source: trunk/anuga_core/source/anuga/structures/inlet.py @ 7976

Last change on this file since 7976 was 7976, checked in by habili, 12 years ago

Clean up of code. Removed references to enquiry point.

File size: 5.2 KB
Line 
1
2from anuga.geometry.polygon import inside_polygon, is_inside_polygon
3from anuga.config import velocity_protection, g
4import math
5
6import numpy as num
7
8class Inlet:
9    """Contains information associated with each inlet
10    """
11
12    def __init__(self, domain, polygon):
13
14        self.domain = domain
15        self.domain_bounding_polygon = self.domain.get_boundary_polygon()
16        self.polygon = polygon
17
18        # FIXME (SR) Using get_triangle_containing_point which needs to be sped up
19
20        self.compute_triangle_indices()
21        self.compute_area()
22
23
24    def compute_triangle_indices(self):
25
26        # Get boundary (in absolute coordinates)
27        bounding_polygon = self.domain_bounding_polygon
28        domain_centroids = self.domain.get_centroid_coordinates(absolute=True)
29
30        self.inlet_polygon = self.polygon
31
32        # Check that polygon lies within the mesh.
33        for point in self.inlet_polygon:
34                msg = 'Point %s in polygon for forcing term' %  str(point)
35                msg += ' did not fall within the domain boundary.'
36                assert is_inside_polygon(point, bounding_polygon), msg
37
38        self.triangle_indices = inside_polygon(domain_centroids, self.inlet_polygon)
39
40        if len(self.triangle_indices) == 0:
41            region = 'Inlet polygon=%s' % (self.inlet_polygon)
42            msg = 'No triangles have been identified in '
43            msg += 'specified region: %s' % region
44            raise Exception, msg
45
46
47    def compute_area(self):
48       
49        # Compute inlet area as the sum of areas of triangles identified
50        # by polygon. Must be called after compute_inlet_triangle_indices().
51        if len(self.triangle_indices) == 0:
52            region = 'Inlet polygon=%s' % (self.inlet_polygon)
53            msg = 'No triangles have been identified in '
54            msg += 'specified region: %s' % region
55            raise Exception, msg
56       
57        self.area = 0.0
58        for j in self.triangle_indices:
59            self.area += self.domain.areas[j]
60
61        msg = 'Inlet exchange area has area = %f' % self.area
62        assert self.area > 0.0
63
64
65    def get_areas(self):
66       
67        # Must be called after compute_inlet_triangle_indices().
68        return self.domain.areas.take(self.triangle_indices)
69   
70       
71    def get_stages(self):
72       
73        return self.domain.quantities['stage'].centroid_values.take(self.triangle_indices)
74       
75       
76    def get_average_stage(self):
77       
78        return num.sum(self.get_stages())/self.triangle_indices.size
79       
80       
81    def get_elevations(self):   
82       
83        return self.domain.quantities['elevation'].centroid_values.take(self.triangle_indices)
84       
85    def get_average_elevation(self):
86       
87        return num.sum(self.get_elevations())/self.triangle_indices.size
88   
89   
90    def get_xmoms(self):
91   
92        return self.domain.quantities['xmomentum'].centroid_values.take(self.triangle_indices)
93       
94       
95    def get_average_xmom(self):
96       
97        return num.sum(self.get_xmoms())/self.triangle_indices.size
98       
99   
100    def get_ymoms(self):
101       
102        return self.domain.quantities['ymomentum'].centroid_values.take(self.triangle_indices)
103 
104 
105    def get_average_ymom(self):
106       
107        return num.sum(self.get_ymoms())/self.triangle_indices.size
108 
109   
110    def get_heights(self):
111   
112        return self.get_stages() - self.get_elevations()
113   
114   
115    def get_total_water_volume(self):
116       
117       return num.sum(self.get_heights()*self.get_areas())
118   
119   
120    def get_average_height(self):
121   
122        return self.get_total_water_volume()/self.area
123       
124       
125    def get_velocities(self):
126       
127            depths = self.get_stages() - self.get_elevations()
128            u = self.get_xmoms()/(depths + velocity_protection/depths)
129            v = self.get_ymoms()/(depths + velocity_protection/depths)
130           
131            return u, v
132           
133           
134    def get_average_speed(self):
135 
136            u, v = self.get_velocities()
137           
138            average_u = num.sum(u)/self.triangle_indices.size
139            average_v = num.sum(v)/self.triangle_indices.size
140           
141            return math.sqrt(average_u**2 + average_v**2)
142
143
144
145    def get_average_velocity_head(self):
146
147        return 0.5*self.get_average_speed()**2/g
148
149
150    def get_average_total_energy(self):
151       
152        return self.get_average_velocity_head() + self.get_average_stage()
153       
154   
155    def get_average_specific_energy(self):
156       
157        return self.get_average_velocity_head() + self.get_average_height()
158
159
160
161    def set_heights(self,height):
162
163        self.domain.quantities['stage'].centroid_values.put(self.triangle_indices, self.get_elevations() + height)
164
165
166    def set_stages(self,stage):
167
168        self.domain.quantities['stage'].centroid_values.put(self.triangle_indices, stage)
169
170    def set_xmoms(self,xmom):
171
172        self.xmoms=self.domain.quantities['xmomentum'].centroid_values.put(self.triangle_indices, xmom)
173
174
175    def set_ymoms(self,ymom):
176
177        self.xmoms=self.domain.quantities['ymomentum'].centroid_values.put(self.triangle_indices, ymom)
178
179
180    def set_elevations(self,elevation):
181
182        self.domain.quantities['elevation'].centroid_values.put(self.triangle_indices, elevation)
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