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tsimulation.jl - seaice-experiments - sea ice experiments using Granular.jl |
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git clone git://src.adamsgaard.dk/seaice-experiments |
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tsimulation.jl (14531B) |
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--- |
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1 #!/usr/bin/env julia |
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2 import Granular |
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3 import ArgParse |
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4 |
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5 verbose = false |
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6 |
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7 function parse_command_line() |
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8 s = ArgParse.ArgParseSettings() |
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9 ArgParse.@add_arg_table s begin |
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10 "--width" |
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11 help = "strait width [m]" |
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12 arg_type = Float64 |
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13 default = 6e3 |
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14 "--E" |
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15 help = "Young's modulus [Pa]" |
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16 arg_type = Float64 |
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17 default = 2e7 |
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18 "--nu" |
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19 help = "Poisson's ratio [-]" |
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20 arg_type = Float64 |
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21 default = 0.285 |
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22 "--k_n" |
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23 help = "normal stiffness [N/m]" |
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24 arg_type = Float64 |
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25 default = 1e7 |
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26 "--k_t" |
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27 help = "tangential stiffness [N/m]" |
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28 arg_type = Float64 |
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29 default = 1e7 |
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30 "--gamma_n" |
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31 help = "normal viscosity [N/(m/s)]" |
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32 arg_type = Float64 |
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33 default = 0. |
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34 "--gamma_t" |
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35 help = "tangential viscosity [N/(m/s)]" |
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36 arg_type = Float64 |
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37 default = 0. |
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38 "--mu_s" |
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39 help = "static friction coefficient [-]" |
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40 arg_type = Float64 |
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41 default = 0.3 |
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42 "--mu_d" |
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43 help = "dynamic friction coefficient [-]" |
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44 arg_type = Float64 |
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45 default = 0.3 |
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46 "--mu_s_wall" |
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47 help = "static friction coefficient for wall particles [-]" |
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48 arg_type = Float64 |
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49 default = 0.3 |
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50 "--mu_d_wall" |
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51 help = "dynamic friction coefficient for wall particles [-]" |
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52 arg_type = Float64 |
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53 default = 0.3 |
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54 "--tensile_strength" |
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55 help = "the maximum tensile strength [Pa]" |
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56 arg_type = Float64 |
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57 default = 0. |
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58 "--r_min" |
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59 help = "minimum grain radius [m]" |
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60 arg_type = Float64 |
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61 default = 6e2 |
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62 "--r_max" |
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63 help = "maximum grain radius [m]" |
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64 arg_type = Float64 |
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65 default = 1.35e3 |
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66 "--thickness" |
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67 help = "grain thickness [m]" |
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68 arg_type = Float64 |
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69 default = 1. |
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70 "--rotating" |
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71 help = "allow the grains to rotate" |
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72 arg_type = Bool |
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73 default = true |
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74 "--ocean_vel_fac" |
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75 help = "ocean velocity factor [-]" |
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76 arg_type = Float64 |
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77 default = 0.0 |
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78 "--atmosphere_vel_fac" |
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79 help = "atmosphere velocity [m/s]" |
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80 arg_type = Float64 |
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81 default = 30.0 |
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82 "--total_hours" |
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83 help = "hours of simulation time [h]" |
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84 arg_type = Float64 |
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85 default = 12. |
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86 "--seed" |
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87 help = "seed for the pseudo RNG" |
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88 arg_type = Int |
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89 default = 1 |
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90 "id" |
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91 help = "simulation id" |
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92 required = true |
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93 end |
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94 return ArgParse.parse_args(s) |
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95 end |
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96 |
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97 function report_args(parsed_args) |
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98 println("Parsed args:") |
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99 for (arg,val) in parsed_args |
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100 println(" $arg => $val") |
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101 end |
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102 end |
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103 |
