# source:anuga_core/documentation/user_manual/examples/channel_3.py@3747

Last change on this file since 3747 was 3747, checked in by ole, 18 years ago

Moved channel examples to user manual

File size: 2.6 KB
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1"""Simple water flow example using ANUGA
2
3Water flowing down a channel
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 = 40.
20width = 5.
21dx = dy = 1           # Resolution: Length of subdivisions on both axes
22
23points, vertices, boundary = rectangular_cross(int(length/dx), int(width/dy), len1=length, len2=width)
24domain = Domain(points, vertices, boundary)
25domain.set_name('channel_3')                  # Output name
26
27
28#------------------------------------------------------------------------------
29# Setup initial conditions
30#------------------------------------------------------------------------------
31def topography(x,y):
32    z = -x/10                             # linear bed slope
33
34    N = len(x)
35    for i in range(N):
36
37        #Step
38        if 10 < x[i] < 12:
39            z[i] += 0.4 - 0.05*y[i]
40
41        #Constriction
42        if 27 < x[i] < 29 and y[i] > 3:
43            z[i] += 2
44
45        # Pole
46        if (x[i] - 34)**2 + (y[i] - 2)**2 < 0.4**2:
47            z[i] += 2
48
49    return z
50
51
52domain.set_quantity('elevation', topography)            # Use function for elevation
53domain.set_quantity('friction', 0.01)                   # Constant friction
54domain.set_quantity('stage', expression='elevation')    # Dry
55
56
57#------------------------------------------------------------------------------
58# Setup boundary conditions
59#------------------------------------------------------------------------------
60Bi = Dirichlet_boundary([0.4, 0, 0])                            # Inflow
61Br = Reflective_boundary(domain)                                # Solid reflective wall
62Bo = Dirichlet_boundary([-5, 0, 0])                             # Outflow
63
64domain.set_boundary({'left': Bi, 'right': Bo, 'top': Br, 'bottom': Br})
65
66
67#------------------------------------------------------------------------------
68# Evolve system through time
69#------------------------------------------------------------------------------
70for t in domain.evolve(yieldstep = 0.2, finaltime = 16.0):
71    domain.write_time()
72
73
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