| 1 | from anuga.geometry.polygon import inside_polygon, polygon_area |
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| 2 | from anuga.config import g |
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| 3 | import anuga.utilities.log as log |
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| 4 | import inlet |
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| 5 | import numpy as num |
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| 6 | import math |
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| 7 | |
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| 8 | class Culvert: |
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| 9 | """Culvert flow - transfer water from one rectangular box to another. |
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| 10 | Sets up the geometry of problem |
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| 11 | |
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| 12 | This is the base class for culverts. Inherit from this class (and overwrite |
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| 13 | compute_discharge method for specific subclasses) |
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| 14 | |
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| 15 | Input: Two points, pipe_size (either diameter or width, height), |
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| 16 | mannings_rougness, |
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| 17 | """ |
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| 18 | |
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| 19 | def __init__(self, |
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| 20 | domain, |
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| 21 | end_points, |
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| 22 | width, |
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| 23 | height, |
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| 24 | apron, |
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| 25 | enquiry_gap, |
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| 26 | verbose): |
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| 27 | |
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| 28 | # Input check |
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| 29 | |
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| 30 | self.domain = domain |
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| 31 | self.end_points = end_points |
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| 32 | self.width = width |
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| 33 | self.height = height |
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| 34 | self.apron = apron |
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| 35 | self.enquiry_gap = enquiry_gap |
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| 36 | self.verbose=verbose |
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| 37 | |
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| 38 | # Create the fundamental culvert polygons and create inlet objects |
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| 39 | self.__create_culvert_polygons() |
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| 40 | |
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| 41 | #FIXME (SR) Put this into a foe loop to deal with more inlets |
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| 42 | |
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| 43 | self.inlets = [] |
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| 44 | polygon0 = self.inlet_polygons[0] |
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| 45 | ep0 = self.inlet_equiry_pts[0] |
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| 46 | outward_vector0 = self.culvert_vector |
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| 47 | self.inlets.append(inlet.Inlet(self.domain, polygon0, ep0, outward_vector0)) |
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| 48 | |
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| 49 | polygon1 = self.inlet_polygons[1] |
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| 50 | ep1 = self.inlet_equiry_pts[1] |
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| 51 | outward_vector1 = - self.culvert_vector |
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| 52 | self.inlets.append(inlet.Inlet(self.domain, polygon1, ep1, outward_vector1)) |
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| 53 | |
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| 54 | |
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| 55 | def __call__(self): |
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| 56 | msg = 'Method __call__ must be overridden by Culvert subclass' |
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| 57 | raise Exception, msg |
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| 58 | |
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| 59 | def __create_culvert_polygons(self): |
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| 60 | |
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| 61 | """Create polygons at the end of a culvert inlet and outlet. |
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| 62 | At either end two polygons will be created; one for the actual flow to pass through and one a little further away |
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| 63 | for enquiring the total energy at both ends of the culvert and transferring flow. |
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| 64 | """ |
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| 65 | |
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| 66 | # Calculate geometry |
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| 67 | x0, y0 = self.end_points[0] |
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| 68 | x1, y1 = self.end_points[1] |
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| 69 | |
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| 70 | dx = x1 - x0 |
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| 71 | dy = y1 - y0 |
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| 72 | |
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| 73 | self.culvert_vector = num.array([dx, dy]) |
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| 74 | self.culvert_length = math.sqrt(num.sum(self.culvert_vector**2)) |
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| 75 | assert self.culvert_length > 0.0, 'The length of culvert is less than 0' |
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| 76 | |
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| 77 | # Unit direction vector and normal |
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| 78 | self.culvert_vector /= self.culvert_length # Unit vector in culvert direction |
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| 79 | self.culvert_normal = num.array([-dy, dx])/self.culvert_length # Normal vector |
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| 80 | |
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| 81 | # Short hands |
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| 82 | w = 0.5*self.width*self.culvert_normal # Perpendicular vector of 1/2 width |
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| 83 | h = self.apron*self.culvert_vector # Vector of length=height in the |
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| 84 | # direction of the culvert |
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| 85 | |
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| 86 | gap = (1 + self.enquiry_gap)*h |
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| 87 | |
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| 88 | self.inlet_polygons = [] |
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| 89 | self.inlet_equiry_pts = [] |
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| 90 | |
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| 91 | # Build exchange polygon and enquiry point |
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| 92 | for i in [0, 1]: |
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| 93 | i0 = (2*i-1) |
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| 94 | p0 = self.end_points[i] + w |
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| 95 | p1 = self.end_points[i] - w |
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| 96 | p2 = p1 + i0*h |
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| 97 | p3 = p0 + i0*h |
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| 98 | ep = self.end_points[i] + i0*gap |
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| 99 | |
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| 100 | self.inlet_polygons.append(num.array([p0, p1, p2, p3])) |
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| 101 | self.inlet_equiry_pts.append(ep) |
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| 102 | |
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| 103 | # Check that enquiry points are outside inlet polygons |
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| 104 | for i in [0,1]: |
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| 105 | polygon = self.inlet_polygons[i] |
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| 106 | ep = self.inlet_equiry_pts[i] |
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| 107 | |
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| 108 | area = polygon_area(polygon) |
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| 109 | |
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| 110 | msg = 'Polygon %s ' %(polygon) |
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| 111 | msg += ' has area = %f' % area |
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| 112 | assert area > 0.0, msg |
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| 113 | |
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| 114 | msg = 'Enquiry point falls inside an exchange polygon.' |
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| 115 | assert not inside_polygon(ep, polygon), msg |
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| 116 | |
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| 117 | def get_inlets(self): |
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| 118 | |
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| 119 | return self.inlets |
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| 120 | |
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| 121 | |
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| 122 | def get_culvert_length(self): |
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| 123 | |
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| 124 | return self.culvert_length |
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| 125 | |
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| 126 | |
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| 127 | def get_culvert_width(self): |
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| 128 | |
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| 129 | return self.width |
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| 130 | |
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| 131 | |
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| 132 | def get_culvert_height(self): |
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| 133 | |
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| 134 | return self.height |
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| 135 | |
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| 136 | |
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| 137 | def get_culvert_apron(self): |
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| 138 | |
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| 139 | return self.apron |
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| 140 | |
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