[3689] | 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 | # |
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| 68 | # |
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| 69 | #There are separate betas for the w, uh, vh and h limiters |
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| 70 | # |
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| 71 | #Good values are: |
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| 72 | |
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[3704] | 73 | |
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[3689] | 74 | # I think these are better SR but they conflict with the unit tests! |
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[3704] | 75 | beta_w = 1.0 |
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| 76 | beta_w_dry = 0.2 |
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| 77 | beta_uh = 1.0 |
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| 78 | beta_uh_dry = 0.2 |
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| 79 | beta_vh = 1.0 |
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| 80 | beta_vh_dry = 0.2 |
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| 81 | beta_h = 0.2 |
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[3689] | 82 | |
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| 83 | |
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| 84 | CFL = 1.0 #FIXME (ole): Is this in use yet?? |
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| 85 | #(Steve) yes, change domain.CFL to |
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| 86 | #make changes |
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| 87 | |
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| 88 | |
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| 89 | pmesh_filename = '.\\pmesh' |
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| 90 | |
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| 91 | |
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| 92 | import os, sys |
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| 93 | |
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| 94 | if sys.platform == 'win32': |
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| 95 | default_datadir = '.' |
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| 96 | else: |
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| 97 | default_datadir = '.' |
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| 98 | |
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| 99 | |
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| 100 | use_extensions = True #Try to use C-extensions |
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| 101 | #use_extensions = False #Do not use C-extensions |
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| 102 | |
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| 103 | use_psyco = True #Use psyco optimisations |
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| 104 | #use_psyco = False #Do not use psyco optimisations |
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| 105 | |
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| 106 | |
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| 107 | optimised_gradient_limiter = True #Use hardwired gradient limiter |
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| 108 | |
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| 109 | #Specific to shallow water W.E. |
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| 110 | minimum_allowed_height = 1.0e-3 #Water depth below which it is considered to be 0 in the model |
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| 111 | maximum_allowed_speed = 100.0 #Maximal particle speed of water |
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| 112 | |
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| 113 | minimum_storable_height = minimum_allowed_height #Water depth below which it is *stored* as 0 |
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