Large-Eddy Simulation #47: 6.4 x 6.4 km Homogeneous CBL
LES RUN #47: 160 m HORIZONTAL, 50 m VERTICAL RESOLUTION. Domain size 40x40x60 grid-points.
Click here to see the NMSTASK file.
This domain is 6.4 km (east-west) by 6.4 km (north-south) wide.
This simulation the same as les#40 except new executable
and domain is 10 grid-points taller to prevent the entrainment zone
from bumping into the Rayleigh friction zone.
The MPEGs below are of the first two hours in the simulation. Many
small convective cells ( <1 km diameter) form within the first 40
minutes causing a sudden maximum in the total-TKE and a large positive
heat-flux (see first three figures after the MPEGs). After this event,
the cells broaden and the CBL gradually deepens. This result is
consistent with other LESs in Nieuwstadt et al. 1993. Play the MPEGs to
watch the evolution of this CBL.
Below here, I am posting turbulence statistics computed from LES#47
between 10 and 11 large-eddy turn-over times. Ideally, turbulence
statistics should be computed from as many large-eddy turn-over times
as possible in stationary MLs. However, since this ML is growing (we
call it quasi-stationary) and we wish to duplicate the Nieuwstadt et
al. results, we follow what they did as closely as possible.
UW Lidar // March 14, 1999 // firstname.lastname@example.org
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