forked from lijiext/lammps
61 lines
2.0 KiB
Plaintext
61 lines
2.0 KiB
Plaintext
"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
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:link(lws,http://lammps.sandia.gov)
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:link(ld,Manual.html)
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:link(lc,Section_commands.html#comm)
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:line
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fix smd/integrate_ulsph command :h3
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[Syntax:]
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fix ID group-ID smd/integrate_ulsph keyword :pre
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ID, group-ID are documented in "fix"_fix.html command
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smd/integrate_ulsph = style name of this fix command
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zero or more keyword/value pairs may be appended :ul
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keyword = adjust_radius or limit_velocity
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adjust_radius values = adjust_radius_factor min_nn max_nn
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adjust_radius_factor = factor which scale the smooth/kernel radius
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min_nn = minimum number of neighbors
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max_nn = maximum number of neighbors
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limit_velocity values = max_velocity
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max_velocity = maximum allowed velocity.
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[Examples:]
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fix 1 all smd/integrate_ulsph adjust_radius 1.02 25 50 :pre
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fix 1 all smd/integrate_ulsph limit_velocity 1000 :pre
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[Description:]
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The fix performs explicit time integration for particles which interact with the updated Lagrangian SPH pair style.
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See "this PDF guide"_USER/smd/SMD_LAMMPS_userguide.pdf to using Smooth Mach Dynamics in LAMMPS.
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The {adjust_radius} keyword activates dynamic adjustment of the per-particle SPH smoothing kernel radius such that the number of neighbors per particles remains
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within the interval {min_nn} to {max_nn}. The parameter {adjust_radius_factor} determines the amount of adjustment per timestep. Typical values are
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{adjust_radius_factor}=1.02, {min_nn}=15, and {max_nn}=20.
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The {limit_velocity} keyword will control the velocity, scaling the norm of
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the velocity vector to max_vel in case it exceeds this velocity limit.
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[Restart, fix_modify, output, run start/stop, minimize info:]
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Currently, no part of USER-SMD supports restarting nor minimization. This fix has no outputs.
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[Restrictions:]
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This fix is part of the USER-SMD package. It is only enabled if
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LAMMPS was built with that package. See the "Making LAMMPS"_Section_start.html#start_3
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section for more info.
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[Related commands:]
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[Default:] none
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