112 lines
3.2 KiB
Plaintext
112 lines
3.2 KiB
Plaintext
# SPH water over dam
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atom_style sph
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dimension 2
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newton on
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boundary s s p
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units lj
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read_data data.sph
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# upper limit of timestep based on CFL-like criterion
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# roughly estimate number of timesteps needed for 7.5 seconds
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variable h equal 0.03
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variable c equal 10.0 # soundspeed for Tait's EOS
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variable dt equal 0.1*${h}/${c}
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variable nrun equal 15.0/${dt}
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# assign group name "bc" to boundary particles (type 2)
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# assign group name "water" to water particles (type 1)
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group bc type 2
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group water type 1
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# use hybrid pairstyle which does density summation
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# with cutoff ${h} every timestep (1)
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# use target density of 1000, soundspeed ${c} for Tait's EOS
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pair_style hybrid/overlay sph/rhosum 1 sph/taitwater
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pair_coeff * * sph/taitwater 1000.0 ${c} 1.0 ${h}
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pair_coeff 1 1 sph/rhosum ${h}
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# add gravity. This fix also computes potential energy of mass in gravity field
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fix gfix water gravity -9.81 vector 0 1 0
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fix 2d_fix all enforce2d
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compute rho_peratom all sph/rho/atom
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compute e_peratom all sph/e/atom
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compute esph all reduce sum c_e_peratom
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compute ke all ke
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variable etot equal c_esph+c_ke+f_gfix
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compute ke_peratom all ke/atom
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# adjust nevery | min. allowed dt | max. allowed dt |
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# max. travel distance per dt
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# ${dt} ~= CFL criterion 0.1*h/c
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# remove top atoms
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region cut block INF INF 2.5 INF INF INF
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delete_atoms region cut
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# use a variable timestep
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fix dtfix all dt/reset 1 NULL ${dt} 0.0005 units box
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# time-integrate position, velocities,
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# internal energy and density of water particles
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fix integrate_water_fix water sph
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# time-integrate only internal energy and density of boundary particles
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fix integrate_bc_fix bc sph/stationary
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thermo 500
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thermo_style custom step ke c_esph v_etot f_gfix press time f_dtfix
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thermo_modify norm no
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# load balancing
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comm_style tiled
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fix 100 all balance 100 0.9 rcb
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# fix ave/grid
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fix ave all ave/grid 50 5 250 10 10 1 vx vy
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# dump particles
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#dump dump_id all custom 100 tmp.dump &
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# id type x y z c_ke_peratom
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#dump_modify dump_id first yes
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# dump grid
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#compute ave all property/grid 10 10 1 id ix iy
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#dump ave all grid 250 tmp.grid c_ave:grid:data[*] f_ave:grid:data[*]
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#dump_modify ave sort 1
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# dump image
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#compute 1 all property/atom proc
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#variable p atom c_1%10
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#dump 3 all image 500 tmp.*.png c_ke_peratom type &
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# adiam 0.015 view 0 0 zoom 2.5 subbox yes 0.01 &
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# center d 0.5 0.5 0.5 size 1024 768 box no 0.0 &
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# grid f_ave:grid:count
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#variable colors string &
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# "min blue 0.25 green 0.5 orange 0.75 yellow max red"
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#dump_modify 3 pad 5 amap 0 1.5 cf 1 5 ${colors}
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# run
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neigh_modify every 5 delay 0 check no
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variable skin equal 0.3*${h}
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neighbor ${skin} bin
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run 6000
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