Initialisation 
Dipoles:     both dipoles:
                velocity: U = 2; maximum initial vorticity 22.1
                radius: a = 1  
             dipole 1:
                position: (-3.5,0)
                angle of dipole axis with X-axis: 0 degrees
             dipole 2:
                position: (0,+3.5)
                angle of dipole axis with X-axis: -90 degrees
Computation: domain: X = (-5, ..., 3), Y = (-5, ..., 5)
             no. of grid points from wall to wall: (129, 129)
             boundary conditions: stress-free along all walls 
             standard Arakawa scheme used
             no rotation effects included
             no bottom topography
             viscosity: nu = 10^-3 (i.e. Re=1000 at T=0)
             time step: dt = 0.01
             final time: T = 4
Tracers:     along vorticity contours (i.e. along streamlines) 
             of both Lamb dipoles at vorticity levels: 0.1, 6.0, 
             12.0, 18.0; and a single tracers at each extremum


Note
The tracer lines are not always smooth. The reason for this 
is that the representation of the lines by points is not always 
accurate enough. But since these tracers only passively follow 
the flow, this has no effect on the computations. 
It needs repair, though.

<=== Collision under 90 degrees of two Lamb dipoles

 
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created: 4 November 1996
last modified: 26 May 2001