾Ëµ¹ý£¬Ò»°ãformal spin¶¼¿ÉÒÔ£¬³ý·ÇÊǼÆËãһЩ´ÅÐÔÎïÖÊ£¬±ÈÈçFe¡¢CoÕâÖÖ¡£Ä¿Ç°ÎÒ¶¼ÊÇĬÈÏ¡£ÖÁÓÚ
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The initial value of the spin moment is quite important for spin-polarized calculations. It should be as close as
possible to the expected value. You can evaluate the spin moment using the high-spin approximation combined with
formal charges. For example, if there are ten Fe3+ ions in the system, you assume that each of them has a valence
electronic configuration of d5 (the neutral configuration is s2d6) which corresponds to five unpaired electrons per
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