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104 function run_simulation(id::String, |
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105 width::Float64, |
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106 E::Float64, |
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107 nu::Float64, |
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108 k_n::Float64, |
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109 k_t::Float64, |
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110 gamma_n::Float64, |
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111 gamma_t::Float64, |
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112 mu_s::Float64, |
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113 mu_d::Float64, |
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114 mu_s_wall::Float64, |
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115 mu_d_wall::Float64, |
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116 tensile_strength::Float64, |
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117 r_min::Float64, |
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118 r_max::Float64, |
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119 thickness::Float64, |
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120 rotating::Bool, |
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121 ocean_vel_fac::Float64, |
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122 atmosphere_vel_fac::Float64, |
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123 total_hours::Float64, |
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124 seed::Int) |
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125 |
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126 info("## EXPERIMENT: " * id * " ##") |
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127 sim = Granular.createSimulation(id=id) |
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128 |
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129 const Lx = 50.e3 |
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130 const Lx_constriction = width |
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131 const Ly_constriction = 10e3 |
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132 const L = [Lx, Lx*3./4., 1e3] |
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133 const dx = r_max*2. |
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134 |
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135 #n = [Int(ceil(L[1]/dx/2.)), Int(ceil(L[2]/dx/2.)), 2] |
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136 n = [Int(ceil(L[1]/dx)), Int(ceil(L[2]/dx)), 2] |
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137 |
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138 # Initialize confining walls, which are grains that are fixed in spa… |
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139 r = r_max |
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140 h = thickness |
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141 r_walls = r_min/2. |
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142 |
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143 ## N-S segments |
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144 for y in linspace(r_walls, |
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145 Ly_constriction - 2.0*r_walls, |
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146 Int(ceil((Ly_constriction - 2.*r_walls)/(r_walls*2… |
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147 |
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148 Granular.addGrainCylindrical!(sim, |
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149 [Lx/2. - Lx_constriction/2. - r_wa… |
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150 r_walls, h, fixed=true, verbose=fa… |
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151 |
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152 Granular.addGrainCylindrical!(sim, |
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153 [Lx/2. + Lx_constriction/2. + r_wa… |
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154 r_walls, h, fixed=true, verbose=fa… |
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155 |
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156 end |
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157 |
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158 dx = 2.*r_walls |
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159 |
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160 ## Left island upper edge |
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161 x = r_walls:dx:(Lx/2. - Lx_constriction/2. - r_walls) |
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162 y = ones(length(x))*Ly_constriction |
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163 for i in 1:length(x) |
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164 Granular.addGrainCylindrical!(sim, [x[i], y[i]], r_walls, h, fix… |
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165 verbose=false) |
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166 end |
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167 |
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168 ## Right island upper edge |
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169 x = (Lx/2. + Lx_constriction/2. + r_walls):dx:(Lx - r_walls) |
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170 y = ones(length(x))*Ly_constriction |
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171 for i in 1:length(x) |
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172 Granular.addGrainCylindrical!(sim, [x[i], y[i]], r_walls, h, fix… |
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173 verbose=false) |
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174 end |
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175 |
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176 n_walls = length(sim.grains) |
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177 info("added $(n_walls) fixed grains as walls") |
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178 |
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179 # Initialize ocean and atmosphere |
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180 sim.ocean = Granular.createRegularOceanGrid(n, L, name="no_flow") |
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181 sim.atmosphere = Granular.createRegularAtmosphereGrid(n, L, |
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182 name="uniform_… |
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183 sim.atmosphere.v[:, :, 1, 1] = -atmosphere_vel_fac |
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184 |
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185 Granular.setGridBoundaryConditions!(sim.ocean, "inactive", "-y +y") |
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186 Granular.setGridBoundaryConditions!(sim.ocean, "impermeable", "-x +x… |
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187 |
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188 # Initialize grains in wedge north of the constriction |
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189 Granular.sortGrainsInGrid!(sim, sim.ocean) |
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190 iy = 1 |
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191 spacing_to_boundaries = r_walls |
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192 floe_padding = .5*r |
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193 noise_amplitude = floe_padding |
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194 Base.Random.srand(seed) |
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195 for iy=1:size(sim.ocean.xh, 2) |
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196 for ix=1:size(sim.ocean.xh, 1) |
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197 |
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198 for it=1:25 # number of grains to try adding per cell |
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199 |
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200 r_rand = r_min + Base.Random.rand()*(r - r_min) |
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201 pos = Granular.findEmptyPositionInGridCell(sim, sim.ocea… |
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202 ix, iy, |
