source:anuga_work/development/sudi/sw_1d/periodic_waves/johns/config.py@7837

Last change on this file since 7837 was 7837, checked in by mungkasi, 13 years ago

Again, adding some codes for 1d problems on debris avalanche and periodic waves.

File size: 3.0 KB
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1"""Module where global model parameters are set for anuga_1d
2"""
3
4epsilon = 1.0e-6#12
5h0 = 1.0e-12
6
7default_boundary_tag = 'exterior'
8
9
10time_format = '%d/%m/%y %H:%M:%S'
11
12min_timestep = 1.0e-6 #Should be computed based on geometry
13max_timestep = 1.0e3
14max_smallsteps = 50  # Max number of degenerate steps allowed b4 trying first order
15#This is how:
16#Define maximal possible speed in open water v_max, e.g. 500m/s (soundspeed?)
17#Then work out minimal internal distance in mesh r_min and set
18#min_timestep = r_min/v_max
19#
20#Max speeds are calculated in the flux function as
21#
22#lambda = v +/- sqrt(gh)
23#
24# so with 500 m/s, h ~ 500^2/g = 2500 m well out of the domain of the
25# shallow water wave equation
26#
27#The actual soundspeed can be as high as 1530m/s
28#(see http://staff.washington.edu/aganse/public.projects/clustering/clustering.html),
29#but that would only happen with h>225000m in this equation. Why ?
30#The maximal speed we specify is really related to the max speed
31#of surface pertubation
32#
33
34
35v_max = 100 #For use in domain_ext.c
36sound_speed = 500
37
38
39max_smallsteps = 50  #Max number of degenerate steps allowed b4 trying first order
40
41manning = 0.0  #Manning's friction coefficient
42g = 9.81       #Gravity
43#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
44#The 'official' average is 9.80665
45
46
47
48
49eta_w = 3.0e-3 #Wind stress coefficient
50rho_a = 1.2e-3 #Atmospheric density
51rho_w = 1023   #Fluid density [kg/m^3] (rho_w = 1023 for salt water)
52
53
54#Betas [0;1] control the allowed steepness of gradient for second order
55#extrapolations. Values of 1 allow the steepes gradients while
56#lower values are more conservative. Values of 0 correspond to
57#1'st order extrapolations.
58#
59# Large values of beta_h may cause simulations to require more timesteps
60# as surface will 'hug' closer to the bed.
61# Small values of beta_h will make code faster, but one may experience
62# artificial momenta caused by discontinuities in water depths in
63# the presence of steep slopes. One example of this would be
64# stationary water 'lapping' upwards to a higher point on the coast.
65#
66#
67#
68#There are separate betas for the w-limiter and the h-limiter
69#
70#
71#
72#
73#Good values are:
74#beta_w = 0.9
75#beta_h = 0.2
76
77
78
79beta_w = 1.5
80beta_h = 0.2
81timestepping_method = 'euler'
82
83CFL = 1.0  #FIXME (ole): Is this in use yet??
84           #(Steve) yes, change domain.CFL to
85           #make changes
86
87
88pmesh_filename = '.\\pmesh'
89
90
91import os, sys
92
93if sys.platform == 'win32':
94    #default_datadir = 'C:\grohm_output'
95    default_datadir = '.'
96else:
97    #default_datadir = os.path.expanduser('~'+os.sep+'grohm_output')
98    default_datadir = '.'
99
100
101use_extensions = True    #Try to use C-extensions
102#use_extensions = False   #Do not use C-extensions
103
104use_psyco = True  #Use psyco optimisations
105#use_psyco = False  #Do not use psyco optimisations
106
107
108optimised_gradient_limiter = True #Use hardwired gradient limiter
109
110#Specific to shallow water W.E.
111h_min = minimum_allowed_height = 1.0e-6 #1.0e-6 #Water depth below which it is considered to be 0
112maximum_allowed_speed = 1000.0
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