forked from lijiext/lammps
72 lines
2.7 KiB
Plaintext
72 lines
2.7 KiB
Plaintext
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"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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pair_style smd/ulsph command :h3
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[Syntax:]
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pair_style smd/ulsph args :pre
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these keywords must be given :l
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keyword = {*DENSITY_SUMMATION} or {*DENSITY_CONTINUITY} and {*VELOCITY_GRADIENT} or {*NO_VELOCITY_GRADIENT} and {*GRADIENT_CORRECTION} or {*NO_GRADIENT_CORRECTION}
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[Examples:]
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pair_style smd/ulsph *DENSITY_CONTINUITY *VELOCITY_GRADIENT *NO_GRADIENT_CORRECTION
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[Description:]
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The {smd/ulsph} style computes particle interactions according to continuum mechanics constitutive laws and an updated Lagrangian Smooth-Particle Hydrodynamics algorithm.
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This pair style is invoked similar to the following command:
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pair_style smd/ulsph *DENSITY_CONTINUITY *VELOCITY_GRADIENT *NO_GRADIENT_CORRECTION
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pair_coeff i j *COMMON rho0 c0 Q1 Cp hg &
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*END :pre
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Here, {i} and {j} denote the {LAMMPS} particle types for which this pair style is
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defined. Note that {i} and {j} can be different, i.e., {ulsph} cross interactions
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between different particle types are allowed. However, {i}--{i} respectively {j}--{j} pair_coeff lines have to preceed a cross interaction.
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In contrast to the usual {LAMMPS} {pair coeff} definitions, which are given solely a
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number of floats and integers, the {ulsph} {pair coeff} definition is organised using
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keywords. These keywords mark the beginning of different sets of parameters for particle properties,
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material constitutive models, and damage models. The {pair coeff} line must be terminated with
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the {*END} keyword. The use the line continuation operator {&} is recommended. A typical
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invocation of the {ulsph} for a solid body would consist of an equation of state for computing
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the pressure (the diagonal components of the stress tensor), and a material model to compute shear
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stresses (the off-diagonal components of the stress tensor).
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Note that the use of *GRADIENT_CORRECTION can lead to severe numerical instabilities. For a general fluid simulation, *NO_GRADIENT_CORRECTION is recommended.
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Please see the "SMD user guide"_USER/smd/SMD_LAMMPS_userguide.pdf for a complete listing of the possible keywords and material models.
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:line
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[Mixing, shift, table, tail correction, restart, rRESPA info]:
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No mixing is performed automatically.
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Currently, no part of USER-SMD supports restarting nor minimization.
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rRESPA does not apply to this pair style.
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:line
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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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"pair_coeff"_pair_coeff.html
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[Default:] none
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:line
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