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203 r_rand, n_ite… |
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204 seed=seed) |
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205 if !(typeof(pos) == Array{Float64, 1}) |
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206 continue |
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207 end |
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208 |
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209 @inbounds if pos[2] < Ly_constriction + |
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210 spacing_to_boundaries + r_rand |
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211 continue |
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212 end |
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213 |
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214 Granular.addGrainCylindrical!(sim, pos, r_rand, h, |
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215 verbose=false) |
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216 Granular.sortGrainsInGrid!(sim, sim.ocean) |
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217 end |
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218 end |
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219 end |
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220 n = length(sim.grains) - n_walls |
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221 info("added $(n) grains") |
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222 |
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223 # Remove old simulation files |
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224 Granular.removeSimulationFiles(sim) |
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225 |
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226 for i=1:length(sim.grains) |
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227 sim.grains[i].youngs_modulus = E |
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228 sim.grains[i].poissons_ratio = nu |
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229 sim.grains[i].contact_stiffness_normal = k_n |
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230 sim.grains[i].contact_stiffness_tangential = k_t |
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231 sim.grains[i].contact_viscosity_normal = gamma_n |
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232 sim.grains[i].contact_viscosity_tangential = gamma_t |
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233 sim.grains[i].contact_static_friction = mu_s |
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234 sim.grains[i].contact_dynamic_friction = mu_d |
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235 sim.grains[i].tensile_strength = tensile_strength |
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236 sim.grains[i].rotating = rotating |
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237 if sim.grains[i].fixed == true |
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238 sim.grains[i].contact_static_friction = mu_s_wall |
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239 sim.grains[i].contact_dynamic_friction = mu_d_wall |
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240 end |
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241 end |
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242 |
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243 # Set temporal parameters |
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244 Granular.setTotalTime!(sim, total_hours*60.*60.) |
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245 #Granular.setOutputFileInterval!(sim, 60.*5.) # output every 5 mins |
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246 Granular.setOutputFileInterval!(sim, 60.) # output every 1 mins |
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247 Granular.setTimeStep!(sim, verbose=verbose) |
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248 Granular.writeVTK(sim, verbose=verbose) |
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249 |
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250 println("$(sim.id) size before run") |
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251 Granular.printMemoryUsage(sim) |
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252 |
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253 profile = false |
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254 |
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255 ice_flux = Float64[] |
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256 avg_coordination_no = Float64[] |
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257 #ice_flux_sample_points = 100 |
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258 #ice_flux = zeros(ice_flux_sample_points) |
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259 #dt_ice_flux = sim.time_total/ice_flux_sample_points |
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260 #time_since_ice_flux = 1e9 |
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261 |
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262 jammed = false |
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263 it_before_eval = 100 |
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264 time_jammed = 0. |
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265 time_jammed_criterion = 60.*60. # define as jammed after this durat… |
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266 |
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267 # preallocate variables |
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268 ice_mass_outside_domain = x = y = x_ = y_ = r_rand = 0. |
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269 |
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270 while sim.time < sim.time_total |
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271 |
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272 # run simulation for it_before_eval time steps |
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273 for it=1:it_before_eval |
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274 if sim.time >= sim.time_total*.75 && profile |
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275 @profile Granular.run!(sim, status_interval=1, single_st… |
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276 verbose=verbose, show_file_output=ve… |
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277 Profile.print() |
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278 profile = false |
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279 else |
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280 Granular.run!(sim, status_interval=1, single_step=true, |
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281 verbose=verbose, show_file_output=verbose) |
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282 end |
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283 end |
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284 |
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285 if sim.time_iteration % 1_000 == 0 |
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286 @printf("\n%s size t=%5f h\n", sim.id, sim.time/3600.) |
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287 Granular.printMemoryUsage(sim) |
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288 end |
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289 |
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290 # assert if the system is jammed by looking at ice-floe mass cha… |
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291 # the number of jammed grains |
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292 if jammed |
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293 time_jammed += sim.time_dt*float(it_before_eval) |
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294 if time_jammed >= 60.*60. # 1 h |
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295 info("$t s: system jammed for more than " * |
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296 "$time_jammed_criterion s, stopping simulation") |
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297 exit() |
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298 end |
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299 end |
