Description
This
test case is provided for you to check your code before
running the assigned problem and configuration for
Computer Problem 5.Please note the settings below, and remember to change all settings back to the official problem(s) before running and handing in results.
- This is an advection test (only), for theta
- Grid layout: 201x41; ∆x=∆z=100 meters
- Potential temperature perturbation radius (x,z) = 4000, 1000
- Quasi-compressible sound speed Cs = 100 meters/sec
- Integration: time step ∆t = 0.25 sec
- You will disable
diffusion and pressure gradient/buoyancy forces for
these tests.
- Some tests here used Lax-Wendroff;
the upper-right moving case also has piecewise
linear (non-monotonic) results.
- Up/Right test
- U = +30, W = +5 everywhere.
- Put +25K temperature perturbation at (x,y) = (10050, 2050).
- Run 800 steps, plotting every 200.
- Down/Left test
- Same as above but U = -30, W = -5 everywhere.
Test case results
- Plots below use contour intervals of 2.0 (for U and W), 1.0 (for Theta'), and 25.0 (for P').
| Pgm
#5 test case C |
T=0 | T=50 | T=100 | T=150 | T=200 | |
|---|---|---|---|---|---|---|
| N=0 | N=200 | N=400 | N=600 | N=800 | ||
| Advection Up/Right Lax-Wendroff |
T |  |
 |
 |
 |
 |
| Advection Up/Right Piecewise-linear non-monotonic |
T |  |
 |
 |
 |
 |
| Pgm
#5 test case C |
T=0 | T=50 | T=100 | T=150 | T=200 | |
| N=0 | N=200 | N=400 | N=600 | N=800 | ||
| Advection Down/Left |
T |  |
 |
 |
 |
 |