"""Simple water flow example using ANUGA Water flowing down a channel with changing boundary conditions """ #------------------------------------------------------------------------------ # Import necessary modules #------------------------------------------------------------------------------ import anuga #------------------------------------------------------------------------------ # Setup computational domain #------------------------------------------------------------------------------ length = 10. width = 5. dx = dy = 1. # Resolution: Length of subdivisions on both axes points, vertices, boundary = anuga.rectangular_cross(int(length/dx), int(width/dy), len1=length, len2=width) domain = anuga.Domain(points, vertices, boundary) domain.set_name('channel2') # Output name #------------------------------------------------------------------------------ # Setup initial conditions #------------------------------------------------------------------------------ def topography(x,y): return -x/10 # linear bed slope domain.set_quantity('elevation', topography) # Use function for elevation domain.set_quantity('friction', 0.01) # Constant friction domain.set_quantity('stage', expression='elevation') # Dry initial condition #------------------------------------------------------------------------------ # Setup boundary conditions #------------------------------------------------------------------------------ Bi = anuga.Dirichlet_boundary([0.4, 0, 0]) # Inflow Br = anuga.Reflective_boundary(domain) # Solid reflective wall Bo = anuga.Dirichlet_boundary([-5, 0, 0]) # Outflow domain.set_boundary({'left': Bi, 'right': Br, 'top': Br, 'bottom': Br}) #------------------------------------------------------------------------------ # Evolve system through time #------------------------------------------------------------------------------ for t in domain.evolve(yieldstep=0.2, finaltime=40.0): print domain.timestepping_statistics() if domain.get_quantity('stage').\ get_values(interpolation_points=[[10, 2.5]]) > 0: print 'Stage > 0: Changing to outflow boundary' domain.set_boundary({'right': Bo})