## Lamb dipole in a domain with no-slip walls

*Details on the computation and presentation*
**Initialisation**
Dipole: velocity: U = 2; maximum initial vorticity 22.1
radius: a = 1
angle of dipole axis with X-axis: 0 degrees
position: centre of the domain (0,0)
Computation: domain: X = (-3, ..., 3), Y = (-3, ..., 3)
no. of grid points from wall to wall: (129, 129)
boundary conditions: no-slip 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 = 0.005
final time: T = 4.0 (*graphs*) and 7.5 (*movie*)
Tracers: *graphs:* along vorticity contours (i.e. along
streamlines) of the Lamb dipole at
vorticity level: 0.1; and single
tracers at each extremum
*movie:* none
**Notes**
- 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.
- The graphs are made on half resolution, *i.e.* only
1 in every 2 points.

<=== Lamb dipole in a domain with no-slip walls

**
Jos van Geffen** --
Home |
Site Map |
Contact Me

###### created: 12 December 1995

last modified: 26 May 2001