| 1 | |
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| 2 | from anuga.geometry.polygon import inside_polygon, is_inside_polygon |
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| 3 | from anuga.config import velocity_protection, g |
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| 4 | import math |
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| 5 | |
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| 6 | import numpy as num |
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| 7 | |
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| 8 | class Inlet: |
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| 9 | """Contains information associated with each inlet |
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| 10 | """ |
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| 11 | |
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| 12 | def __init__(self, domain, polygon, enquiry_point, inlet_vector): |
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| 13 | |
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| 14 | self.domain = domain |
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| 15 | self.domain_bounding_polygon = self.domain.get_boundary_polygon() |
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| 16 | self.polygon = polygon |
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| 17 | self.enquiry_point = enquiry_point |
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| 18 | self.inlet_vector = inlet_vector |
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| 19 | |
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| 20 | # FIXME (SR) Using get_triangle_containing_point which needs to be sped up |
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| 21 | self.enquiry_index = self.domain.get_triangle_containing_point(self.enquiry_point) |
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| 22 | |
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| 23 | self.compute_triangle_indices() |
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| 24 | self.compute_area() |
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| 25 | |
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| 26 | |
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| 27 | def compute_triangle_indices(self): |
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| 28 | |
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| 29 | # Get boundary (in absolute coordinates) |
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| 30 | bounding_polygon = self.domain_bounding_polygon |
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| 31 | domain_centroids = self.domain.get_centroid_coordinates(absolute=True) |
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| 32 | |
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| 33 | self.inlet_polygon = self.polygon |
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| 34 | |
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| 35 | # Check that polygon lies within the mesh. |
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| 36 | for point in self.inlet_polygon: |
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| 37 | msg = 'Point %s in polygon for forcing term' % str(point) |
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| 38 | msg += ' did not fall within the domain boundary.' |
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| 39 | assert is_inside_polygon(point, bounding_polygon), msg |
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| 40 | |
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| 41 | self.triangle_indices = inside_polygon(domain_centroids, self.inlet_polygon) |
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| 42 | |
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| 43 | if len(self.triangle_indices) == 0: |
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| 44 | region = 'Inlet polygon=%s' % (self.inlet_polygon) |
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| 45 | msg = 'No triangles have been identified in ' |
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| 46 | msg += 'specified region: %s' % region |
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| 47 | raise Exception, msg |
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| 48 | |
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| 49 | |
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| 50 | def compute_area(self): |
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| 51 | |
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| 52 | # Compute inlet area as the sum of areas of triangles identified |
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| 53 | # by polygon. Must be called after compute_inlet_triangle_indices(). |
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| 54 | if len(self.triangle_indices) == 0: |
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| 55 | region = 'Inlet polygon=%s' % (self.inlet_polygon) |
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| 56 | msg = 'No triangles have been identified in ' |
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| 57 | msg += 'specified region: %s' % region |
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| 58 | raise Exception, msg |
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| 59 | |
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| 60 | self.area = 0.0 |
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| 61 | for j in self.triangle_indices: |
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| 62 | self.area += self.domain.areas[j] |
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| 63 | |
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| 64 | msg = 'Inlet exchange area has area = %f' % self.area |
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| 65 | assert self.area > 0.0 |
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| 66 | |
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| 67 | |
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| 68 | def get_areas(self): |
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| 69 | |
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| 70 | # Must be called after compute_inlet_triangle_indices(). |
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| 71 | return self.domain.areas.take(self.triangle_indices) |
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| 72 | |
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| 73 | |
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| 74 | def get_stages(self): |
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| 75 | |
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| 76 | return self.domain.quantities['stage'].centroid_values.take(self.triangle_indices) |
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| 77 | |
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| 78 | |
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| 79 | def get_average_stage(self): |
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| 80 | |
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| 81 | return num.sum(self.get_stages())/self.triangle_indices.size |
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| 82 | |
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| 83 | |
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| 84 | def get_elevations(self): |
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| 85 | |
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| 86 | return self.domain.quantities['elevation'].centroid_values.take(self.triangle_indices) |
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| 87 | |
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| 88 | def get_average_elevation(self): |
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| 89 | |
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| 90 | return num.sum(self.get_elevations())/self.triangle_indices.size |
