NIO Workshop on Wind Modeling

1. NIO Workshop on Wind Modeling Welcome and Introduction Larry Stepp NIO Workshop on Wind Modeling

2. Agenda November 26 - morning 9:00 Welcome and introduction Larry Stepp 9:20 Gemini water tunnel testing Paul Gillett 9:40 The Gemini South wind loading study Myung Cho 10:10 Analysis of the Gemini data Oleg Likhatchev 10:50 Break 11:00 Previous CFD modeling of Gemini telescope and enclosure Dave DeYoung 11:30 Enclosures for Extremely Large Telescopes David Halliday 12:00 Lunch NIO Workshop on Wind Modeling

3. Agenda November 26 - afternoon 1:00 Wind modeling studies at TSU Dr. Xu and/or Mark Whorton 1:30 What do we need to know for GSMT? George Angeli 2:00 Discussion of what we have learned so far about telescope wind loading 3:00 Break 3:20 Discussion of next efforts 5:00 Adjourn 6:30 Dinner NIO Workshop on Wind Modeling

4. Agenda November 27 - morning 9:00 Planning session for additional studies 11:00 Establish action items 12:00 Adjourn Workshop Lunch NIO Workshop on Wind Modeling

5. Who we are Association of Universities for Research in Astronomy Space Telescope Science Institute National Solar Observatory National Optical Astronomy Observatory Gemini Observatory AURA New Initiatives Office NIO Workshop on Wind Modeling

6. NOAO • Operates telescopes on Kitt Peak, Arizona and Cerro Tololo and Cerro Pachon, Chile • Runs Time Allocation Committees that assign observing time to US Astronomers • Develops new facilities for ground-based astronomy NIO Workshop on Wind Modeling

7. Gemini • Gemini Observatory is an international partnership of 7 countries • United States • United Kingdom • Canada • Chile • Argentina • Brazil • Australia NIO Workshop on Wind Modeling

8. Gemini • There are two Gemini telescopes, each 8 meters in diameter • Mauna Kea, Hawai’i • Cerro Pachon, Chile NIO Workshop on Wind Modeling

9. Background • In the past, observatory domes were designed to shield the telescope from the wind as much as possible • However, massive domes with minimal ventilation trapped heat • Degraded seeing • Many telescopes of the current generation have vents to provide natural ventilation • Improved seeing • More concern about wind buffeting NIO Workshop on Wind Modeling

10. Background • Observatories are interested in wind modeling for two reasons: • Understand seeing effects • Understand wind buffeting • Many previous wind studies for existing telescopes were more concerned with seeing • Plans for future extremely large telescopes depend on understanding wind buffeting NIO Workshop on Wind Modeling

11. GSMT • NIO is developing design concepts for a 30-meter Giant Segmented Mirror Telescope • Wind buffeting will be a key issue NIO Workshop on Wind Modeling

12. Goals for the Workshop • Review previous wind flow studies of Gemini Telescopes • Evaluate what has already been learned • Identify key parameters involved in wind loading of telescopes • Identify further studies on Gemini Telescopes to increase our understanding of wind loading on larger telescopes • Set priorities for upcoming studies • Reach agreement on division of labor for studies NIO Workshop on Wind Modeling

13. Agenda November 26 - morning 9:00 Welcome and introduction Larry Stepp 9:20 Gemini water tunnel testing Paul Gillett 9:40 The Gemini South wind loading study Myung Cho 10:10 Analysis of the Gemini data Oleg Likhatchev 10:50 Break 11:00 Previous CFD modeling of Gemini telescope and enclosure Dave DeYoung 11:30 Enclosures for Extremely Large Telescopes David Halliday 12:00 Lunch NIO Workshop on Wind Modeling