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Proceedings Paper

Site characterization through the use of computational fluid dynamics
Author(s): Konstantinos Vogiatzis; David S. De Young
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Paper Abstract

Numerical simulations of airflow over various potential sites for extremely large telescopes have been performed. Information such as wind speed, turbulence levels (fluctuating velocity RMS), wake lengths, boundary (ground) layer thickness and the effects of topographically induced turbulence on "seeing" can be retrieved, thus providing an essential evaluation tool in the site selection process. We present a sample set of simulations carried out over possible site locations for a 20-30m-telescope project. Simulations at several different sites located in Chile were performed in terms of wind speed levels and the effects of the local topographic features on the flow in the summit region, namely turbulent intensity and boundary layer thickness, under the prevailing wind conditions. Results indicate that the turbulent boundary layer thickness, defined as the region of considerable turbulent intensity levels, ranges from 10m to ~400m, depending on peak location and wind direction, for summit wind speeds varying between 4 and 12 m/s.

Paper Details

Date Published: 7 July 2004
PDF: 7 pages
Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); doi: 10.1117/12.566346
Show Author Affiliations
Konstantinos Vogiatzis, AURA New Initiatives Office (United States)
David S. De Young, National Optical Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 5382:
Second Backaskog Workshop on Extremely Large Telescopes
Arne L. Ardeberg; Torben Andersen, Editor(s)

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