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| 91 | |
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| 92 | |
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| 93 | def get_xmoms(self): |
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| 94 | |
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| 95 | return self.domain.quantities['xmomentum'].centroid_values.take(self.triangle_indices) |
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| 96 | |
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| 97 | |
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| 98 | def get_average_xmom(self): |
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| 99 | |
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| 100 | return num.sum(self.get_xmoms())/self.triangle_indices.size |
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| 101 | |
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| 102 | |
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| 103 | def get_ymoms(self): |
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| 104 | |
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| 105 | return self.domain.quantities['ymomentum'].centroid_values.take(self.triangle_indices) |
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| 106 | |
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| 107 | |
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| 108 | def get_average_ymom(self): |
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| 109 | |
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| 110 | return num.sum(self.get_ymoms())/self.triangle_indices.size |
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| 111 | |
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| 112 | |
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| 113 | def get_heights(self): |
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| 114 | |
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| 115 | return self.get_stages() - self.get_elevations() |
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| 116 | |
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| 117 | |
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| 118 | def get_total_water_volume(self): |
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| 119 | |
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| 120 | return num.sum(self.get_heights()*self.get_areas()) |
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| 121 | |
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| 122 | |
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| 123 | def get_average_height(self): |
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| 124 | |
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| 125 | return self.get_total_water_volume()/self.area |
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| 126 | |
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| 127 | |
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| 128 | def get_velocities(self): |
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| 129 | |
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| 130 | depths = self.get_stages() - self.get_elevations() |
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| 131 | u = self.get_xmoms()/(depths + velocity_protection/depths) |
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| 132 | v = self.get_ymoms()/(depths + velocity_protection/depths) |
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| 133 | |
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| 134 | return u, v |
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| 135 | |
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| 136 | |
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| 137 | def get_average_speed(self): |
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| 138 | |
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| 139 | u, v = self.get_velocities() |
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| 140 | |
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| 141 | average_u = num.sum(u)/self.triangle_indices.size |
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| 142 | average_v = num.sum(v)/self.triangle_indices.size |
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| 143 | |
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| 144 | return math.sqrt(average_u**2 + average_v**2) |
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| 145 | |
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| 146 | |
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| 147 | |
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| 148 | def get_average_velocity_head(self): |
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| 149 | |
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| 150 | return 0.5*self.get_average_speed()**2/g |
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| 151 | |
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| 152 | |
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| 153 | def get_average_total_energy(self): |
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| 154 | |
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| 155 | return self.get_average_velocity_head() + self.get_average_stage() |
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| 156 | |
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| 157 | |
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| 158 | def get_average_specific_energy(self): |
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| 159 | |
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| 160 | return self.get_average_velocity_head() + self.get_average_height() |
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| 161 | |
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| 162 | |
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| 163 | |
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| 164 | def set_heights(self,height): |
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| 165 | |
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| 166 | self.domain.quantities['stage'].centroid_values.put(self.triangle_indices, self.get_elevations() + height) |
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| 167 | |
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| 168 | |
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| 169 | def set_stages(self,stage): |
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| 170 | |
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| 171 | self.domain.quantities['stage'].centroid_values.put(self.triangle_indices, stage) |
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| 172 | |
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| 173 | def set_xmoms(self,xmom): |
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| 174 | |
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| 175 | self.xmoms=self.domain.quantities['xmomentum'].centroid_values.put(self.triangle_indices, xmom) |
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| 176 | |
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| 177 | |
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| 178 | def set_ymoms(self,ymom): |
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| 179 | |
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| 180 | self.xmoms=self.domain.quantities['ymomentum'].centroid_values.put(self.triangle_indices, ymom) |
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| 181 | |
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| 182 | |
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| 183 | def set_elevations(self,elevation): |
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| 184 | |
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| 185 | self.domain.quantities['elevation'].centroid_values.put(self.triangle_indices, elevation) |
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