Initialisation 
Monopole:    consists actually of three stacked uniform monopoles,
             all centred around the origin and slightly elliptical:
             1) vorticity = -0.5,   radius in x,y = 1.0, 0.95
             2)           = +0.5,                 = 0.6, 0.57
             3)           = +1.981,               = 0.4, 0.38
             i.e. the eccentricity is 0.95
             (The value of the vorticity of the centre is such,
              that the total circulation equals zero.)
Tracers:     are placed on exactly the same ellipses as the edges
             of the vortices (with a minimum in points)
Computation: domain: X = (-5, ..., 5), Y = (-5, ..., 5)
             no. of grid points from wall to wall: (257, 257)
             boundary conditions: stress-free along all walls 
             standard Arakawa scheme used
             no rotation effects included
             no bottom topography
             viscosity: nu = 10^-4 (i.e. Re=10,000 at T=0)
             time step: dt = 0.1
             final time: T = 50 

<=== Formation of a tripolar vortex

 
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created: 16 February 1998
last modified: 26 May 2001