Similarity statistics from a direct numerical simulation of the neutrally stratified planetary boundary layer
Coleman, G.N. (1999) Similarity statistics from a direct numerical simulation of the neutrally stratified planetary boundary layer. Journal of the Atmospheric Sciences, 56, (6), 891-900. (doi:10.1175/1520-0469(1999)056<0891:SSFADN>2.0.CO;2).
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Description/Abstract
The turbulent flow in the unstratified Ekman layer over a smooth surface for the case of no horizontal rotation
has been simulated. All relevant scales of motion are resolved so that no subgrid-scale parameterization is
needed. The Reynolds number Re, while much smaller than those found in the atmosphere, is large enough that
the flow exhibits a distinct logarithmic surface layer and yields shear-stress statistics that, to a good approximation,
satisfy Reynolds number similarity. Agreement with shear-stress profiles from large eddy simulations is good,
especially when latitude and geostrophic wind direction are taken into account. Results are used to estimate the
ratio of the boundary layer depth to the Ekman scale u
*
/ f and the similarity constants needed to determine the
geostrophic drag coefficient u
*
/G and surface-stress angle a0 in the Re →∞ limit characteristic of the neutral
planetary boundary layer
| Item Type: | Article |
|---|---|
| ISSNs: | 1520-0469 (print) |
| Related URLs: | |
| Subjects: | Q Science > Q Science (General) |
| Divisions: | University Structure - Pre August 2011 > School of Engineering Sciences |
| Item ID: | 71963 |
| Date Deposited: | 13 Jan 2010 |
| Last Modified: | 01 Jun 2011 00:51 |
| Contributors: | Coleman, G.N. (Author) |
| Date: | March 1999 |
| Status: | Published |
| Contact Email Address: | g.n.coleman@soton.ac.uk |
| URI: | http://eprints.soton.ac.uk/id/eprint/71963 |
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