Test C: Diffusion
- Domain and execution:
- 33x33x16 grid - runs quickly for interactive testing
- (note odd dimension
for nx,ny; bubble at exact X-Y center)
- ∆x=∆y=∆z = 500
meters
- ∆t = 1.0
seconds
- Physics:
- Diffusion of theta, only. Advection and PGF/buoyancy terms omitted.
- Diffusion
coefficient (for theta) is 50.0
- Initial condition:
- Theta: 1 thermal: -20˚, center (8250,8250,4250) meters (grid point 17,17,9); radius = 4000m in each direction x,y,z
- Boundary conditions:
- Usual (symmetric X, periodic Y, 0-gradient Z)
Test C: diffusion of theta
- Bubble placed at center at time T=0; run 2000 steps.
- It remains stationary but gradually weakens in
amplitude. See the text output
from the run.
| Test C | T=0 | T=500 | T=1000 | T=1500 | T=2000 |
|---|---|---|---|---|---|
| T X-Z j=17 |
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 |
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