[2229] | 1 | """Simulation of the nonsymmetrical dam dreak problem. |
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| 2 | |
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| 3 | Copyright 2005 |
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| 4 | Christopher Zoppou, Stephen Roberts |
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| 5 | Australian National University |
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| 6 | |
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| 7 | """ |
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| 8 | |
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| 9 | #--------------------------------------- |
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| 10 | # Setup Path and import modules |
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| 11 | import sys |
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| 12 | from os import sep, path |
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| 13 | sys.path.append('..'+sep+'pyvolution') |
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| 14 | |
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| 15 | from shallow_water import Domain, Transmissive_boundary, Reflective_boundary,\ |
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| 16 | Dirichlet_boundary |
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| 17 | #from pmesh2domain import pmesh_to_domain_instance |
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[3514] | 18 | from anuga.pyvolution.util import Polygon_function |
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[2229] | 19 | from mesh_factory import rectangular_cross |
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| 20 | |
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| 21 | |
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| 22 | def cut_out_region(domain): |
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| 23 | """ |
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| 24 | To do: make better comments! |
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| 25 | Deal with passing the boundary info as well |
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| 26 | """ |
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| 27 | |
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| 28 | points = domain.coordinates |
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| 29 | elements = domain.triangles |
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| 30 | boundary = domain.boundary |
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| 31 | centroid_coordinates = domain.centroid_coordinates |
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| 32 | N = domain.number_of_elements |
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| 33 | |
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| 34 | elements_in = [] |
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| 35 | elements_out = [] |
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| 36 | for i in range(N): |
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| 37 | element = elements[i] |
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| 38 | #print element |
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| 39 | [x,y] = centroid_coordinates[i] |
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| 40 | #print x,y |
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| 41 | if x>10 and y>10: |
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| 42 | #print i,'Out region' |
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| 43 | elements_out.append(i) |
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| 44 | else: |
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| 45 | #print i,'In region' |
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| 46 | elements_in.append(i) |
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| 47 | |
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| 48 | #print elements_in |
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| 49 | #print elements_out |
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| 50 | |
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| 51 | points_in = {} |
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| 52 | for i in elements_in: |
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| 53 | #print i |
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| 54 | [v0,v1,v2] = elements[i] |
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| 55 | #print v0,v1,v2 |
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| 56 | points_in[v0] = v0 |
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| 57 | points_in[v1] = v1 |
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| 58 | points_in[v2] = v2 |
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| 59 | |
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| 60 | |
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| 61 | new_index = [] |
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| 62 | for i,value in enumerate(points_in): |
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| 63 | #print i , value |
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| 64 | points_in[value] = i |
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| 65 | |
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| 66 | |
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| 67 | #print points_in |
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| 68 | new_elements = [] |
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| 69 | for i in elements_in: |
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| 70 | #print i |
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| 71 | [v0,v1,v2] = elements[i] |
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| 72 | #print v0,v1,v2 |
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| 73 | |
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| 74 | nv0 = points_in[v0] |
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| 75 | nv1 = points_in[v1] |
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| 76 | nv2 = points_in[v2] |
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| 77 | |
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| 78 | new_elements.append([nv0,nv1,nv2]) |
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| 79 | |
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| 80 | new_points = [] |
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| 81 | for key,value in points_in.iteritems(): |
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| 82 | [x,y] = points[key] |
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| 83 | new_points.append([x,y]) |
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| 84 | |
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| 85 | #print new_points |
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| 86 | |
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| 87 | return new_points, new_elements |
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| 88 | |
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| 89 | |
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| 90 | |
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| 91 | |
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| 92 | |
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| 93 | |
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| 94 | |
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| 95 | #--------------------------------------- |
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| 96 | # Boundary conditions |
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| 97 | h0 = 1.0 |
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| 98 | h1 = 10.0 |
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| 99 | print 'Boundary conditions' |
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| 100 | |
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| 101 | #--------------------------------------- |
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| 102 | # Domain |
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| 103 | n = 100 |
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| 104 | m = 100 |
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| 105 | lenx = 20.0 |
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| 106 | leny = 20.0 |
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| 107 | delta_x = lenx/n |
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| 108 | delta_y = leny/m |
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| 109 | origin = (0.0, 0.0) |
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| 110 | |
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| 111 | points, elements, boundary = rectangular_cross(m, n, lenx, leny, origin) |
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| 112 | domain = Domain(points, elements, boundary) |
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| 113 | |
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| 114 | new_points, new_elements = cut_out_region(domain) |
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| 115 | domain = Domain(new_points, new_elements) |
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| 116 | |
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| 117 | |
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| 118 | R = Reflective_boundary(domain) |
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| 119 | T = Transmissive_boundary(domain) |
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| 120 | D = Dirichlet_boundary([h1, 0.0, 0.0]) |
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| 121 | domain.set_boundary({'exterior': R}) |
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| 122 | |
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| 123 | |
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| 124 | |
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| 125 | |
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| 126 | |
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| 127 | |
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| 128 | |
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| 129 | print "Number of triangles = ", len(domain) |
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| 130 | |
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| 131 | |
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| 132 | #--------------------------------------- |
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| 133 | #Initial condition |
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| 134 | p0 = [[0.0, 0.0], [10.0, 0.0], [10.0, 20.0], [0.0, 20.0]] |
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| 135 | domain.set_quantity('stage',Polygon_function([(p0,h1)],default = h0)) |
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| 136 | |
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| 137 | |
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| 138 | #--------------------------------------- |
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| 139 | # Provide file name for storing output |
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| 140 | domain.store = True |
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| 141 | domain.format = 'sww' |
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[3846] | 142 | domain.set_name('Non_symetrical_Dam_Break_second_order') |
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[2229] | 143 | |
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| 144 | |
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| 145 | # Visualization smoothing |
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| 146 | domain.visualise=True |
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| 147 | |
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| 148 | #--------------------------------------- |
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| 149 | #Decide which quantities are to be stored at each timestep |
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| 150 | domain.quantities_to_be_stored = ['stage', 'xmomentum', 'ymomentum'] |
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| 151 | |
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| 152 | |
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| 153 | #--------------------------------------- |
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| 154 | # Set bed elevation |
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| 155 | def x_slope(x,y): |
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| 156 | n = x.shape[0] |
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| 157 | z = 0*x |
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| 158 | return z |
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| 159 | domain.set_quantity('elevation', x_slope) |
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| 160 | |
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| 161 | |
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| 162 | #---------------------------- |
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| 163 | # Friction |
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| 164 | domain.set_quantity('friction', 0.0) |
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| 165 | |
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| 166 | |
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| 167 | #-------------------------------------- |
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| 168 | # Evolution |
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| 169 | |
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| 170 | yieldstep = 0.1 |
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| 171 | finaltime = 15.0 |
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| 172 | |
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| 173 | domain.CFL = 0.75 |
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| 174 | |
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| 175 | domain.default_order = 1 |
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| 176 | domain.smooth = True |
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| 177 | |
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| 178 | import time |
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| 179 | t0 = time.time() |
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| 180 | for t in domain.evolve(yieldstep = yieldstep, finaltime = finaltime): |
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| 181 | domain.write_time() |
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| 182 | |
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| 183 | print 'That took %.2f seconds' %(time.time()-t0) |
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