source: anuga_core/documentation/user_manual/examples/channel2.py @ 3754

Last change on this file since 3754 was 3754, checked in by ole, 17 years ago

Added channel examples to user manual

File size: 2.5 KB
Line 
1"""Simple water flow example using ANUGA
2
3Water flowing down a channel with changing boundary conditions
4"""
5
6#------------------------------------------------------------------------------
7# Import necessary modules
8#------------------------------------------------------------------------------
9from anuga.abstract_2d_finite_volumes.mesh_factory import rectangular_cross
10from anuga.shallow_water import Domain
11from anuga.shallow_water import Reflective_boundary
12from anuga.shallow_water import Dirichlet_boundary
13from anuga.shallow_water import Time_boundary
14
15
16#------------------------------------------------------------------------------
17# Setup computational domain
18#------------------------------------------------------------------------------
19length = 10.
20width = 5.
21dx = dy = 1           # Resolution: Length of subdivisions on both axes
22
23points, vertices, boundary = rectangular_cross(int(length/dx), int(width/dy),
24                                               len1=length, len2=width)
25domain = Domain(points, vertices, boundary)   
26domain.set_name('channel_2')                 # Output name
27
28
29#------------------------------------------------------------------------------
30# Setup initial conditions
31#------------------------------------------------------------------------------
32def topography(x,y):
33    return -x/10                             # linear bed slope
34
35domain.set_quantity('elevation', topography) # Use function for elevation
36domain.set_quantity('friction', 0.01)        # Constant friction
37domain.set_quantity('stage',
38                    expression='elevation')  # Dry initial condition
39
40
41#------------------------------------------------------------------------------
42# Setup boundary conditions
43#------------------------------------------------------------------------------
44Bi = Dirichlet_boundary([0.4, 0, 0])         # Inflow
45Br = Reflective_boundary(domain)             # Solid reflective wall
46Bo = Dirichlet_boundary([-5, 0, 0])          # Outflow
47
48domain.set_boundary({'left': Bi, 'right': Br, 'top': Br, 'bottom': Br})
49
50
51#------------------------------------------------------------------------------
52# Evolve system through time
53#------------------------------------------------------------------------------
54for t in domain.evolve(yieldstep = 0.2, finaltime = 40.0):
55    domain.write_time()
56
57    if domain.get_quantity('stage').\
58           get_values(interpolation_points=[[10, 2.5]]) > 0:       
59        print 'Stage > 0: Changing to outflow boundary'
60        domain.modify_boundary({'right': Bo})
61
62
63
64
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