Abstract
We present results on the computational uid dynamics (CFD) numerical simulations as well as the wind tunnel experiments for the observation facilities of the University of Tokyo Atacama Observatory 6.5m Telescope being constructed at the summit of Co. Chajnantor in northern Chile. Main purpose of this study starting with the baseline design reported in 2014 is to analyze topographic effect on the wind behavior, and to evaluate the wind pressure, the air turbulence, and the air change (ventilation) efficiency in the enclosure. The wind velocity is found to be accelerated by a factor of ∼ 1.2 to reach the summit (78 m sec-1 expected at a maximum), and the resulting wind pressure (3,750 N m-2) is used for the framework design of the facilities. The CFD data reveals that the open space below the oor of the facilities works efficiently to drift away the air turbulence near the ground level which could significantly affect the dome seeing. From comparisons of the wind velocity field obtained from the CFD simulation for three configurations of the ventilation windows, we dind that the windows at a level of the telescope secondary mirror have less efficiency of the air change than those at lower levels. Considering the construction and maintenance costs, and operation procedures, we finally decide to allocate 13 windows at a level of the observing oor, 12 at a level of the primary mirror, and 2 at the level of the secondary mirror. The opening area by those windows accounts for about 14% of the total interior surface of the enclosure. Typical air change rate of 20{30 per hour is expected at the wind velocity of 1 m sec-1.
| Original language | English |
|---|---|
| Title of host publication | Ground-Based and Airborne Telescopes VI |
| Editors | Heather K. Marshall, Helen J. Hall, Roberto Gilmozzi |
| Publisher | SPIE |
| ISBN (Electronic) | 9781510601918 |
| DOIs | |
| Publication status | Published - Jan 1 2016 |
| Event | Ground-Based and Airborne Telescopes VI - Edinburgh, United Kingdom Duration: Jun 26 2016 → Jul 1 2016 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 9906 |
| ISSN (Print) | 0277-786X |
| ISSN (Electronic) | 1996-756X |
Other
| Other | Ground-Based and Airborne Telescopes VI |
|---|---|
| Country | United Kingdom |
| City | Edinburgh |
| Period | 6/26/16 → 7/1/16 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
The university of Tokyo atacama observatory 6.5m telescope : Enclosure design and wind analysis. / Konishi, Masahiro; Sako, Shigeyuki; Uchida, Takanori; Araya, Ryou; Kim, Koui; Yoshii, Yuzuru; Doi, Mamoru; Kohno, Kotaro; Miyata, Takashi; Motohara, Kentaro; Tanaka, Masuo; Minezaki, Takeo; Morokuma, Tomoki; Tamura, Yoichi; Tanabé, Toshihiko; Kato, Natsuko; Kamizuka, Takafumi; Takahashi, Hidenori; Aoki, Tsutomu; Soyano, Takao; Tarusawaf, Ken'ichi.
Ground-Based and Airborne Telescopes VI. ed. / Heather K. Marshall; Helen J. Hall; Roberto Gilmozzi. SPIE, 2016. 99062M (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9906).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - The university of Tokyo atacama observatory 6.5m telescope
T2 - Enclosure design and wind analysis
AU - Konishi, Masahiro
AU - Sako, Shigeyuki
AU - Uchida, Takanori
AU - Araya, Ryou
AU - Kim, Koui
AU - Yoshii, Yuzuru
AU - Doi, Mamoru
AU - Kohno, Kotaro
AU - Miyata, Takashi
AU - Motohara, Kentaro
AU - Tanaka, Masuo
AU - Minezaki, Takeo
AU - Morokuma, Tomoki
AU - Tamura, Yoichi
AU - Tanabé, Toshihiko
AU - Kato, Natsuko
AU - Kamizuka, Takafumi
AU - Takahashi, Hidenori
AU - Aoki, Tsutomu
AU - Soyano, Takao
AU - Tarusawaf, Ken'ichi
PY - 2016/1/1
Y1 - 2016/1/1
N2 - We present results on the computational uid dynamics (CFD) numerical simulations as well as the wind tunnel experiments for the observation facilities of the University of Tokyo Atacama Observatory 6.5m Telescope being constructed at the summit of Co. Chajnantor in northern Chile. Main purpose of this study starting with the baseline design reported in 2014 is to analyze topographic effect on the wind behavior, and to evaluate the wind pressure, the air turbulence, and the air change (ventilation) efficiency in the enclosure. The wind velocity is found to be accelerated by a factor of ∼ 1.2 to reach the summit (78 m sec-1 expected at a maximum), and the resulting wind pressure (3,750 N m-2) is used for the framework design of the facilities. The CFD data reveals that the open space below the oor of the facilities works efficiently to drift away the air turbulence near the ground level which could significantly affect the dome seeing. From comparisons of the wind velocity field obtained from the CFD simulation for three configurations of the ventilation windows, we dind that the windows at a level of the telescope secondary mirror have less efficiency of the air change than those at lower levels. Considering the construction and maintenance costs, and operation procedures, we finally decide to allocate 13 windows at a level of the observing oor, 12 at a level of the primary mirror, and 2 at the level of the secondary mirror. The opening area by those windows accounts for about 14% of the total interior surface of the enclosure. Typical air change rate of 20{30 per hour is expected at the wind velocity of 1 m sec-1.
AB - We present results on the computational uid dynamics (CFD) numerical simulations as well as the wind tunnel experiments for the observation facilities of the University of Tokyo Atacama Observatory 6.5m Telescope being constructed at the summit of Co. Chajnantor in northern Chile. Main purpose of this study starting with the baseline design reported in 2014 is to analyze topographic effect on the wind behavior, and to evaluate the wind pressure, the air turbulence, and the air change (ventilation) efficiency in the enclosure. The wind velocity is found to be accelerated by a factor of ∼ 1.2 to reach the summit (78 m sec-1 expected at a maximum), and the resulting wind pressure (3,750 N m-2) is used for the framework design of the facilities. The CFD data reveals that the open space below the oor of the facilities works efficiently to drift away the air turbulence near the ground level which could significantly affect the dome seeing. From comparisons of the wind velocity field obtained from the CFD simulation for three configurations of the ventilation windows, we dind that the windows at a level of the telescope secondary mirror have less efficiency of the air change than those at lower levels. Considering the construction and maintenance costs, and operation procedures, we finally decide to allocate 13 windows at a level of the observing oor, 12 at a level of the primary mirror, and 2 at the level of the secondary mirror. The opening area by those windows accounts for about 14% of the total interior surface of the enclosure. Typical air change rate of 20{30 per hour is expected at the wind velocity of 1 m sec-1.
UR - http://www.scopus.com/inward/record.url?scp=85001044594&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85001044594&partnerID=8YFLogxK
U2 - 10.1117/12.2231385
DO - 10.1117/12.2231385
M3 - Conference contribution
AN - SCOPUS:85001044594
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Ground-Based and Airborne Telescopes VI
A2 - Marshall, Heather K.
A2 - Hall, Helen J.
A2 - Gilmozzi, Roberto
PB - SPIE
ER -