1 | """Module where global pyvolution model parameters are set |
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2 | """ |
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3 | |
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4 | |
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5 | #FIXME (Ole): Temporary access to global config file |
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6 | from anuga_config import epsilon, default_boundary_tag |
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7 | |
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8 | |
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9 | |
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10 | #FIXME (Ole): More of these may need to be moved to anuga_config.py |
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11 | time_format = '%d/%m/%y %H:%M:%S' |
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12 | |
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13 | min_timestep = 1.0e-6 #Should be computed based on geometry |
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14 | max_timestep = 1.0e+3 |
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15 | #This is how: |
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16 | #Define maximal possible speed in open water v_max, e.g. 500m/s (soundspeed?) |
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17 | #Then work out minimal internal distance in mesh r_min and set |
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18 | #min_timestep = r_min/v_max |
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19 | # |
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20 | #Max speeds are calculated in the flux function as |
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21 | # |
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22 | #lambda = v +/- sqrt(gh) |
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23 | # |
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24 | # so with 500 m/s, h ~ 500^2/g = 2500 m well out of the domain of the |
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25 | # shallow water wave equation |
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26 | # |
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27 | #The actual soundspeed can be as high as 1530m/s |
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28 | #(see http://staff.washington.edu/aganse/public.projects/clustering/clustering.html), |
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29 | #but that would only happen with h>225000m in this equation. Why ? |
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30 | #The maximal speed we specify is really related to the max speed |
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31 | #of surface pertubation |
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32 | # |
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33 | |
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34 | |
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35 | #v_max = 100 #For use in domain_ext.c |
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36 | sound_speed = 500 |
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37 | |
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38 | |
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39 | max_smallsteps = 50 #Max number of degenerate steps allowed b4 trying first order |
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40 | |
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41 | manning = 0.03 #Manning's friction coefficient |
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42 | #g = 9.80665 #Gravity |
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43 | g = 9.8 |
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44 | #g(phi) = 9780313 * (1 + 0.0053024 sin(phi)**2 - 0.000 0059 sin(2*phi)**2) micro m/s**2, where phi is the latitude |
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45 | #The 'official' average is 9.80665 |
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46 | |
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47 | |
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48 | |
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49 | |
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50 | eta_w = 3.0e-3 #Wind stress coefficient |
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51 | rho_a = 1.2e-3 #Atmospheric density |
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52 | rho_w = 1023 #Fluid density [kg/m^3] (rho_w = 1023 for salt water) |
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53 | |
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54 | |
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55 | #Betas [0;1] control the allowed steepness of gradient for second order |
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56 | #extrapolations. Values of 1 allow the steepes gradients while |
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57 | #lower values are more conservative. Values of 0 correspond to |
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58 | #1'st order extrapolations. |
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59 | # |
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60 | # Large values of beta_h may cause simulations to require more timesteps |
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61 | # as surface will 'hug' closer to the bed. |
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62 | # Small values of beta_h will make code faster, but one may experience |
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63 | # artificial momenta caused by discontinuities in water depths in |
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64 | # the presence of steep slopes. One example of this would be |
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65 | # stationary water 'lapping' upwards to a higher point on the coast. |
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66 | # |
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67 | # NOTE (Ole): I believe this was addressed with the introduction of |
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68 | # tight_slope_limiters. I wish to retire the beta_? parameters. |
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69 | # Can you please let me know if you disagree? |
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70 | |
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71 | |
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72 | #There are separate betas for the w, uh, vh and h limiters |
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73 | # |
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74 | #Good values are: |
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75 | |
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76 | |
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77 | # I think these are better SR but they conflict with the unit tests! |
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78 | beta_w = 1.0 |
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79 | beta_w_dry = 0.2 |
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80 | beta_uh = 1.0 |
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81 | beta_uh_dry = 0.2 |
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82 | beta_vh = 1.0 |
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83 | beta_vh_dry = 0.2 |
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84 | beta_h = 0.2 |
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85 | |
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86 | # beta_h can be safely put to zero esp if we are using |
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87 | # tight_slope_limiters = 1. This will |
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88 | # also speed things up in general |
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89 | beta_h = 0.0 |
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90 | |
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91 | |
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92 | # Alpha_balance controls how limiters are balanced between deep and shallow. |
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93 | # A large value will favour the deep water limiters, allowing the a closer hug to the coastline. |
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94 | # This will minimise 'creep' but at the same time cause smaller time steps |
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95 | # Range: |
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96 | |
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97 | alpha_balance = 2.0 |
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98 | |
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99 | # Flag use of new limiters. |
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100 | # tight_slope_limiters = 0 means use old limiters (e.g. for some tests) |
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101 | # tight_slope_limiters = 1 means use new limiters that hug the bathymetry closer |
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102 | tight_slope_limiters = 0 |
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103 | |
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104 | |
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105 | |
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106 | CFL = 1.0 #FIXME (ole): Is this in use yet?? |
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107 | #(Steve) yes, change domain.CFL to |
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108 | #make changes |
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109 | |
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110 | # Choose type of timestepping, |
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111 | timestepping_method = 'euler' # 1st order euler |
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112 | #timestepping_method = 'rk2' # 2nd Order TVD scheme |
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113 | |
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114 | # Option to search for signatures where isolated triangles are |
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115 | # responsible for a small global timestep. |
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116 | # Treating these by limiting their momenta may help speed up the |
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117 | # overall computation. |
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118 | # This facility is experimental. |
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119 | protect_against_isolated_degenerate_timesteps = False |
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120 | |
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121 | pmesh_filename = '.\\pmesh' |
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122 | version_filename = 'stored_version_info.py' |
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123 | |
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124 | |
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125 | import os, sys |
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126 | |
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127 | if sys.platform == 'win32': |
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128 | default_datadir = '.' |
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129 | else: |
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130 | default_datadir = '.' |
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131 | |
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132 | |
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133 | use_extensions = True #Try to use C-extensions |
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134 | #use_extensions = False #Do not use C-extensions |
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135 | |
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136 | use_psyco = True #Use psyco optimisations |
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137 | #use_psyco = False #Do not use psyco optimisations |
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138 | |
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139 | |
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140 | optimise_dry_cells = True # Exclude dry and still cells from flux computation |
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141 | |
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142 | optimised_gradient_limiter = True # Use hardwired gradient limiter |
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143 | |
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144 | #Specific to shallow water W.E. |
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145 | minimum_allowed_height = 1.0e-3 #Water depth below which it is considered to be 0 in the model |
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146 | |
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147 | maximum_allowed_speed = 0.0 # Maximal particle speed of water |
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148 | #maximum_allowed_speed = 1.0 # Maximal particle speed of water |
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149 | # Too large (100) creates 'flopping' water |
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150 | # Too small (0) creates 'creep' |
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151 | |
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152 | |
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153 | minimum_storable_height = 1.0e-5 # Water depth below which it is *stored* as 0 |
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154 | |
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155 | points_file_block_line_size = 500 # Number of lines read in from a points file |
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156 | # when blocking |
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157 | |
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158 | umask = 002 # used to set file and directory permission created by anuga |
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159 | |
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160 | max_float = 1.0e36 # Largest number. Used to initialise (max, min) ranges. |
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161 | |
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