| 1 | """Module where global model parameters are set for anuga_1d |
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| 2 | """ |
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| 3 | |
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| 4 | epsilon = 1.0e-6 |
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| 5 | h0 = 1.0e-6 |
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| 6 | |
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| 7 | default_boundary_tag = 'exterior' |
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| 8 | |
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| 9 | |
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| 10 | time_format = '%d/%m/%y %H:%M:%S' |
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| 11 | |
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| 12 | min_timestep = 1.0e-6 #Should be computed based on geometry |
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| 13 | max_timestep = 1.0e3 |
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| 14 | max_smallsteps = 50 # Max number of degenerate steps allowed b4 trying first order |
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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 | |
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| 36 | max_smallsteps = 50 #Max number of degenerate steps allowed b4 trying first order |
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| 37 | |
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| 38 | manning = 0.0 #Manning's friction coefficient |
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| 39 | g = 9.8 #Gravity |
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| 40 | #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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| 41 | #The 'official' average is 9.80665 |
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| 42 | |
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| 43 | |
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| 44 | |
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| 45 | |
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| 46 | |
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| 47 | |
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| 48 | beta_w = 1.0 |
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| 49 | beta_h = 1.0 |
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| 50 | timestepping_method = 'rk2' |
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| 51 | |
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| 52 | CFL = 1.0 #FIXME (ole): Is this in use yet?? |
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| 53 | #(Steve) yes, change domain.CFL to |
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| 54 | #make changes |
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| 55 | |
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| 56 | |
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| 57 | pmesh_filename = '.\\pmesh' |
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| 58 | |
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| 59 | |
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| 60 | import os, sys |
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| 61 | |
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| 62 | if sys.platform == 'win32': |
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| 63 | #default_datadir = 'C:\grohm_output' |
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| 64 | default_datadir = '.' |
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| 65 | else: |
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| 66 | #default_datadir = os.path.expanduser('~'+os.sep+'grohm_output') |
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| 67 | default_datadir = '.' |
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| 68 | |
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| 69 | |
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| 70 | #use_extensions = True #Try to use C-extensions |
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| 71 | ##use_extensions = False #Do not use C-extensions |
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| 72 | # |
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| 73 | #use_psyco = True #Use psyco optimisations |
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| 74 | ##use_psyco = False #Do not use psyco optimisations |
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| 75 | # |
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| 76 | # |
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| 77 | #optimised_gradient_limiter = True #Use hardwired gradient limiter |
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| 78 | |
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| 79 | #Specific to shallow water W.E. |
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| 80 | h_min = minimum_allowed_height = 1.0e-6 #1.0e-6 #Water depth below which it is considered to be 0 |
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| 81 | maximum_allowed_speed = 1000.0 |
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