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13.7  PASS: Rossby–Haurwitz wave

Author
Stéphane Popinet
Command
sh rossby.sh rossby.gfs
Version
120530
Required files
rossby.gfs (view) (download)
rossby.sh ehp.gfv ehm.gfv h.gfv href.gfv ec-6 eh-4.ref eh-5.ref eh-6.ref
Running time
15 minutes 54 seconds

Rossby–Haurwitz waves are analytic solutions of the non-linear barotropic vorticity equation on the sphere. The parameters for this test case are those proposed by Williamson et al [47].


Figure 184: Detail of height field after one complete revolution (24 days). Numerical solution in red and reference solution in green. (a) C16, (b) C32, (c) C64.
(a) (b)
(c)


Figure 185: Detail of relative error field after one complete revolution (24 days). Red is positive and green negative. 10 metres contour interval. (a) C16, (b) C32, (c) C64.
(a) (b)
(c)


Figure 186: Evolution of maximum relative error on height with time.


Figure 187: Convergence of final errors with spatial resolution.


Figure 188: Evolution of kinetic energy with time.

13.7.1  PASS: Rossby–Haurwitz wave with a free surface

Author
Stéphane Popinet
Command
sh ../rossby.sh ocean.gfs
Version
120614
Required files
ocean.gfs (view) (download)
ehp.gfv ehm.gfv h.gfv href.gfv ec-6 eh-4.ref eh-5.ref eh-6.ref
Running time
9 minutes 13 seconds

Same test case but using the GfsOcean solver implementing an implicit solution to the linearised shallow-water equations.

The initial transient (geostrophic adjustement) seems to be too strong.


Figure 189: Detail of height field after one complete revolution (24 days). Numerical solution in red and reference solution in green. (a) C16, (b) C32, (c) C64.
(a) (b)
(c)


Figure 190: Detail of relative error field after one complete revolution (24 days). Red is positive and green negative. 10 metres contour interval. (a) C16, (b) C32, (c) C64.
(a) (b)
(c)


Figure 191: Evolution of maximum relative error on height with time.


Figure 192: Convergence of final errors with spatial resolution.


Figure 193: Evolution of kinetic energy with time.

13.7.2  PASS: Rossby–Haurwitz wave with Saint-Venant

Author
Stéphane Popinet
Command
sh ../rossby.sh river.gfs
Version
120812
Required files
river.gfs (view) (download)
ehp.gfv ehm.gfv h.gfv href.gfv ec-6 eh-4.ref eh-5.ref eh-6.ref
Running time
18 minutes 15 seconds

Same test case but using the Saint-Venant solver.


Figure 194: Detail of height field after one complete revolution (24 days). Numerical solution in red and reference solution in green. (a) C16, (b) C32, (c) C64.
(a) (b)
(c)


Figure 195: Detail of relative error field after one complete revolution (24 days). Red is positive and green negative. 10 metres contour interval. (a) C16, (b) C32, (c) C64.
(a) (b)
(c)


Figure 196: Evolution of maximum relative error on height with time.


Figure 197: Convergence of final errors with spatial resolution.


Figure 198: Evolution of kinetic energy with time.


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