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300 |
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301 if sim.time_iteration % 1_000 == 0 |
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302 ice_mass_outside_domain = 0. |
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303 for icefloe in sim.grains |
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304 if !icefloe.enabled |
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305 ice_mass_outside_domain += icefloe.mass |
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306 end |
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307 end |
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308 append!(ice_flux, ice_mass_outside_domain) |
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309 |
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310 # get average coordination number around channel entrance |
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311 n_contacts_sum = 0 |
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312 n_particles = 0 |
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313 for i=1:length(sim.grains) |
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314 if !sim.grains[i].fixed && sim.grains[i].enabled |
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315 n_contacts_sum += sim.grains[i].n_contacts |
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316 n_particles += 1 |
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317 end |
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318 end |
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319 append!(avg_coordination_no, float(n_contacts_sum/n_particle… |
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320 end |
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321 |
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322 # add new grains from the top |
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323 @inbounds for ix=2:(size(sim.ocean.xh, 1) - 1) |
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324 if length(sim.ocean.grain_list[ix, end]) == 0 |
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325 for it=1:17 # number of grains to try adding per cell |
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326 # Uniform distribution |
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327 #r_rand = r_min + Base.Random.rand()*(r_max - r_min) |
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328 |
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329 # Exponential distribution with scale=1 |
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330 #r_rand = r_min + Base.Random.randexp()*(r_max - r_m… |
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331 |
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332 # Power-law distribution (sea ice power ≈ -1.8) |
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333 r_rand = Granular.randpower(1, -1.8, r_min, r_max) |
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334 |
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335 pos = Granular.findEmptyPositionInGridCell(sim, sim.… |
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336 ix, iy, |
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337 r_rand, n_i… |
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338 if !(typeof(pos) == Array{Float64, 1}) |
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339 continue |
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340 end |
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341 |
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342 Granular.addGrainCylindrical!(sim, pos, r_rand, h, |
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343 verbose=false, |
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344 youngs_modulus=E, |
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345 poissons_ratio=nu, |
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346 contact_stiffness_norm… |
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347 contact_stiffness_tang… |
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348 k_t, |
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349 contact_viscosity_norm… |
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350 gamma_n, |
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351 contact_viscosity_tang… |
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352 gamma_t, |
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353 contact_static_frictio… |
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354 contact_dynamic_fricti… |
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355 mu_d, |
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356 tensile_strength= |
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357 tensile_strength, |
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358 rotating=rotating) |
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359 Granular.sortGrainsInGrid!(sim, sim.ocean) |
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360 end |
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361 end |
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362 end |
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363 |
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364 end |
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365 |
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366 Granular.writeParaviewPythonScript(sim) |
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367 t = linspace(0., sim.time_total, length(ice_flux)) |
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368 writedlm(sim.id * "-ice-flux.txt", [t, ice_flux, avg_coordination_no… |
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369 sim = 0 |
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370 gc() |
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371 end |
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372 |
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373 function main() |
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374 parsed_args = parse_command_line() |
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375 report_args(parsed_args) |
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376 |
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377 seed = parsed_args["seed"] |
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378 |
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379 run_simulation(parsed_args["id"] * "-seed" * string(seed), |
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380 parsed_args["width"], |
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381 parsed_args["E"], |
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382 parsed_args["nu"], |
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383 parsed_args["k_n"], |
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384 parsed_args["k_t"], |
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385 parsed_args["gamma_n"], |
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386 parsed_args["gamma_t"], |
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387 parsed_args["mu_s"], |
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388 parsed_args["mu_d"], |
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389 parsed_args["mu_s_wall"], |
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390 parsed_args["mu_d_wall"], |
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391 parsed_args["tensile_strength"], |
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392 parsed_args["r_min"], |
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393 parsed_args["r_max"], |
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394 parsed_args["thickness"], |
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395 parsed_args["rotating"], |
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396 parsed_args["ocean_vel_fac"], |
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397 parsed_args["atmosphere_vel_fac"], |
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398 parsed_args["total_hours"], |
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399 seed) |
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400 end |
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401 |
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402 main() |
