| 1 | """Simple water flow example using ANUGA |
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| 2 | |
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| 3 | Water flowing down a channel with changing boundary conditions |
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| 4 | """ |
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| 5 | |
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| 6 | #------------------------------------------------------------------------------ |
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| 7 | # Import necessary modules |
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| 8 | #------------------------------------------------------------------------------ |
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| 9 | import anuga |
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| 10 | |
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| 11 | #------------------------------------------------------------------------------ |
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| 12 | # Setup computational domain |
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| 13 | #------------------------------------------------------------------------------ |
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| 14 | length = 10. |
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| 15 | width = 5. |
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| 16 | dx = dy = 1. # Resolution: Length of subdivisions on both axes |
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| 17 | |
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| 18 | points, vertices, boundary = anuga.rectangular_cross(int(length/dx), |
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| 19 | int(width/dy), len1=length, len2=width) |
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| 20 | |
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| 21 | domain = anuga.Domain(points, vertices, boundary) |
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| 22 | domain.set_name('channel2') # Output name |
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| 23 | |
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| 24 | #------------------------------------------------------------------------------ |
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| 25 | # Setup initial conditions |
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| 26 | #------------------------------------------------------------------------------ |
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| 27 | def topography(x,y): |
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| 28 | return -x/10 # linear bed slope |
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| 29 | |
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| 30 | domain.set_quantity('elevation', topography) # Use function for elevation |
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| 31 | domain.set_quantity('friction', 0.01) # Constant friction |
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| 32 | domain.set_quantity('stage', |
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| 33 | expression='elevation') # Dry initial condition |
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| 34 | |
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| 35 | #------------------------------------------------------------------------------ |
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| 36 | # Setup boundary conditions |
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| 37 | #------------------------------------------------------------------------------ |
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| 38 | Bi = anuga.Dirichlet_boundary([0.4, 0, 0]) # Inflow |
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| 39 | Br = anuga.Reflective_boundary(domain) # Solid reflective wall |
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| 40 | Bo = anuga.Dirichlet_boundary([-5, 0, 0]) # Outflow |
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| 41 | |
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| 42 | domain.set_boundary({'left': Bi, 'right': Br, 'top': Br, 'bottom': Br}) |
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| 43 | |
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| 44 | #------------------------------------------------------------------------------ |
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| 45 | # Evolve system through time |
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| 46 | #------------------------------------------------------------------------------ |
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| 47 | for t in domain.evolve(yieldstep=0.2, finaltime=40.0): |
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| 48 | print domain.timestepping_statistics() |
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| 49 | |
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| 50 | if domain.get_quantity('stage').\ |
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| 51 | get_values(interpolation_points=[[10, 2.5]]) > 0: |
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| 52 | print 'Stage > 0: Changing to outflow boundary' |
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| 53 | domain.set_boundary({'right': Bo}) |
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| 54 | |
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